Program 15 - CSU1128 - CSE 2026 - Shoolini University

Program to print even numbers between the numbers that the user chooses. Example 1 to 100

Explanation

The program prints all even numbers between two numbers input by the user.

Header

The code begins with including the standard input-output header file using #include <stdio.h>.

Variable Declaration

The main() function is defined, and two integer variables d and m are declared.

Program Description

The program prints a description message for the user to understand its functionality.

User Input

The user is prompted to enter two numbers between which they want to print all the even numbers. The input is read using scanf("%d %d", &d, &m);.

Swapping Logic

If the user enters the larger number first, a conditional statement swaps the values of d and m to ensure d is always the smaller number:

if (d > m): Checks if d is greater than m.
int j = d;: Temporarily stores d in j.
d = m;: Assigns the value of m to d.
m = j;: Assigns the stored value in j to m.

Even Number Printing

The program prints all even numbers between d and m using a while loop:

while (d <= m): Continuously checks if d is less than or equal to m.
if (d % 2 == 0): Checks if the current value of d is even.
printf("%d\t", d);: Prints the current value of d if it is even.
d++;: Increments d by 1.

Program End

The program ends with printf("\n"); to print a new line and return 0; to indicate successful execution.

Code

                    
/*
 * -----------------------------------------------------------
 * Logic Building with Computer Programming (CSU1128)
 * Instructor: Dr. Pankaj Vaidya | Author: Divya Mohan
 * 
 * This code is a part of the educational initiative by dmj.one
 * with aim of empowering and inspiring learners in the field of
 * Computer Science and Engineering through the respective courses.
 * 
 * (c) 2022, Divya Mohan for dmj.one. All rights reserved.
 * -----------------------------------------------------------
 */

#include <stdio.h>
int main()
{
    int d, m;
    printf("\n\n Program to print even numbers between the numbers that the user chooses. Example 1 to 100. \n\n");

    printf("Enter two numbers between which you want to print all the even numbers - (Example: 2 100) - and press enter: ");
    scanf("%d %d", &d, &m);

    // if loop to swap max number if user enters a bigger number first.
    if (d > m)
    {
        int j = d;
        d = m;
        m = j;
    }

    printf("\nPrinting all the even numbers between %d and %d: \n\t", d, m);
    while (d <= m)
    {
        if (d % 2 == 0)
        {
            printf("%d\t", d);
        }
        d++;
    }
    printf("\n");
    return 0;
}

Output

Program to print even numbers between the numbers that the user chooses. Example 1 to 100.

Enter two numbers between which you want to print all the even numbers - (Example: 2 100) - and press enter: 23 54
Printing all the even numbers between 23 and 54: 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54