Simple C Program: Calculate Sum of Two Integers

  

Write a C program that takes two integers as input from the user and calculates their sum. The program should then display the result to the user.

Requirements:

- The program should prompt the user to enter two integers.

- It should read the integers from the user input.

- Calculate the sum of the two integers.

- Display the sum to the user.

Example:

Enter the first integer: 5

Enter the second integer: 7

The sum of 5 and 7 is: 12

Solution:

  
    #include <stdio.h>
    int main() {
        int num1, num2, sum;

        // Prompt the user to enter the first integer
        printf("Enter the first integer: ");
        scanf("%d", &num1);

        // Prompt the user to enter the second integer
        printf("Enter the second integer: ");
        scanf("%d", &num2);

        // Calculate the sum
        sum = num1 + num2;

        // Display the sum
        printf("The sum of %d and %d is: %d\n", num1, num2, sum);

        return 0;
    }

Explaination: 

        1.     #include <stdio.h>: This line includes the standard input-output library, which provides functions like printf() and scanf() for input and output operations.

2. int main() { ... }: This is the main function of the program where execution begins.

3. int num1, num2, sum;: Three integer variables are declared to store the two input numbers (num1 and num2) and their sum (sum).

4. printf("Enter the first integer: ");: This line prints a message prompting the user to enter the first integer.

5. scanf("%d", &num1);: This line reads an integer input from the user and stores it in the variable num1. The %d format specifier is used to read integers, and &num1 is the address of the variable num1.

6. Similarly, the next printf() and scanf() statements are used to prompt the user for the second integer (num2).

7. sum = num1 + num2;: This line calculates the sum of the two input integers and stores it in the variable sum.

8. printf("The sum of %d and %d is: %d\n", num1, num2, sum);: This line prints the sum of the two integers along with their values using the printf() function. %d is used as a placeholder for integers, and the values of num1, num2, and sum are substituted into the string.

9. return 0;: This line indicates that the program has executed successfully and returns 0 to the operating system.