C program to perform basic arithmetic operations of two numbers. Numbers are assumed to be integers and will be entered by the user.

```
#include <stdio.h>
int main()
{
int first, second, add, subtract, multiply;
float divide;
printf("Enter two integers\n");
scanf("%d%d", &first, &second);
add = first + second;
subtract = first - second;
multiply = first * second;
divide = first / (float)second; //typecasting
printf("Sum = %d\n",add);
printf("Difference = %d\n",subtract);
printf("Multiplication = %d\n",multiply);
printf("Division = %.2f\n",divide);
return 0;
}
```

Program Output:

When we divide two integers in C language we get integer result for example 5/2 evaluates to 2. As a general rule **integer/integer = integer** and **float/integer = float** or **integer/float = float**. So we convert denominator to float in our program, you may also write float in numerator. This is known as explicit conversion **typecasting**.