C Program to Perform Addition, Subtraction, Multiplication and Division

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.