 ### Find LCM of two numbers in C, C++, Java and Python ### Select Articles

Find LCM of two numbers in C, C++, Java and Python

Program to find LCM of two numbers is discussed here. Two numbers are obtained as input and the prime factors of both the numbers are found. The product of the union of prime factors of both the numbers gives the LCM of the two numbers.

Program to find LCM of two numbers

C

#include

int main()

{

int a, b, lcm;

printf(“\nEnter two numbers: “);

scanf(“%d %d”, &a, &b);

lcm = (a > b) ? a : b;

while(1)

{

if( lcm % a == 0 && lcm % b == 0 )

{

printf(“\nLCM of ?nd %d is %d\n”, a, b,lcm);

break;

}

++lcm;

}

return 0;

}

C++

#include

using namespace std;

int main()

{

int a, b, lcm;

cout << “\nEnter two numbers: “;

cin >> a >> b;

lcm = (a > b) ? a : b;

while(1)

{

if( lcm % a == 0 && lcm % b == 0 )

{

cout << “\nLCM of ” << a>

break;

}

++lcm;

}

return 0;

}

JAVA

import java.util.*;

public class Main

{

public static void main(String args[])

{

int a,b,lcm,flag = 1;

System.out.print(“\nEnter two numbers : “);

Scanner sc = new Scanner(System.in);

a = sc.nextInt();

b = sc.nextInt();

lcm = (a > b) ? a : b;

while(flag == 1)

{

if( lcm % a == 0 && lcm % b == 0 )

{

System.out.println(“LCM of ” + a + ” and ” + b + ” is ” + lcm);

flag = 0;

break;

}

++lcm;

}

}

}

PYTHON 3

print(“Enter two numbers “)

a = int(input())

b = int(input())

lcm = 0

if(a > b):

lcm = a

else:

lcm = b

while(1):

if( lcm % a == 0 and lcm % b == 0 ):

print(“LCM of”,a,”and”,b,”is”,lcm)

break

lcm = lcm + 1

Output

Input- Enter two numbers: 7 21 Output- LCM of 7 and 21 is 21

Program to find LCM of two numbers by finding their GCD

C

// LCM of two numbers in C

#include

int GCD(int a, int b)

{

if (a == 0 || b == 0)

return 0;

if (a == b)

return a;

if (a > b)

return GCD(a-b, b);

return GCD(a, b-a);

}

int LCM(int a, int b)

{

return (a*b)/GCD(a, b);

}

int main()

{

int a,b;

printf(“\nEnter two numbers : “);

scanf(“%d %d”,&a,&b);

printf(“\nLCM of ?nd %d is %d \n”, a, b, LCM(a, b));

return 0;

}

C++

// LCM of two numbers in C++

#include

using namespace std;

int GCD(int a, int b)

{

if (a == 0 || b == 0)

return 0;

if (a == b)

return a;

if (a > b)

return GCD(a-b, b);

return GCD(a, b-a);

}

int LCM(int a, int b)

{

return (a*b)/GCD(a, b);

}

int main()

{

int a,b;

cout << “\nEnter two numbers : “;

cin >> a >> b;

cout << “\nLCM of ” << a>

return 0;

}

JAVA

// LCM of two numbers in java

import java.util.*;

public class Main

{

static int GCD(int a, int b)

{

if (a == 0 || b == 0)

return 0;

if (a == b)

return a;

if (a > b)

return GCD(a-b, b);

return GCD(a, b-a);

}

static int LCM(int a, int b)

{

return (a*b)/GCD(a, b);

}

public static void main(String args[])

{

int a,b;

System.out.print(“\nEnter two numbers : “);

Scanner sc = new Scanner(System.in);

a = sc.nextInt();

b = sc.nextInt();

System.out.println(“LCM of ” + a + ” and ” + b + ” is ” + LCM(a,b));;

}

}

PYTHON 3

# LCM of two numbers in python

def GCD(a, b):

if (a == 0 or b == 0):

return 0

if (a == b):

return a;

if (a > b):

return GCD(a-b, b);

return GCD(a, b-a);

def LCM(a, b):

return int((a*b)/GCD(a, b));

print(“Enter two numbers “)

a = int(input())

b = int(input())

print(“LCM of”,a,”and”,b,”is”,LCM(a,b))

Output

Input- Enter two numbers: 7 21 Output- LCM of 7 and 21 is 21