Swap Two Numbers

#include <stdio.h>

int main() 
{
    // Declare variables to store the two numbers
    int num1, num2, temp;

    // Ask the user for input
    printf("Enter the first number: ");
    scanf("%d", &num1);

    printf("Enter the second number: ");
    scanf("%d", &num2);

    // Display numbers before swapping
    printf("Before swapping: num1 = %d, num2 = %d\n", num1, num2);

    // Swap the numbers
    temp = num1;  // Store num1 in a temporary variable
    num1 = num2;  // Assign the value of num2 to num1
    num2 = temp;  // Assign the value of temp (original num1) to num2

    // Display numbers after swapping
    printf("After swapping: num1 = %d, num2 = %d\n", num1, num2);

    return 0;
}

Explanation

return 0;: This indicates that the program finished successfully and is returning an exit status of 0.

#include <stdio.h>:

This line includes the standard input-output library, allowing us to use functions for input and output, like printf and scanf.

int main():

This defines the main function, where the program starts executing. The int indicates that this function will return an integer value.

Variable Declaration:

int num1, num2, temp;: Here, we declare three integer variables: num1 and num2 for storing the user inputs, and temp for temporarily holding one of the values during the swap.

Input from the User:

printf("Enter the first number: ");: This prompts the user to enter the first number.

scanf("%d", &num1);: This reads the integer input and stores it in num1.

The same two lines are repeated for the second number, storing it in num2.

Displaying Values Before Swapping:

printf("Before swapping: num1 = %d, num2 = %d\n", num1, num2);: This line prints the values of num1 and num2 before they are swapped.

Swapping the Numbers:

temp = num1;: The value of num1 is stored in the temporary variable temp.

num1 = num2;: The value of num2 is assigned to num1.

num2 = temp;: The original value of num1 (stored in temp) is assigned to num2.

Displaying Values After Swapping:

printf("After swapping: num1 = %d, num2 = %d\n", num1, num2);: This prints the new values of num1 and num2 after swapping.

Return Statement:

return 0;: This indicates that the program finished successfully and is returning an exit status of 0.

OUTPUT

Enter two numbers:
5 10
Before swapping: a = 5, b = 10
After swapping: a = 10, b = 5