Divide by zero workaround not working(basic C++ calc)

[ROCKRIDER50]

Hi,

I just started learning C++ the day before yesterday. I am attemptinng to create a basic calculator based solely on my basic knowledge of ints, variables, if...else and boolean operators. I'm using Codeblocks as my IDE and the integrated GNU GCC compiler. Here's the code.

#include <iostream>

using namespace std;


int main()
{
  restart:
  int a,b,c,x;

  cout << "Welcome to the advanced arithmetic calculator.\nWhat do you want to do?\n1)Add\n2)Sub\n3)Mul\n4)Div\n\n";
  cin >> x;

  if(x==1||x==2||x==3||x==4)
  {
      cout << "\nEnter first number.\n\n";
      cin >> a;

      cout << "\nEnter second number.\n\n";
      cin >> b;

      if(x==1)
      {
        c=a+b;
      }

      else if(x==2)
      {
          c=a-b;
      }

      else if(x==3)
      {
          c=a*b;
      }
      else if(x==4 && b!=0)
      {
          c=a/b;

      }
      else if(x==4 && b==0)
      {
          cout << "\nUNDEFINED.\n\n";
          goto restart;
      }

      cout <<endl<< c <<" is the answer.\n\n";
  }
  else
  {
      cout << "\nERROR\n\n-------------\n\n";
      goto restart;
  }

  //-------------------------End of first calc

  cout <<"What would you like to do next? Would you like to 1)Restart or 2)Exit?\n\n";
  cin >> x;

  if(x==1)
  {
      goto restart;
  }

  else
  {
      cout << "\nBye.\n\n";
      return 0;
  }
}

You may have noticed my workaround for divide by zero:

 else if(x==4 && b!=0)
      {
          c=a/b;

      }
 else if(x==4 && b==0)
      {
          cout << "\nUNDEFINED.\n\n";
          goto restart;
      }

However, every time I run the program, attempting to divide by zero causes a crash and the program fails to return zero.

What am I doing wrong here?

[MiiNiPaa]

Your code should work. Did you rebuild the project after making changes?

[ROCKRIDER50]

Yes. By default, I rebuild and execute.

P.S :Sorry for the late reply. I didn't expect it to be so prompt.

[MiiNiPaa]

Works fine: http://ideone.com/nNZkEf

Try to force rebuild manually. Make sure that you have proper project open (it is easy to modify current project, but compile previous).

[ROCKRIDER50]

Nope. Should I try a different compiler??

In addition, code after //end of first calc------------------
is not being executed, even if i just do add, sub, mul or proper div.

[ROCKRIDER50]

It returns zero however (see previous).

[MiiNiPaa]

Copy your code. Create new project (close all subwindows and projects before). Paste your code. Check.

[ROCKRIDER50]

SOLVED. Praise thee, MiiNiPaa, who hath solved my problem. Thanks a ton. BTW, why did this help, exactly?

[MiiNiPaa]

You messed up project settings. If you had more than one project open or created new one before problem arised, you might forget to change active one.

[novellof]

Use a switch statement for your menu of selecting the operation