GCDandLCM.cpp

// Program to calculate GCD and LCM of two numbers.

#include<iostream>
#include<conio.h>
#include<stdlib.h>

using namespace std;

int gcd(int x, int y)
{
    int r = 0, a, b;
    a = (x > y) ? x : y; // a is greater number
    b = (x < y) ? x : y; // b is smaller number

    r = b;
    while(a % b != 0)
    {
        r = a % b;
        a = b;
        b = r;
    }
    return r;
}

int lcm(int x, int y)
{
    int a;
    a = (x > y) ? x : y; // a is greater number
    while(true)
    {
        if(a % x == 0 && a % y == 0)
            return a;
        ++a;
    }
}

int main(int argc, char **argv)
{
    cout<<"Enter the two numbers: ";
    int x, y;
    cin>>x>>y;
    cout<<"The GCD of two numbers is: "<<gcd(x, y)<<endl;
    cout<<"The LCM of two numbers is: "<<lcm(x, y)<<endl;

    return 0;
}