car rental program

Question

surajdevesan -4 Newbie Poster

13 Years Ago

hello guys,

The file is not getting deleted in the function modify for some reason.....pls help!!!!!!
pls do look at this code

#include <iostream.h>
#include <conio.h>
#include <fstream.h>
#include <stdio.h>
#include <iomanip.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <process.h>
#include <math.h>
#include <windows.h>



class car
{

     int no;
     char name[30];
     char color[10];
     int distance;
     int price;
     public:
     int distance1()
     {
      return distance;
     }
     void copy(int r,car ob2)
     {
       strcpy(name,ob2.name);
       no=ob2.no;
       strcpy(color,ob2.color);
       distance=ob2.distance+r;
       price=ob2.price;
       }
     int namec(char name1[30])
     {
      if(strcmpi(name,name1))
       return 1;
      else
       return 0;
      }
     int reno()
     {
        return no;
     }
     void display1()
     {
          cout<<setw(6)<<no
              <<setw(25)<<name
              <<setw(8)<<color
              <<setw(10)<<distance
              <<setw(16)<<price;

     }

     void input()
     {
          cout<<"SERIAL NO:";
          cin>>no;
          cout<<"NAME:";
          gets(name);
          cout<<"COLOUR:";
          cin>>color;
          cout<<"DISTANCE:";
          cin>>distance;
          cout<<"PRICE PER DAY:";
          cin>>price;
     }

}ob1;


class info
{

     char name[20];
     int age,carno;
     char adress[30];
     long number;
     int days;

     public:
     int namec(char name1[30])
     {
      if(strcmpi(name,name1))
       return 1;
      else
       return 0;
      }
     void input(int n)
     {
          cout<<"\n\n\nENTER THE NAME: ";
          gets(name);
          cout<<"\n\nENTER THE AGE: ";
          cin>>age;
          if(age<18)
           {
            cout<<"\n\n\nYOU ARE UNDERAGE THEREBY NOT ALLOWED TO DRIVE";
            getch();
            exit(0);
           }
          cout<<"\n\nENTER THE ADRESS: ";
          gets(adress);
          cout<<"\n\nENTER THE PHONE NUMBER: ";
          cin>>number;
          carno=n;
          cout<<"\n\nINPUT THE NO OF DAYS: ";
          cin>>days;
     }
     void display3()
     {
          cout<<setw(3)<<carno
              <<setw(10)<<name
              <<setw(4)<<age
              <<setw(12)<<adress
              <<setw(10)<<number
              <<setw(10)<<days;

     }
     int cno()
     {
         return carno;
     }
}ob2;




void modify(int no,int t=0)
{
     char b[10];
     char a[30];
     if(t==0)
     { strcpy(b,"ob2");
       strcpy(a,"info.dat");
     }
     else
       if(t==1||t==11)
       {

         strcpy(b,"ob1");
         strcpy(a,"sports.dat");
       }
       else
         if(t==2||t==22)
         {
           strcpy(b,"ob1");
           strcpy(a,"leisure.dat");
         }
         else
           if(t==3||t==33)
           {
             strcpy(b,"ob1");
             strcpy(a,"suv.dat");
           }



     ofstream filin("sefault.dat",ios::binary);
     ifstream filout(a,ios::binary);
     if(t!=0)
     {

       while(filout.read((char *)&ob1,sizeof(ob1)))
            if(ob1.reno()!=no)
              {

               filin.write((char *)&ob1,sizeof(ob1));
              }
     }

     else
       while(filout.read((char *)&ob2,sizeof(ob2)))
            if(ob2.cno()!=no)
              filin.write((char *)&ob2,sizeof(ob2));

     filin.close();
     filout.close();
     remove(a);   //the problem is here
     rename("sefault.dat",a);



     if(t==1||t==2||t==3)
     {

      ofstream filin1("sefault.dat",ios::binary|ios::app);
      ifstream filout1("!!cars.dat",ios::binary);

       while(filout1.read((char *)&ob1,sizeof(ob1)))
            if(ob1.reno()!=no)
              filin1.write((char *)&ob1,sizeof(ob1));



     filin1.close();
     filout1.close();


     remove("!!cars.dat");

     rename("sefault.dat","!!cars.dat");
    }

     
}




void display(char nameofcar[],int t=0)
{
     ifstream filin(nameofcar,ios::binary);
     cout<<endl<<endl;

     cout<<setw(6)<<"SL NO"
         <<setw(25)<<"NAME OF THE CAR"
         <<setw(8)<<"COLOUR"
         <<setw(10)<<"DISTANCE"
         <<setw(18)<<"PRICE PER DAY\n\n";

     while(filin.read((char *)&ob1,sizeof(ob1)))
     {
          if(t!=0)
            if(t==ob1.reno())
            {
              ob1.display1();
              break;
            }
          if(t==0)
            ob1.display1();
          cout<<"\n";

     }
     filin.close();
}




void returning()
{
     top:
     int no;
     cout<<"\n\nENTER THE REFERENCE NO:";
     cin>>no;
     ifstream filin("info.dat",ios::binary);
     while(filin.read((char*)&ob2,sizeof(ob2)))
      if(ob2.cno()==no)
      {


     cout<<"WHAT TYPE OF CAR DID YOU RENT";
     cout<<"\n\n  1.SPORTS CAR";
     cout<<"\n\n  2.LEISURA CAR";
     cout<<"\n\n  3.SUV";
     int op2;
     cout<<"\n\n\n    ENTER YOUR OPTION:";
     cin>>op2;



             int distance;
            cout<<"\n\nENTER THE DISTANCE TRAVELLED:";
            cin>>distance;
            int n1=ob2.cno();
            char ab[20];
            switch(op2)
            {
               case 1:
                display("sports.dat",n1);
                strcpy(ab,"sports.dat");

                break;
               case 2:
                display("leisure.dat",n1);
                strcpy(ab,"leisure.dat");
                break;
               case 3:
                display("suv.dat",n1);
                strcpy(ab,"suv.dat");
                break;
            }
         int r;
         filin.close();
         car ob3;
         ofstream filin1(ab,ios::binary|ios::app);
         ifstream filin2("!!cars.dat",ios::binary);
         while(filin2.read((char *)&ob1,sizeof(ob1)))
         {
          cout<<"inside if";
                 getch();

              if(ob1.reno()==no)
                {

                 ob3.copy(distance,ob1);
                 filin1.write((char *)&ob3,sizeof(ob3));

              }
         }

              filin1.close();
         filin2.close();

     modify(no);

         }




     else
      {
       filin.close();
       cout<<"INVALID NO";
       getch();
       goto top;
       }





}




void rent(char nameofcar[30])
{
     nor:
     clrscr();
     int no;
     int t=0;
     display(nameofcar);
     cout<<"\n\nINPUT THE CAR NO";
     cin>>no;

     ifstream filin(nameofcar,ios::binary);
     while(filin.read((char *)&ob1,sizeof(ob1)))
          if(ob1.reno()==no)
          {
            clrscr();
            display(nameofcar,no);
            t=1;
            cout<<"\n\n\n";
            ob2.input(no);
            ofstream file("info.dat",ios::app|ios::binary);
            file.write((char *)&ob2,sizeof(ob2));
            file.close();
            int n;
            if(strcmpi(nameofcar,"sports.dat")==0)
             n=11;
            else
             if(strcmpi(nameofcar,"leisure.dat")==0)
              n=22;
              else
               n=33;

            modify(no,n);


          }
     if(t==0)
     {
       cout<<"\n\n\nINVALID NO";
       getch();
       goto nor;
     }
     filin.close();
     getch();
     clrscr();

}

void display2()
{
 cout<<setw(6)<<"CAR NO"<<setw(6)<<"NAME"<<setw(6)<<"AGE"<<setw(12)<<"ADDRESS"<<setw(12)<<"PHONE NO"<<setw(15)<<"NO OF DAYS\n\n";
  ifstream filin("info.dat",ios::binary);
  while(filin.read((char *)&ob2,sizeof(ob2)))
  ob2.display3();
 }


void creator()
{
     clrscr();
     cout<<"\n\n\n\n\n WHAT DO YOU WANT TO DO:";
     cout<<"\n\n  1.ADD A CAR";
     cout<<"\n\n  2.EDIT CARS";
     cout<<"\n\n  3.DELETE A CAR";
     cout<<"\n\n  4.CAR DETAILS";
     cout<<"\n\n  5.RENTAL INFORMATION";

     int option;
     cout<<"\n\n\n    ENTER YOUR OPTION";
     cin>>option;

     clrscr();
     cout<<"\n\n";

     switch(option)
     {
        case 1:
        {
         int n;
         char namecar1[30];
         cout<<"NO OF CARS TO BE INPUTED: ";
         cin>>n;
         cout<<"\nENTER THE TYPE OF CAR: ";
         cout<<"\n\n  1.SPORTS CAR";
         cout<<"\n\n  2.LEISURE CAR";
         cout<<"\n\n  3.SUV";
         int op3;
         cout<<"\n\n\n    ENTER YOUR OPTION: ";
         cin>>op3;

         clrscr();
         cout<<"\n\n";

         switch(op3)
         {
            case 1:
             strcpy(namecar1,"sports.dat");
             break;
            case 2:
             strcpy(namecar1,"leisure.dat");
             break;
            case 3:
             strcpy(namecar1,"suv.dat");
             break;
         }

         ofstream filin(namecar1,ios::binary|ios::app);
         ofstream filin2("!!cars.dat",ios::binary|ios::app);

         for(int i=0;i<n;i++)
         {
           ob1.input();
           filin.write((char *)&ob1,sizeof(ob1));
           filin2.write((char*)&ob1,sizeof(ob1));
         }
         filin.close();
         filin2.close();
         break;
        }
        case 2:
        {
         cout<<"\n\n\n\nSELECT THE CAR TO BE MODIFIED";
         cout<<"\nENTER THE TYPE OF CAR: ";
         cout<<"\n\n  1.SPORTS CAR";
         cout<<"\n\n  2.LEISURA CAR";
         cout<<"\n\n  3.SUV";
         int op3;
         cout<<"\n\n\n    ENTER YOUR OPTION:";
         cin>>op3;

         clrscr();
         cout<<"\n\n";

         char namecar1[30];
         switch(op3)
         {
            case 1:
             strcpy(namecar1,"sports.dat");
             break;
            case 2:
             strcpy(namecar1,"leisure.dat");
             break;
            case 3:
             strcpy(namecar1,"suv.dat");
         }
         display(namecar1);
         cout<<"\n\n\n ENTER THE CAR  NO:";
         cin>>op3;
         fstream filin(namecar1,ios::binary|ios::in|ios::out);
         fstream filin2("!!cars.dat",ios::binary|ios::in|ios::out);
         while(filin.read((char *)&ob1,sizeof(ob1)))
         {

              if(ob1.reno()==op3)
              {
                ob1.input();
                filin.seekp(-sizeof(ob1),ios::cur);
                filin.write((char *)&ob1,sizeof(ob1));
              }
         }
          while(filin2.read((char *)&ob1,sizeof(ob1)))
         {

              if(ob1.reno()==op3)
              {
                ob1.input();
                filin2.seekp(-sizeof(ob1),ios::cur);
                filin2.write((char *)&ob1,sizeof(ob1));
              }
         }
         filin.close();
         filin2.close();
        }
        case 3:
        {
         clrscr();
         cout<<"\n\n\n\nSELECT THE CAR TO BE DELETED";
         cout<<"\nENTER THE TYPE OF CAR: ";
         cout<<"\n\n  1.SPORTS CAR";
         cout<<"\n\n  2.LEISURA CAR";
         cout<<"\n\n  3.SUV";
         int op3;
         cout<<"\n\n\n    ENTER YOUR OPTION:";
         cin>>op3;

         clrscr();
         cout<<"\n\n";

         char namecar1[30];
         int t;
         switch(op3)
         {
            case 1:
             strcpy(namecar1,"sports.dat");
             t=1;
             break;
            case 2:
             strcpy(namecar1,"leisure.dat");
             t=2;
             break;
            case 3:
             strcpy(namecar1,"suv.dat");
             t=3;
         }
         display(namecar1);
         cout<<"\n\n\n ENTER THE REFERENCE NO:";
         int refno;
         cin>>refno;
         modify(refno,t);
         break;
        }
       case 4:
        display("!!cars.dat");
        break;

       case 5:
       display2();
     }
}



void box()
{

	  char c1=178, c2=177, c3=176;
     gotoxy(1,2);
	  for(int i=1; i<=1840; i++)
	  {
        int j=0;
        gotoxy(j,2);
	     cout<<c3;
        j++;
        if(j>=79)
        j=0;
     }

}


void setcolor(unsigned short color) 	//begining of set color funtion
{
     HANDLE hCon = GetStdHandle(STD_OUTPUT_HANDLE);  	//gets std handle
     SetConsoleTextAttribute(hCon,color); 	//Sets Console Text Attribute HCon color.
}


void carrental()
{

     for(int i=0;i<=3;i++)
     {
        clrscr();
        if(i==1||i==3)
          textcolor(BLUE);
        else
          textcolor(BLACK);
        int wait=0;
        while(++wait<1000000000)
            ;
        for(int i=0;i<=3;i++)
        {  cprintf("*");
        }
        cout<<"\n*";
        wait=0;
        while(++wait<1000000000)
            ;
     }
     getch();
}


void main()
{
     textbackground(BLUE);
     setcolor(2);
     box();

     textbackground(BLACK);

     int op;
     do
     {


       clrscr();
       setcolor(5);

       gotoxy(32,8);
       setcolor(3);
       textcolor(RED);
       cprintf("WHAT DO YOU WANT TO DO:");
       gotoxy(32,10);
       setcolor(5);
       cprintf("     1.RENT A CAR     ");
       gotoxy(32,12);
       setcolor(5);
       cprintf("     2.RETURN A CAR     ");
       gotoxy(32,14);
       setcolor(5);
       cprintf("     3.EDIT           ");
       gotoxy(33,16);
       cprintf("    4.EXIT     ");
       gotoxy(33,18);
       setcolor(4);
       cprintf("    ENTER THE OPTION:     ");
       cin>>op;
       switch(op)
       {
          case 1:
           clrscr();



           cout<<"\n\n\n\nDO YOU WANT TO RENT A:";
           cout<<"\n\n  1.SPORTS CAR";
           cout<<"\n\n  2.LEISURE CAR";
           cout<<"\n\n  3.SUV";
           int op2;
           cout<<"\n\n\n    ENTER YOUR OPTION:";
           cin>>op2;
           switch(op2)
           {
              case 1:
               rent("sports.dat");
               break;
              case 2:
               rent("leisure.dat");
               break;
              case 3:
               rent("suv.dat");
               break;
           }
           break;
          case 2:
           returning();
           break;                                  

          case 3:
           creator();
           getch();
           break;





       }

     }while(op<=3);

}

c++

3 Contributors
3 Replies
5K Views
7 Hours Discussion Span
Latest Post 13 Years Ago Latest Post by VernonDozier

VernonDozier 2,218 Posting Expert

13 Years Ago

You need to get rid of the "div" tags. It's hard to read otherwise.

Both of these functions have error flags associated with them and you can find out what the exact error is.

Return value
If the file is successfully renamed, a zero value is returned.
On failure, a nonzero value is returned and the errno variable is set to the corresponding error code. Error codes are numerical values representing the type of failure occurred. A string interpreting this value can be printed to the standard error stream by a call to perror.

Call perror and find out what the error is and go from there.

http://www.cplusplus.com/reference/clibrary/cstdio/rename/
http://www.cplusplus.com/reference/clibrary/cstdio/perror/

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WaltP 2,905 Posting Sage w/ dash of thyme Team Colleague · Answer 1 · 2011-08-24T21:20:03+00:00

Don't post 681 lines of code when all you're interested in is 70 lines. Makes the problem harder to find.

surajdevesan -4 Newbie Poster · Answer 2 · 2011-08-24T22:12:26+00:00

the file is not getting deleted or renamed eventhough i am using the remove function.......
pls help!!! its really urgent!!!!!!!!!!

void modify(int no,int t=0)
{
     char b[10];
     char a[30];
     if(t==0)
     { strcpy(b,"ob2");
       strcpy(a,"info.dat");
     }
     else
       if(t==1||t==11)
       {

         strcpy(b,"ob1");
         strcpy(a,"sports.dat");
       }
       else
         if(t==2||t==22)
         {
           strcpy(b,"ob1");
           strcpy(a,"leisure.dat");
         }
         else
           if(t==3||t==33)
           {
             strcpy(b,"ob1");
             strcpy(a,"suv.dat");
           }



     ofstream filin("sefault.dat",ios::binary);
     ifstream filout(a,ios::binary);
     if(t!=0)
     {

       while(filout.read((char *)&ob1,sizeof(ob1)))
            if(ob1.reno()!=no)
              {

               filin.write((char *)&ob1,sizeof(ob1));
              }
     }

     else
       while(filout.read((char *)&ob2,sizeof(ob2)))
            if(ob2.cno()!=no)
              filin.write((char *)&ob2,sizeof(ob2));

     filin.close();
     filout.close();
     remove(a);   //the problem is here i guess
     rename("sefault.dat",a);



     if(t==1||t==2||t==3)
     {

      ofstream filin1("sefault.dat",ios::binary|ios::app);
      ifstream filout1("!!cars.dat",ios::binary);

       while(filout1.read((char *)&ob1,sizeof(ob1)))
            if(ob1.reno()!=no)
              filin1.write((char *)&ob1,sizeof(ob1));



     filin1.close();
     filout1.close();


     remove("!!cars.dat");

     rename("sefault.dat","!!cars.dat");
    }


}

URGENT tends to make others ignore posts. If we can help, we will. But URGENT makes us not want to help.