Go: package main

import "fmt"

func GCM(a, b int) int {
	if a < b {
		a, b = b, a
	}
	if b == 0 {
		return a
	}
	return GCM(b, a % b)
}

func LCM(a, b int) int {
	return a*b/GCM(a, b)
}

func main() {

	for {
		var a, b int
		var G, L int
		fmt.Scanf("%d %d", &a, &b)
		if a == 0 {
			break
		}
		G = GCM(a, b)
		L = LCM(a, b)
		fmt.Printf("%d %d\n", G, L)
	}
}

C++: #include<iostream>
using namespace std;
int GCD(int x, int y);
int main(){
  int a,b;
  while(cin >>a>>b){
    cout <<GCD(a,b)<<" "<<a/GCD(a,b)*b<<endl;
  }
  return 0;
}
int GCD(int x, int y){
  if(!y){return x;}
  return GCD(y,x%y);
}

C++: #include <bits/stdc++.h>
#define INT(name) int name; scanf("%d",&name);
#define VINT(name,n) vector<int> name(n); for(int i = 0;i < n;i++) scanf("%d",&name[i]);

using namespace std;

int gcd_(int a,int b){
	if(a == b)	return a;
	int temp = a - b;
	if(temp < b)	swap(temp,b);
	return gcd_(temp,b);
}

int main(int argc, char const *argv[]){
	int a,b,gcd,lcm;
	while(cin >> a >> b){
		if(a < b)	swap(a,b);
		gcd = gcd_(a,b);
		lcm = a / gcd * b;
		printf("%d %d\n",gcd,lcm);
	}
}

C++: #include <iostream>
#include <vector>
#include <cmath>
#include <map>

typedef long long ll;
using namespace std;

ll gcd(ll a, ll b)
{
    while( 1 )
    {
a = a % b;
if( a == 0 )return b;
b = b % a;
if( b == 0 )return a;
    }
}

int main()
{
ll a,b;
while(~scanf("%lld %lld",&a,&b)){
printf("%lld %lld",gcd(a,b),(a*b)/gcd(a,b));
}
}

C++: #include <iostream>
using namespace std;

int main(void)
{
	long long  l1, l2, tmp1, tmp2, tmp;
	while (cin >> l1 >> l2) {
		tmp1 = max(l1, l2);
		tmp2 = min(l1, l2);
		while (tmp1 && tmp2) {
			tmp = tmp1 % tmp2;
			tmp1 = tmp2;
			tmp2 = tmp;
		}
		tmp2 = l1 * l2 / tmp1;

		cout << tmp1 << " " << tmp2 << endl;
	}

	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;

long long gcd(long long x, long long y){
    if(y==0){
        return x;
    }
    else{
        return gcd(y,x%y);
    }
}

int main(){
    long long a,b,ans =0;

    while(cin>>a>>b){
    ans =0;
   
    ans=gcd(a,b);
    cout<<ans<<" "<<a*b/ans<<endl;
}
}

C++: #include <iostream>
#include <algorithm>
using namespace std;

int main(){
	long long int a,b,x,y,z;
	
	while(cin >> a >> b,a,b){
		x=max(a,b);
		y=min(a,b);
		while(1){
			if(y==0) break;
			z=x%y;
			x=y;
			y=z;
		}
		
		cout << x << ' ' << a*b/x << endl;
	}
	
	return 0;
}

C++: #include <iostream>
using namespace std;

int main(){
  int a, b;
  int ca, cb, tmp;
  int gcd, lcm;

  while(cin >> a){
    cin >> b;
    ca=a; cb=b;

    if(ca<cb){
      tmp=ca; ca=cb; cb=tmp;
    }

    while(cb==0){
      ca%=cb;
      if(ca==0){
        ca=cb;
        break;
      }
      cb%=ca;
    }
    gcd=ca;
    lcm=a*b/gcd;

    printf("%d %d\n", gcd, lcm);
  }

  return 0;
}

C++: #include <iostream>
using namespace std;

int main() {
	unsigned int a, b;
	while (cin >> a >> b) {
		unsigned int gcd = a, lcm;
		while (a%gcd != 0 || b%gcd != 0) gcd--;
		lcm = (a / gcd)*(b / gcd)*gcd;
		cout << gcd << " " << lcm << endl;
	}
	return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;
int main(void){
	int a,b,x,y,r;
	while(1){
		cin>>a>>b;
		if(cin.eof())	break;
		x=a;	y=b;
		while(1){
			if(b>a)	swap(a,b);
			r=a%b;
			if(r==0)	break;
			a=b;
			b=r;
		}
		cout<<b<<" "<<(long long)x*y/b<<endl;
	}
	return 0;
}

C++: #include<iostream>
#include<cstdio>
#include<algorithm>
#include<cctype>

using namespace std;

long long int gcd(long long int a, long long int b){
	if (a < b)
		swap(a, b);
	if (b == 0)
		return a;
	else 
	return gcd(b, a%b);
}

long long int lcm(long long int c, long long int d){
	return c*d / gcd(c, d);
}

int main(){
	long long int M, N;
	while (cin>>M>>N){
		cout << gcd(M, N) << " " << lcm(M, N) << "\n";
	}
	return 0;
}

C++: #include <iostream>
using namespace std;

int gcd(int a, int b){
	return (b>0)? gcd(b, a%b) : a ;
}
int lcm(int a, int b){
	return (a / gcd(a, b) * b);
}

int main(){
	int a, b;
	
	while( cin >> a >> b ){
		cout << gcd(a,b) << " " << lcm(a,b) << endl;
	}
}

C++: //
//  main.cpp
//  b
//
//  Created by h3037178 on 2017/07/31.
//  Copyright ?? 2017??´ ?????£?????????. All rights reserved.
//

#include<iostream>
#include<iomanip>
#include<cmath>
using namespace std;
int main(){
    long long a,b,s,d;
    while(cin>>a>>b){
        for(int o=2000000;o>0;o--){
            if(a>=20000000||b>=20000000){
                break;
            }
            if(a%o==0&&b%o==0){
                s=o;
                 d=a*b/s;
                cout<<s<<" "<<d<<endl;
                break;
            }
        }
    }
}

C++: #include <cstdio>
#include <iostream>
#include <algorithm>
using namespace std;
 
int main() {
    int n, m;
    while (2 == scanf("%d%d", &n, &m)) {
        printf("%d %d\n", __gcd(n, m), n / __gcd(n, m)*m);
    }
    return 0;
}

C++: #include<cstdio>
#include<iostream>
#include <algorithm>

using namespace std;

int main() {
	long int  a, b;
	while (cin >> a >> b) {
		cout << __gcd(a, b) << " " << a / gcd(a, b) * b << endl;

	}

}

C++: #include <iostream>
using namespace std;

int saidai(long  a,long  b){
	while(b != a){
		if(a > b){
			a -= b;
		}else {
			b -= a;
		}
	}
	return a;
}


long long	saisyou( long  a,long b , long c){
	return a/c*b;
}

int main(){
	long  a,b;
	cin>>a;
	cin>>b;
	long long ans = saidai(a,b);
	cout<<ans<<" "<<saisyou(a,b,ans);;
	return 0;

}

C++: #include<stdio.h>
#include<iostream>
#include<string>
#include<cstdlib>

using namespace std;

int main()
{
	int  a, b, a1, b1, c, g;
	long l;
	
	while (cin >> a >> b)
	{
		a1 = a;
		b1 = b;
		
		if (a == 0 || b == 0)
		{
			break;
		}
		
		else if (a1 == b1)
		{
			g = a1;
			
		}
		else
		{
			while (1)
			{
				c = abs(a - b);
				if (c == 0)
				{
					break;
				}

				if (a > b)
				{
					a = c;
					g = c;
				}
				else if (a < b)
				{
					b = c;
					g = c;
				}
			}
		}
		l = (a1 / g)*b1;

		cout << g << " " << l << endl;

		a1 = a; b1 = b;
	}
}

C++: #include <iostream>
#include <string>
#include <sstream>
#include <vector>

//typedef struct
//{
//    int left_val;
//    int right_val;
//};

class GcdAndLcm
{
public:
    GcdAndLcm() : m_gcd(0), m_lcm(0) {}
    void Run();

private:
    void readData();
    void GetData(std::string s, int& v1, int& v2);
    int calcGcd(int m, int n);
    int calcLcm(int m, int n);
    void Show();

private:
    std::vector<std::string> m_data;
    unsigned int m_gcd;
    unsigned int m_lcm;
};

void GcdAndLcm::Run()
{
    int val1 = 0, val2 = 0;

    readData();
    
    for (unsigned int i = 0; i < m_data.size(); ++i) {
        GetData(m_data[i], val1, val2);
        m_gcd = calcGcd(val1, val2);
        m_lcm = calcLcm(val1, val2);
        Show();
    }
}
void GcdAndLcm::readData()
{
    std::string line;

    while (std::getline(std::cin, line)) {
        m_data.push_back(line);
    }
}

void GcdAndLcm::GetData(std::string s, int& v1, int& v2)
{
    size_t pos = s.find(" ");
    char tmp[100] = { 0 };
    std::strncpy(tmp, s.c_str(), pos);
    v1 = std::atoi(tmp);
    std::memset(tmp, 0x00, sizeof(tmp));
    pos++;
    std::strncpy(tmp, s.c_str() + pos, s.size() - pos);
    v2 = std::atoi(tmp);
}
int GcdAndLcm::calcGcd(int m, int n)
{
    if ((0 == m) || (0 == n))
        return 0;

    while (m != n)
    {
        if (m > n) m = m - n;
        else         n = n - m;
    }
    return m;
}//gcd

int GcdAndLcm::calcLcm(int m, int n)
{
    if ((0 == m) || (0 == n))
        return 0;

    return ((m / calcGcd(m, n)) * n); // lcm = m * n / gcd(m,n)
}//lcm

void GcdAndLcm::Show()
{
    std::cout << m_gcd << " " << m_lcm << std::endl;
}

int main()
{
    GcdAndLcm gcdAndLcm;

    gcdAndLcm.Run();
}