Q:

# C++ program to find LCM of two numbers using functions

belongs to collection: C++ Number Solved Programs

Write a C++ program to find LCM of two numbers using functions. Here’s simple program to find LCM of two numbers using functions in C++ Programming Language.

A common multiple is a number that is a multiple of two or more numbers. The common multiples of 3 and 4 are 0, 12, 24, ….

The least common multiple (LCM) of two numbers is the smallest number (not zero) that is a multiple of both.

Here is source code of the C++ program to find LCM of two numbers using functions. The C++ program is successfully compiled and run(on Codeblocks) on a Windows system. The program output is also shown in below.

### SOURCE CODE : :

``````/*  C++ program to find LCM of two numbers using functions  */

#include<iostream>
using namespace std;

void lcm(int,int);

int main()
{
int a,b;

cout<<"Enter 1st number :: ";
cin>>a;
cout<<"\nEnter 2nd number :: ";
cin>>b;

lcm(a,b);

return 0;
}

//function to calculate l.c.m
void lcm(int a,int b)
{
int m,n;

m=a;
n=b;

while(m!=n)
{
if(m < n)
{
m=m+a;
}
else
{
n=n+b;
}
}

cout<<"\nL.C.M of [ "<<a<<" ] and [ "<<b<<" ] is :: "<<m<<"\n";
}``````

### Output : :

```/*  C++ program to find LCM of two numbers using functions  */

Enter 1st number :: 2

Enter 2nd number :: 15

L.C.M of [ 2 ] and [ 15 ] is :: 30

Process returned 0```

Above is the source code for C++ program to find LCM of two numbers using functions which is successfully compiled and run on Windows System.The Output of the program is shown above .