Finding length

[webmasts]

Hi,

I'm creating a palindrome program. So far, I got that part. Now, I need to find out if the length of the integer (string) is less than 5 digits. If the length is less than 5, then don't proceed with the program. Please give your suggestions. Basically, what I'm doing is converting the Int to String and then finding the length. Thanks!

I tried the following:

if ( s.length() >= 5 ) {
// Proceed
}

and got this:

Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at _uesJavaRun.main(_uesJavaRun.java:29)
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: 4
at java.lang.String.charAt(String.java:558)
at palindrome.main(palindrome.java:26)
... 5 more

This is my code so far:

import java.util.Scanner;

public class palindrome
{
public static void main (String args[])
{

Scanner input = new Scanner (System.in );
int number;
String len, size;

System.out.print( "Enter a 5-digit integer: " );
number = input.nextInt();

len = number + "";

// print error message if the length is less than 5 digits

System.out.println ("Your input is not a 5-digit long. Try again.");

}
}

[masijade]

try this

if (Math.abs(number / 10) < 1000) {
  error message
}

since a five digit number will be at least 10000 or -10000

probably a little quicker than converting to string and evaluating
its length as well.

[iamthwee]

I don't have that scanner thing. I use these two classes to handle input from the command line.

Pedantic.java

public class Pedantic
{
    public static void main (String args[])
   {

    //Scanner input = new Scanner (System.in );
    
    String input;
    System.out.println("Please enter a five-digit integer");
    input = TextIO.getWord();
    
    if(input.length()>=5)
    {
        System.out.println("woot woot tis ok");
    }
    else

   System.out.println ("Your input is not a 5-digit long. Try again.");

    }
}

TextIO.java

/*
    The file defines a class TextIO, which provides a simple interface
    to Java's standard console input and output.  This class defines
    several static methhods for reading and writing
    values of various type.
    
    This class will only work with standard, interactive applications.
    When it is used in such an application, System.out and System.in
    should not be used directly, since the TextIO class thinks it has
    exclusive control of System.out and System.in.  (Actually, using
    System.out will probably not cause any problems, but don't use
    System.in.)

    To use this class in your program, simply include the compiled class
    file TextIO.class in the same directory with the class file for your
    main program.  (If you are using a development environment such as
    CodeWarrior or Visual J++, you can include the source file,
    TextIO.java in your project.)  You can then use all the public static methods
    from the TextIO class in your program.  (In your programs, the names
    of the methods must be prefaced with "TextIO."  For example, you should
    use the name TextIO.getln() rather than simply getln().)

    (This class is for use with my on-line introductory java textbook,
    which is available at http://math.hws.edu/eck/cs124/notes/index.html.)

    Written by:  David Eck
                 Department of Mathematics and Computer Science
                 Hobart and William Smith Colleges
                 Geneva, NY 14456
                 Email:  [e-mail]
                 WWW:  http://math.hws.edu/eck/

    July 16, 1998
    
    Modified February, 2000; getChar() now skips blanks and CR's, and getAnyChar() 
    can be used to read the next char even if it's a blank or CR.

*/

import java.io.*;
   
public class TextIO {

   // *************************** I/O Methods *********************************
   
         // Methods for writing the primitive types, plus type String,
         // to the console, with no extra spaces.
         //
         // Note that the real-number data types, float
         // and double, a rounded version is output that will
         // use at most 10 or 11 characters.  If you want to
         // output a real number with full accuracy, use
         // "TextIO.put(String.valueOf(x))", for example.
         
   public static void put(int x)     { put(x,0); }   // Note: also handles byte and short!
   public static void put(long x)    { put(x,0); }
   public static void put(double x)  { put(x,0); }   // Also handles float.
   public static void put(char x)    { put(x,0); }
   public static void put(boolean x) { put(x,0); }
   public static void put(String x)  { put(x,0); }


         // Methods for writing the primitive types, plus type String,
         // to the console,followed by a carriage return, with
         // no extra spaces.

   public static void putln(int x)      { put(x,0); newLine(); }  // Note: also handles byte and short!
   public static void putln(long x)     { put(x,0); newLine(); }
   public static void putln(double x)   { put(x,0); newLine(); }  // Also handles float.
   public static void putln(char x)     { put(x,0); newLine(); }
   public static void putln(boolean x)  { put(x,0); newLine(); }
   public static void putln(String x)   { put(x,0); newLine(); }
  

         // Methods for writing the primitive types, plus type String,
         // to the console, with a minimum field width of w,
         // and followed by a carriage  return.
         // If output value is less than w characters, it is padded
         // with extra spaces in front of the value.

   public static void putln(int x, int w)     { put(x,w); newLine(); }   // Note: also handles byte and short!
   public static void putln(long x, int w)    { put(x,w); newLine(); }
   public static void putln(double x, int w)  { put(x,w); newLine(); }   // Also handles float.
   public static void putln(char x, int w)    { put(x,w); newLine(); }
   public static void putln(boolean x, int w) { put(x,w); newLine(); }
   public static void putln(String x, int w)  { put(x,w); newLine(); }


          // Method for outputting a carriage return

   public static void putln() { newLine(); }
   

         // Methods for writing the primitive types, plus type String,
         // to the console, with minimum field width w.
   
   public static void put(int x, int w)     { dumpString(String.valueOf(x), w); }   // Note: also handles byte and short!
   public static void put(long x, int w)    { dumpString(String.valueOf(x), w); }
   public static void put(double x, int w)  { dumpString(realToString(x), w); }     // Also handles float.
   public static void put(char x, int w)    { dumpString(String.valueOf(x), w); }
   public static void put(boolean x, int w) { dumpString(String.valueOf(x), w); }
   public static void put(String x, int w)  { dumpString(x, w); }
   
   
         // Methods for reading in the primitive types, plus "words" and "lines".
         // The "getln..." methods discard any extra input, up to and including
         //    the next carriage return.
         // A "word" read by getlnWord() is any sequence of non-blank characters.
         // A "line" read by getlnString() or getln() is everything up to next CR;
         //    the carriage return is not part of the returned value, but it is
         //    read and discarded.
         // Note that all input methods except getAnyChar(), peek(), the ones for lines
         //    skip past any blanks and carriage returns to find a non-blank value.
         // getln() can return an empty string; getChar() and getlnChar() can 
         //    return a space or a linefeed ('\n') character.
         // peek() allows you to look at the next character in input, without
         //    removing it from the input stream.  (Note that using this
         //    routine might force the user to enter a line, in order to
         //    check what the next character is.)
         // Acceptable boolean values are the "words": true, false, t, f, yes,
         //    no, y, n, 0, or 1;  uppercase letters are OK.
         // None of these can produce an error; if an error is found in input,
         //    the user is forced to re-enter.
         // Available input routines are:
         //
         //            getByte()      getlnByte()    getShort()     getlnShort()
         //            getInt()       getlnInt()     getLong()      getlnLong()
         //            getFloat()     getlnFloat()   getDouble()    getlnDouble()
         //            getChar()      getlnChar()    peek()         getAnyChar()
         //            getWord()      getlnWord()    getln()        getString()    getlnString()
         //
         // (getlnString is the same as getln and is onlyprovided for consistency.)
   
   public static byte getlnByte()       { byte x=getByte();       emptyBuffer();  return x; }
   public static short getlnShort()     { short x=getShort();     emptyBuffer();  return x; }
   public static int getlnInt()         { int x=getInt();         emptyBuffer();  return x; }
   public static long getlnLong()       { long x=getLong();       emptyBuffer();  return x; }
   public static float getlnFloat()     { float x=getFloat();     emptyBuffer();  return x; }
   public static double getlnDouble()   { double x=getDouble();   emptyBuffer();  return x; }
   public static char getlnChar()       { char x=getChar();       emptyBuffer();  return x; }
   public static boolean getlnBoolean() { boolean x=getBoolean(); emptyBuffer();  return x; }
   public static String getlnWord()     { String x=getWord();     emptyBuffer();  return x; }
   public static String getlnString()   { return getln(); }  // same as getln()
   public static String getln() {
      StringBuffer s = new StringBuffer(100);
      char ch = readChar();
      while (ch != '\n') {
         s.append(ch);
         ch = readChar();
      }
      return s.toString();
   }
   
   
   public static byte getByte()   { return (byte)readInteger(-128L,127L); }
   public static short getShort() { return (short)readInteger(-32768L,32767L); }   
   public static int getInt()     { return (int)readInteger((long)Integer.MIN_VALUE, (long)Integer.MAX_VALUE); }
   public static long getLong()   { return readInteger(Long.MIN_VALUE, Long.MAX_VALUE); }
   
   public static char getAnyChar(){ return readChar(); }
   public static char peek()      { return lookChar(); }
   
   public static char getChar() {  // skip spaces & cr's, then return next char
      char ch = lookChar();
      while (ch == ' ' || ch == '\n') {
         readChar();
         if (ch == '\n')
            dumpString("? ",0);
         ch = lookChar();
      }
      return readChar();
   }

   public static float getFloat() {
      float x = 0.0F;
      while (true) {
         String str = readRealString();
         if (str.equals("")) {
             errorMessage("Illegal floating point input.",
                          "Real number in the range " + Float.MIN_VALUE + " to " + Float.MAX_VALUE);
         }
         else {
            Float f = null;
            try { f = Float.valueOf(str); }
            catch (NumberFormatException e) {
               errorMessage("Illegal floating point input.",
                            "Real number in the range " + Float.MIN_VALUE + " to " + Float.MAX_VALUE);
               continue;
            }
            if (f.isInfinite()) {
               errorMessage("Floating point input outside of legal range.",
                            "Real number in the range " + Float.MIN_VALUE + " to " + Float.MAX_VALUE);
               continue;
            }
            x = f.floatValue();
            break;
         }
      }
      return x;
   }
   
   public static double getDouble() {
      double x = 0.0;
      while (true) {
         String str = readRealString();
         if (str.equals("")) {
             errorMessage("Illegal floating point input",
                          "Real number in the range " + Double.MIN_VALUE + " to " + Double.MAX_VALUE);
         }
         else {
            Double f = null;
            try { f = Double.valueOf(str); }
            catch (NumberFormatException e) {
               errorMessage("Illegal floating point input",
                            "Real number in the range " + Double.MIN_VALUE + " to " + Double.MAX_VALUE);
               continue;
            }
            if (f.isInfinite()) {
               errorMessage("Floating point input outside of legal range.",
                            "Real number in the range " + Double.MIN_VALUE + " to " + Double.MAX_VALUE);
               continue;
            }
            x = f.doubleValue();
            break;
         }
      }
      return x;
   }
   
   public static String getWord() {
      char ch = lookChar();
      while (ch == ' ' || ch == '\n') {
         readChar();
         if (ch == '\n')
            dumpString("? ",0);
         ch = lookChar();
      }
      StringBuffer str = new StringBuffer(50);
      while (ch != ' ' && ch != '\n') {
         str.append(readChar());
         ch = lookChar();
      }
      return str.toString();
   }
   
   public static boolean getBoolean() {
      boolean ans = false;
      while (true) {
         String s = getWord();
         if ( s.equalsIgnoreCase("true") || s.equalsIgnoreCase("t") ||
                 s.equalsIgnoreCase("yes")  || s.equalsIgnoreCase("y") ||
                 s.equals("1") ) {
              ans = true;
              break;
          }
          else if ( s.equalsIgnoreCase("false") || s.equalsIgnoreCase("f") ||
                 s.equalsIgnoreCase("no")  || s.equalsIgnoreCase("n") ||
                 s.equals("0") ) {
              ans = false;
              break;
          }
          else
             errorMessage("Illegal boolean input value.",
                          "one of:  true, false, t, f, yes, no, y, n, 0, or 1");
      }
      return ans;
   }
   
   // ***************** Everything beyond this point is private *******************
   
   // ********************** Utility routines for input/output ********************

   private static InputStream in = System.in;    // rename standard input stream
   private static PrintStream out = System.out;  // rename standard output stream

   private static String buffer = null;  // one line read from input
   private static int pos = 0;           // position of next char in input line that has
                                         //      not yet been processed


   private static String readRealString() {   // read chars from input following syntax of real numbers
      StringBuffer s=new StringBuffer(50);
      char ch=lookChar();
      while (ch == ' ' || ch == '\n') {
          readChar();
          if (ch == '\n')
             dumpString("? ",0);
          ch = lookChar();
      }
      if (ch == '-' || ch == '+') {
          s.append(readChar());
          ch = lookChar();
          while (ch == ' ') {
             readChar();
             ch = lookChar();
          }
      }
      while (ch >= '0' && ch <= '9') {
          s.append(readChar());
          ch = lookChar();
      }
      if (ch == '.') {
         s.append(readChar());
         ch = lookChar();
         while (ch >= '0' && ch <= '9') {
             s.append(readChar());
             ch = lookChar();
         }
      }
      if (ch == 'E' || ch == 'e') {
         s.append(readChar());
         ch = lookChar();
         if (ch == '-' || ch == '+') {
             s.append(readChar());
             ch = lookChar();
         }
         while (ch >= '0' && ch <= '9') {
             s.append(readChar());
             ch = lookChar();
         }
      }
      return s.toString();
   }

   private static long readInteger(long min, long max) {  // read long integer, limited to specified range
      long x=0;
      while (true) {
         StringBuffer s=new StringBuffer(34);
         char ch=lookChar();
         while (ch == ' ' || ch == '\n') {
             readChar();
             if (ch == '\n');
                dumpString("? ",0);
             ch = lookChar();
         }
         if (ch == '-' || ch == '+') {
             s.append(readChar());
             ch = lookChar();
             while (ch == ' ') {
                readChar();
                ch = lookChar();
             }
         }
         while (ch >= '0' && ch <= '9') {
             s.append(readChar());
             ch = lookChar();
         }
         if (s.equals("")){
             errorMessage("Illegal integer input.",
                          "Integer in the range " + min + " to " + max);
         }
         else {
             String str = s.toString();
             try { 
                x = Long.parseLong(str);
             }
             catch (NumberFormatException e) {
                errorMessage("Illegal integer input.",
                             "Integer in the range " + min + " to " + max);
                continue;
             }
             if (x < min || x > max) {
                errorMessage("Integer input outside of legal range.",
                             "Integer in the range " + min + " to " + max);
                continue;
             }
             break;
         }
      }
      return x;
   }
   
   private static String realToString(double x) {
         // Goal is to get a reasonable representation of x in at most
         // 10 characters, or 11 characters if x is negative.
      if (Double.isNaN(x))
         return "undefined";
      if (Double.isInfinite(x))
         if (x < 0)
            return "-INF";
         else
            return "INF";
      if (Math.abs(x) <= 5000000000.0 && Math.rint(x) == x)
         return String.valueOf( (long)x );
      String s = String.valueOf(x);
      if (s.length() <= 10)
         return s;
      boolean neg = false;
      if (x < 0) {
         neg = true;
         x = -x;
         s = String.valueOf(x);
      }
      if (x >= 0.00005 && x <= 50000000 && (s.indexOf('E') == -1 && s.indexOf('e') == -1)) {  // trim x to 10 chars max
         s = round(s,10);
         s = trimZeros(s);
      }
      else if (x > 1) { // construct exponential form with positive exponent
          long power = (long)Math.floor(Math.log(x)/Math.log(10));
          String exp = "E" + power;
          int numlength = 10 - exp.length();
          x = x / Math.pow(10,power);
          s = String.valueOf(x);
          s = round(s,numlength);
          s = trimZeros(s);
          s += exp;
      }
      else { // constuct exponential form
          long power = (long)Math.ceil(-Math.log(x)/Math.log(10));
          String exp = "E-" + power;
          int numlength = 10 - exp.length();
          x = x * Math.pow(10,power);
          s = String.valueOf(x);
          s = round(s,numlength);
          s = trimZeros(s);
          s += exp;
      }
      if (neg)
         return "-" + s;
      else
         return s;
   }
   
   private static String trimZeros(String num) {  // used by realToString
     if (num.indexOf('.') >= 0 && num.charAt(num.length() - 1) == '0') {
        int i = num.length() - 1;
        while (num.charAt(i) == '0')
           i--;
        if (num.charAt(i) == '.')
           num = num.substring(0,i);
        else
           num = num.substring(0,i+1);
     }
     return num;
   }
   
   private static String round(String num, int length) {  // used by realToString
      if (num.indexOf('.') < 0)
         return num;
      if (num.length() <= length)
         return num;
      if (num.charAt(length) >= '5' && num.charAt(length) != '.') {
         char[] temp = new char[length+1];
         int ct = length;
         boolean rounding = true;
         for (int i = length-1; i >= 0; i--) {
            temp[ct] = num.charAt(i); 
            if (rounding && temp[ct] != '.') {
               if (temp[ct] < '9') {
                  temp[ct]++;
                  rounding = false;
               }
               else
                  temp[ct] = '0';
            }
            ct--;
         }
         if (rounding) {
            temp[ct] = '1';
            ct--;
         }
         // ct is -1 or 0
         return new String(temp,ct+1,length-ct);
      }
      else 
         return num.substring(0,length);
      
   }
   private static void dumpString(String str, int w) {   // output string to console
      for (int i=str.length(); i<w; i++)
         out.print(' ');
      for (int i=0; i<str.length(); i++)
         if ((int)str.charAt(i) >= 0x20 && (int)str.charAt(i) != 0x7F)  // no control chars or delete
            out.print(str.charAt(i));
         else if (str.charAt(i) == '\n' || str.charAt(i) == '\r')
            newLine();
   }
   
   private static void errorMessage(String message, String expecting) {
                  // inform user of error and force user to re-enter.
       newLine();
       dumpString("  *** Error in input: " + message + "\n", 0);
       dumpString("  *** Expecting: " + expecting + "\n", 0);
       dumpString("  *** Discarding Input: ", 0);
       if (lookChar() == '\n')
          dumpString("(end-of-line)\n\n",0);
       else {
          while (lookChar() != '\n')
             out.print(readChar());
          dumpString("\n\n",0);
       }
       dumpString("Please re-enter: ", 0);
       readChar();  // discard the end-of-line character
   }

   private static char lookChar() {  // return next character from input
      if (buffer == null || pos > buffer.length())
         fillBuffer();
      if (pos == buffer.length())
         return '\n';
      return buffer.charAt(pos);
   }

   private static char readChar() {  // return and discard next character from input
      char ch = lookChar();
      pos++;
      return ch;
   }

   private static void newLine() {   // output a CR to console
      out.println();
      out.flush();
   }

   private static boolean possibleLinefeedPending = false;

   private static void fillBuffer() {    // Wait for user to type a line and press return,
                                         // and put the typed line into the buffer.
      StringBuffer b = new StringBuffer();
      out.flush();
      try {
         int ch = in.read();
         if (ch == '\n' && possibleLinefeedPending)
            ch = in.read();
         possibleLinefeedPending = false;
         while (ch != -1 && ch != '\n' && ch != '\r') {
             b.append((char)ch);
             ch = in.read();
         }
         possibleLinefeedPending = (ch == '\r');
         if (ch == -1) {
            System.out.println("\n*** Found an end-of-file while trying to read from standard input!");
            System.out.println("*** Maybe your Java system doesn't implement standard input?");
            System.out.println("*** Program will be terminated.\n");
            throw new RuntimeException("End-of-file on standard input.");
         }
      }
      catch (IOException e) {
         System.out.println("Unexpected system error on input.");
         System.out.println("Terminating program.");
         System.exit(1);
      }
      buffer = b.toString();
      pos = 0;
   }

   private static void emptyBuffer() {   // discard the rest of the current line of input
      buffer = null;
   }
   
   
} // end of class Console

[edit] sorry I didn't realise you were using integers instead of strings[/edit]

[webmasts]

try this

if (Math.abs(number / 10) < 1000) {
  error message
}

since a five digit number will be at least 10000 or -10000

probably a little quicker than converting to string and evaluating
its length as well.

Whenever there is less than 5 digits, I'm still getting the following message:

Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at _uesJavaRun.main(_uesJavaRun.java:29)
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: 4
at java.lang.String.charAt(String.java:558)
at palindrome.main(palindrome.java:26)
... 5 more

What am I doing wrong?

[iamthwee]

Can you get this basic program to compile and execute properly?

class Salut{
       public static void main(String[] args){
       String greeting = "salut monde";
       System.out.println(greeting);
       }
}

If not you probably have your paths set up incorrectly. If this is the case check out the read_me files that came with whatever IDE you are using. Gotta Walk before you can run.

[webmasts]

Can you get this basic program to compile and execute properly?

class Salut{
       public static void main(String[] args){
       String greeting = "salut monde";
       System.out.println(greeting);
       }
}

If not you probably have your paths set up incorrectly. If this is the case check out the read_me files that came with whatever IDE you are using. Gotta Walk before you can run.

Yeah, it's working. Someone gave me a tip on using the % and / to compare the length. Any example? Thanks!

[iamthwee]

Yeah, it's working. Someone gave me a tip on using the % and / to compare the length. Any example? Thanks!

You're definitely on the right lines however, it is difficult to explain without providing a complete solution. Try it yourself kiddo, then come back wen u have sum sudo code or something.

[server_crash]

Why are you worrying about finding the length when it's still an integer? Convert it to a string. You'll have to do so sooner or later until you decide to do it some hard way:

StringBuffer sb =  new StringBuffer(string);
newstring = sb.reverse();

if (string.equals(newstring) )
{
   //palindrome
}

all the code you need.

[iamthwee]

>all the code you need.

No I don't think so. I think the purpose of his assignment is to think of a way to check if an integer is a palindrome using the modulus and division operators.

I don't think he is even allowed to convert it to strings. He is just confused as to how to ascertain how many digits there are in a given integer... and is going down the string.length() avenue because he doesn't know any better.

Here's a hint to find out how many digits are in an integer:

>keep dividing the integer by ten until it gets to zero, each time incrementing a counter.

[server_crash]

No, it's all the code you need. At least I wouldn't need to do anymore. Of course it's like you said, it probably wasn't his assignment.

[webmasts]

>all the code you need.

No I don't think so. I think the purpose of his assignment is to think of a way to check if an integer is a palindrome using the modulus and division operators.

I don't think he is even allowed to convert it to strings. He is just confused as to how to ascertain how many digits there are in a given integer... and is going down the string.length() avenue because he doesn't know any better.

Here's a hint to find out how many digits are in an integer:

>keep dividing the integer by ten until it gets to zero, each time incrementing a counter.

Here's my complete code, tell me what I'm missing here. By the way, I'm new to Java and nothing is taught about it in the comp sci class:

import java.util.Scanner;

public class palindrome
{
  public static void main (String args[])
  {

    Scanner input = new Scanner (System.in );
    int number;
    String len;
    char pos1, pos2, pos3, pos4, pos5;

    System.out.print( "Enter a 5-digit integer:  " );
      number = input.nextInt();

   len = number + "";

   pos1 = len.charAt(0);
   pos2 = len.charAt(1);
   pos3 = len.charAt(2);
   pos4 = len.charAt(3);
   pos5 = len.charAt(4);

// print error message if the length is less than 5 digits

   System.out.println ("Your input is not 5-digit long. Try again.");

// now print the result

  if (pos1 == pos5 && pos2 == pos4 )
    System.out.println ( "We have a palindrome!" );
  else
    System.out.println (" Oops! We don\'t have a palindrome.");

  }
}

[iamthwee]

Here's my complete code, tell me what I'm missing here. By the way, I'm new to Java and nothing is taught about it in the comp sci class:

import java.util.Scanner;

public class palindrome
{
  public static void main (String args[])
  {

    Scanner input = new Scanner (System.in );
    int number;
    String len;
    char pos1, pos2, pos3, pos4, pos5;

    System.out.print( "Enter a 5-digit integer:  " );
      number = input.nextInt();

   len = number + "";

   pos1 = len.charAt(0);
   pos2 = len.charAt(1);
   pos3 = len.charAt(2);
   pos4 = len.charAt(3);
   pos5 = len.charAt(4);

// print error message if the length is less than 5 digits

   System.out.println ("Your input is not 5-digit long. Try again.");

// now print the result

  if (pos1 == pos5 && pos2 == pos4 )
    System.out.println ( "We have a palindrome!" );
  else
    System.out.println (" Oops! We don\'t have a palindrome.");

  }
}

Ok one question, are you allowed to use strings, like the example server_crash showed you, or do you have to do this using integers only?

Better ask your teacher, because I don't think he would have given you the hint of using % and / operators if you could do this with just strings? Once you've checked I'll show you what you're doing wrong.

[webmasts]

Ok one question, are you allowed to use strings, like the example server_crash showed you, or do you have to do this using integers only?

Better ask your teacher, because I don't think he would have given you the hint of using % and / operators if you could do this with just strings? Once you've checked I'll show you what you're doing wrong.

My instructor didn't mention what to use. Just do it! But, he did give hint as to use % and /

[server_crash]

If he didn't say how to do it, then why not use my two liner?

[iamthwee]

>My instructor didn't mention what to use

Well freakin ask him/her... :rolleyes:

I'd wager you're not allowed to uses strings...Hmmm.