C :

#include<stdio.h>
#include<math.h>
int yueshu(int a,int b)
{
	int t;
	while(b)
	{
		t=a%b;
		a=b;
		b=t;
	}
	return a;
}
int beishu(int a,int b)
{
	int t=yueshu(a,b);
	return a*b/t;
}
int main()
{
	int i,j,a,b;
	scanf("%d%d",&a,&b);
	printf("%d %d",yueshu(a,b),beishu(a,b));
} 

C++ :

#include<iostream>
using namespace std;
int gcd(int m,int n)
{
	int r=m%n;
	while (r)
	{
		m=n;
		n=r;
		r=m%n;
	}
	return n;
}
int lcd(int m,int n)
{
	return m*n/gcd(m,n);
}
int main()
{
	int m,n;
	cin>>m>>n;
	cout<<gcd(m,n)<<" "<<lcd(m,n)<<endl;
	return 0;
}