Question

I have a question on an assignment for C++. I have my code available here and just want someone to look over it using MS VS 2010 express, for that is what my instructor is using.

Write a program that mimics a calculator. The program should take as input two integers and the opreation to be performed. It should then output the numbers, the operator, and the result. (For division, if the denominator is zero, output an appropriate message.)

//**This program is designed to emulate a calculator by allowing the input of two integers, a mathematical operation, and creating an output from what the operator requests**//

#include <stdio.h>

int main(void)
{

   //Input the first integer of the problem; example: (1 + 1); the first of the two 1's is requested//
int a;
printf("Input first integer: ");
if (1 != scanf(" %i", &a))
{
printf("Input error\n");
return 0;
}

   //Input the operation; example: -, +, *, etc//
char op;
printf("Input operation: ");
if (1 != scanf(" %c", &op))
{
printf("Input error\n");
return 0;
}

   //Input the second integer here; example: (1+1); The second of the two 1's is requested//
int b;
printf("Input second integer: ");
if (1 != scanf(" %i", &b))
{
printf("Input error\n");
return 0;
}

   //The solution to the problem entered is shown here//
printf("The solution for the information given is: %i %c %i = ", a, op, b);

if (op == '*')
printf("%i\n", a * b);
else if (op == '/')
{
if (b == 0)
printf("undefined\n");
else
printf("%i\n", a / b);
           return 0;
}
else if (op == '-')
printf("%i\n", a - b);
else if (op == '+')
printf("%i\n", a + b);
else
printf("unsupported\n");
       return 0;
}

The issue that I am having is this works perfectly in CodeBlocks compiler, but not in MS VS 2010 Express. After the problem is input in the pop-up window it stays up in CodeBlocks, but disappears in MS VS 2010 Express. I know I don't have a pause command, so I don't know why it is working in one and not the other. Also, how does my commenting look?