Hi, I'm trying to write a java program that will read in the scanner input from a user and outputs an postfix expression and answer
so if you typed in:
A = 5
B = 7
$PART2
AB+
the output would be
AB+ = 12
I'm having trouble with the scanner input I can make it so a user
can enter a letter and a number, but I'm having trouble trying to make the program shift so when the user enters $PART2 it will then begin to read in the post fix expressions.
If anyone could help I would greatly appreciate it.
import java.util.*;
import java.io.*;
import java.util.Scanner;
import java.util.Stack;
public class PostEval
{
static public void main(String args[])
{
Scanner scanner = new Scanner(System.in);
Stack<String> postFix = new Stack<String>();
String part2 = "$PART2";
System.out.println("Input Letter and Number it equals: ");
while(scanner.hasNext())
{
String letter = scanner.next();
char equals=(scanner.next()).charAt(0);
int number = scanner.nextInt();
System.out.println("You Inputted:"+ letter+ equals+ number);
if(letter == "$PART2")
{
while(scanner.hasNext())
{
String postfix = scanner.nextLine();
System.out.println(postfix);
}
}
}