Find the LCM in C Program || LCM of two numbers in C || Free Code Center

Find the LCM in C Program: A Comprehensive Guide

Welcome to our detailed guide on finding the Least Common Multiple (LCM) in the C programming language. In this article, we will explore the concept of LCM, its significance in programming, and provide you with step-by-step instructions on how to calculate the LCM using C. Whether you are a beginner or an experienced programmer, this article will equip you with the knowledge and techniques required to solve LCM problems efficiently. So, let’s dive in!

Understanding the Least Common Multiple (LCM)

The LCM of two or more numbers is the smallest positive integer that is divisible by each of the given numbers without leaving a remainder. It is a fundamental concept in mathematics and finds extensive application in various programming scenarios. LCM is particularly useful when dealing with multiple entities that have repeating patterns or cycles.

Importance of LCM in Programming

In programming, the LCM is often used to solve problems involving multiple elements or events that occur simultaneously or periodically. It helps determine the minimum time or the number of iterations required for all the elements to align in a specific manner.

Calculating the LCM in C

Now, let’s get into the details of how to calculate the LCM using the C programming language. Here’s a step-by-step approach to help you understand the process:

Step 1: Input the Numbers

Begin by taking input from the user or assign values to the variables representing the numbers for which you want to find the LCM.

Step 2: Find the Maximum Number

Identify the maximum number among the given set of numbers. This number will be used as the upper limit for iterating through the multiples.

Step 3: Initialize Variables

Initialize variables to keep track of the LCM and the iteration variable.

Step 4: Find the LCM

Start a loop that increments the iteration variable from the maximum number. Within the loop, check if the current iteration variable is divisible by all the given numbers. If it is, update the LCM value and break out of the loop.

Step 5: Output the LCM

Once the loop completes, output the calculated LCM value to the user or use it for further computations in your program.

Example Implementation

Here’s an example implementation of the LCM calculation in C:

Example : 1

#include <stdio.h>

int main() {
   int num1, num2, max, lcm = 0;

   printf("Enter two numbers: ");
   scanf("%d %d", &num1, &num2);

   max = (num1 > num2) ? num1 : num2;

   while (1) {
      if (max % num1 == 0 && max % num2 == 0) {
         lcm = max;

   printf("LCM of %d and %d is %d\n", num1, num2, lcm);

   return 0;

Example : 2

#include <stdio.h>

int main()


    int i, num1, num2, max, lcm=1;

    printf("Enter any two numbers to find LCM: ");

    scanf("%d%d", &num1, &num2);

    max = (num1 > num2) ? num1 : num2;

    i = max;



        if(i%num1==0 && i%num2==0)


            lcm = i;



        i=i+ max;


    printf("LCM of %d and %d = %d", num1, num2, lcm);

    return 0;



Congratulations! You have learned how to find the LCM in the C programming language. By following the steps outlined in this article and using the example implementation provided, you can now solve LCM problems efficiently. Understanding LCM is essential for mastering programming concepts that involve multiple entities and their periodic behavior.

C programming tutorial

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