Tutorial Gateway

  • C
  • C#
  • Java
  • Python
  • SQL
  • MySQL
  • Js
  • BI Tools
    • Informatica
    • Talend
    • Tableau
    • Power BI
    • SSIS
    • SSRS
    • SSAS
    • MDX
    • R Tutorial
    • Alteryx
    • QlikView
  • More
    • C Programs
    • C++ Programs
    • Python Programs
    • Java Programs

C Program to find LCM of Two Numbers

by suresh

How to write a C Program to find LCM of Two Numbers with an example?. According to Mathematics, the Least Common Multiple (LCM) of two or more integers is the smallest positive integer that is perfectly divisible by the given integer values without the remainder.

For example, the C LCM value of integer 2 and 3 is 12 because 12 is the smallest positive integer that is divisible by both 2 and 3 (the remainder is 0).

C Program to find LCM of Two Numbers using While Loop

This lcm of two numbers in c program allows the user to enter two positive integer values and we are going to calculate the LCM of those two values using the While Loop.

TIP: Some people will call the Lowest Common Multiple as LCM in C

//C program to find LCM of two numbers
#include <stdio.h>

int main()
{
    int Num1, Num2, max_Value;

    printf("Please Enter two integer Values \n");
    scanf("%d %d", &Num1, &Num2);
    
    max_Value = (Num1 > Num2)? Num1 : Num2;
    
    while(1) //Alway True
    {
    	if(max_Value % Num1 == 0 && max_Value % Num2 == 0) 
    	{
    		printf("LCM of %d and %d = %d", Num1, Num2, max_Value);
    		break;
		}
		++max_Value;
	}
    return 0;
}

OUTPUT

C Program to find LCM of Two Numbers 2

C Program to find LCM of Two Numbers using GCD

This LCM program in C, we are going to calculate the Least Common Multiple of those two values using the While Loop.

TIP: The basic formula behind the Least Common Multiple or LCM in C is: LCM(a, b) = (a * b) / GCD. We already explained the GCD in our previous article. Please refer C Program to find GCD of Two Numbers article in C Programming for more information.

//C program to find LCM of two numbers
#include <stdio.h>

int main()
{
    int Num1, Num2, LCM, Temp, GCD;

    printf("Please Enter two integer Values \n");
    scanf("%d %d", &Num1, &Num2);

    int a = Num1;
    int b = Num2;
    
    while (Num2 != 0) {
 	Temp = Num2;
 	Num2 = Num1 % Num2;
 	Num1 = Temp;
    }
    GCD = Num1;
    printf("GCD of %d and %d = %d \n", a, b, GCD);
    
    LCM = (a * b) / GCD;
    printf("LCM of %d and %d = %d", a, b, LCM);
    return 0;
}

OUTPUT

C Program to find LCM of Two Numbers 1

C Program to find LCM of Two Numbers using Recursion

This program for lcm of two numbers in c allows you to enter two positive integer values. Next, we are going to calculate the Lowest Common Multiple of those two values by calling the function recursively. Please refer Recursion in C for further reference

//C program to find LCM of two numbers
#include <stdio.h>
long gcd(long x, long y);
int main()
{
    int Num1, Num2, GCD, LCM;

    printf("Please Enter two integer Values \n");
    scanf("%d %d", &Num1, &Num2);

    GCD = gcd(Num1, Num2);
    LCM = (Num1 * Num2) / GCD;
    printf("LCM of %d and %d is = %d", Num1, Num2, LCM);
    return 0;
}
long gcd(long x, long y) 
{
  if (y == 0) {
  	return x;
  }
  else {
    return gcd(y, x % y);
  }
}

OUTPUT

C Program to find LCM of Two Numbers 3

ANALYSIS

The following statement in this program to find lcm of two numbers in c will find the Least Common Multiple using the traditional formula.

LCM = (Num1 * Num2) / GCD;

When the compiler reaches to long gcd(long x, long y) line in main() program lcm in c example, the compiler will immediately jump to below function:

long gcd(long x, long y)

In the above-specified function, return gcd(y, x % y) statement will help the program to call the function Recursively with the updated value. If you miss this statement in C Program to find LCM of Two Numbers example, then after completing the first line, it will terminate.

Let’s see the If condition if (y == 0) will check whether the number is equal to 0 or not. For Recursive functions, it is very important to place a condition before using the function recursively. Otherwise, we will end up in infinite execution (Same like Infinite Loop).

Please be careful :)

Placed Under: C Programs

  • C Hello World
  • C Add Two numbers
  • C Armstrong Number Program
  • C Convert Celsius to Fahrenheit
  • C Convert Decimal to Binary
  • C Convert Decimal to Octal
  • C Convert CM to Meter and KM
  • C Convert KM to M, CM & MM
  • C Convert Fahrenheit to Celsius
  • C Compound Interest Program
  • C Count Digits in a Number
  • C Count Notes in an Amount
  • C Cube of a Number
  • C Electricity Bill Program
  • C Factors of a Number Program
  • C Factorial of a Number Program
  • C GCD of Two Numbers
  • C Generic Root of a Number
  • C Gross Salary of an Employee
  • C Largest of Two Numbers
  • C Largest of Three numbers
  • C Last Digit Of a Number
  • C LCM of Two Numbers
  • C Leap Year program
  • C Multiplication Table program
  • C Natural Numbers from 1 to N
  • C Natural Numbers in reverse
  • C NCR Factorial of a Number
  • C Number is Divisible by 5 and 11
  • C Palindrome Program
  • C Palindrome String program
  • C Perfect Number Program
  • C Profit or Loss Program
  • C Print 1 to 100
  • C Print Prime Numbers 1 to 100
  • C Prime Number program
  • C Prime Factors of a Number
  • C Prime, Armstrong or Perfect
  • C Positive or Negative program
  • C Print Odd Numbers 1 to N
  • C Print Even Numbers 1 to N
  • C Print Integer, Char & Float
  • C Power of a Number program
  • C Product of Digits in a Number
  • C Roots of a Quadratic Equation
  • C Reverse a Number
  • C Simple Calculator Program
  • C Simple Interest
  • C Square of a Number
  • C Square Root of a Number
  • C Standard Deviation program
  • C Strong Number Program
  • C Student Grade program
  • C Sum of Odd Numbers program
  • C Sum of Even Nums program
  • C Sum of Even and Odd Nums
  • C Swap First & Last digit of Num
  • C Sum of First & Last digit Num
  • C Sum of Digits of a Number
  • C Sum of N Numbers Program
  • C Sum and Average of n Number
  • C Swap 2 Numbers
  • C Total, Avg & % of Five Subjects
  • C Quick Sort
  • C Selection Sort
  • C Insertion Sort
  • C Bubble Sort
  • C Fibonacci Series Program
  • C Nth Fibonacci number
  • C Sum of AP Series
  • C Sum of GP Series
  • C Sum of series 1³+2³+3³+….+n³
  • C Sum of series 1²+2²+3²+….+n²
  • C ASCII value of String chars
  • C Print Characters in a String
  • C Compare Two Strings
  • C Concatenate Two Strings
  • C Copy String
  • C String length program
  • C Convert String to Lowercase
  • C First Occurrence of string char
  • C First Occur of String Word
  • C Count Occur of string Char
  • C Count Alphabets, Digits & Special Chars
  • C Count Vowels & Consonants
  • C string remove all Occ of char
  • C remove 1st Occ of char in string
  • C remove last Occ char in string
  • C replace All Occ of char in string
  • C Replace last Occ of String Char
  • C Replace 1st occ char in string
  • C Reverse words Order in string
  • C Reverse a String
  • C Toggle Case of all char in string
  • C Array Arithmetic Operations
  • C Matrix Arithmetic Operations
  • C Count Frequency of array item
  • C Count Duplicate Array items
  • C Count +ve & -Ve Array items
  • C Count Even & Odd Array items
  • C Copy an Array to another
  • C Delete Duplicate Array items
  • C Delete an Element in an Array
  • C insert an Element in an Array
  • C 2nd largest Number in an Array
  • C Find Largest Array Number
  • C Find Smallest Array Number
  • C Largest & Smallest Array item
  • C Merge Two Arrays
  • C Print Unique Array Elements
  • C Print Arrayy Elements
  • C Print Negative Array Numbers
  • C Print Positive Array Numbers
  • C Put +ve & -Ve in 2 Arrays
  • C Put Even & Odd in 2 Arrays
  • C Program to Reverse an Array
  • C Search an Element in an Array
  • C Sum of array even, odd nums
  • C Sort Array in Ascending Order
  • C Sort Array in Descending
  • C Swap 2 Arrays without Temp
  • C Sum of all Array Elements
  • C Sum of each Matrix column
  • C sum of each row in a Matrix
  • C Sum of Matrix row & column
  • C Add Two Matrices
  • C Sparse Matrix
  • C Symmetric Matrix
  • C Identity Matrix
  • C Interchange Matrix Diagonals
  • C Check two Matrices Equal
  • C Lower Triangle of a Matrix
  • C Upper Triangle of a Matrix
  • C Sum of Lower Triangle Matrix
  • C Sum of Upper Triangle Matrix
  • C Subtract Two Matrices
  • C Transpose of a Matrix program
  • C Cuboid Volume & Surface Area
  • C Cone Volume & Surface Area
  • C Cube Volume & Surface Area
  • C Volume & Surface of Cylinder
  • C Volume & Surface of Sphere
  • C Tutorial
  • C# Tutorial
  • Java Tutorial
  • JavaScript Tutorial
  • Python Tutorial
  • MySQL Tutorial
  • SQL Server Tutorial
  • R Tutorial
  • Power BI Tutorial
  • Tableau Tutorial
  • SSIS Tutorial
  • SSRS Tutorial
  • Informatica Tutorial
  • Talend Tutorial
  • C Programs
  • C++ Programs
  • Java Programs
  • Python Programs
  • MDX Tutorial
  • SSAS Tutorial
  • QlikView Tutorial

Copyright © 2021 | Tutorial Gateway· All Rights Reserved by Suresh

Home | About Us | Contact Us | Privacy Policy