Go: package main

import "fmt"

func main() {
	var a, b int
	var gcd, lcm int

	for {
		_, err := fmt.Scanf("%d %d", &a, &b)
		if err != nil {
			return
		}

		var big, small int
		// GCD
		if a > b {
			big = a
			small = b
		} else {
			big = b
			small = a
		}

		for {
			if big%small == 0 {
				gcd = small
				break
			} else {
				small, big = big%small, small
			}
		}

		// LCM
		lcm = a * b / gcd

		fmt.Println(gcd, lcm)
	}
}

C++: #include <stdio.h>
#include <math.h>

int u(int a, int b);
int l(int a, int b, int gcd);

int main(){
  int a, b;
  int gcd, lcm;
  
  while(scanf("%d", &a)!=EOF){
    scanf("%d", &b);
    gcd = u(a, b);
    lcm = l(a, b, gcd);
    std::cout << gcd << " " << lcm << std::endl;
  }
  
  return 0;
}

int u(int a, int b){
  while(1){
    if(a==1) return b;
    else     return a;
    if(a>=b){
      a = a % b;
    }else{
      b = b % a;
    }
  }
  
}

int l(int a, int b, int gcd){
  return a * b / gcd;
}

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

int main() {
	int a, b,i;
		while (cin >> a >> b) {
			if (a > b)
				i = b;
			else
				i = a;
			for (; i > 0; i--) {
				if (b%i == 0 && a%i == 0) {
					cout << i << " ";
					break;
				}
				//if (i == 0)
					//cout << 1 << " ";
			}
			if (a > b)
				i = a;
			else
				i = b;
			if (a > b) {
				for (i = a; i%b; i += a);
				cout << i << endl;
			}
			else {
				for (i = b; i%a; i += b);
				cout << i << endl;
			}
		}
	return 0;
}

C++: int gcd(int x,int y){
	if(y==0)return x;
	else return gcd(y,x%y);
}
int main(){
	for(int i=0;i<5;i++){
		int a,b;
		std::cin>>a>>b;
		std::cout<<gcd(a,b)<<" "<<a/gcd(a,b)*b<<std::endl;
		
	}
	return 0;
}

C++: #include <cstdio>
	int m, n;
int GCD(int m, int n)
{
    while( 1 )
    {
        m = m % n;
		if( m == 0 )
			return n;
		n = n % m;

        if( n == 0 )
			return m;
    }
}
int LCM( int m, int n )
{
		
	return ((m / GCD(m, n)) * n); // lcm = m * n / gcd(m,n)
}
int main()
{
	while(scanf("%d%d",&m,&n)!=EOF)
	{

		printf("%d %d",GCD(m,n),LCM(m,n));
	}
	return 0;
}

C++: #include <iostream>			//std::cout, std::cin
#include <string>			//std::string,std::to_string(C++11)
#include <vector>			//std::vector
#include <valarray>			//std::valarray
#include <algorithm>		//std::sort
#include <ctime>			//localtime_s
#include <cstdlib>			//abs
#include <cmath>			//abs,std::pow,sqrt,sin,cos,round,floor,ceil
#include <fstream>			//std::ifstream,std::ofstream
#include <iomanip>			//std::setprecision,std::setw,std::setfill
#include <random>			//std::random(C++11)
#include <numeric>			//std::accumulate
#include <functional>		//std::greater
#include <chrono>			//std::chrono(C++11)
#include <bitset>			//std::bitset
#include <queue>			//std::queue

const static double	de_PI	= 3.14159265358979323846;
const static int	de_MOD	= 1000000007;
const static int	de_MAX	= 999999999;

int Greatest_Common_Divisor(int a, int b) {

	while (a != 0 && b != 0) {
		if (a > b) {
			a = a - b;
		}
		else {
			b = b - a;
		}
	}
	return(a + b);
}

int main(void) {

	//std::ifstream in("123.txt");	std::cin.rdbuf(in.rdbuf());
	//std::ofstream ofs("456.csv");
	//std::chrono::system_clock::time_point t_st = std::chrono::system_clock::now();

	unsigned int a = 0, b = 0;
	std::vector<unsigned int> GCD;
	std::vector<unsigned long long> LCM;

	while (std::cin >> a) {
		std::cin >> b;
		GCD.push_back(Greatest_Common_Divisor(a, b));
		unsigned long long c = a*b;
		LCM.push_back(c / GCD.back());
	}

	for (unsigned int i = 0; i < GCD.size(); i++) {
		std::cout << GCD[i] << " " << LCM[i] << std::endl;
	}

	//std::chrono::system_clock::time_point t_ed = std::chrono::system_clock::now();
	//std::cout << std::chrono::duration_cast<std::chrono::milliseconds>(t_ed - t_st).count() << "ms" << std::endl;

}

C++: #define _CRT_SECURE_NO_WARNINGS
#include<bits/stdc++.h>
using namespace std;
#ifndef FAST_IO
 #define IOS ios_base::sync_with_stdio(false);cin.tie(nullptr);
#endif

#define FILE_IO freopen("input.txt","r",stdin)
#define int long long
#define f first
#define s second
#define endl '\n'
#define all(c) c.begin(),c.end()
#define bp __builtin_popcount
#define debug(x) cerr << #x << " = " << x << endl;

const int MOD = 1e9 + 7;
const int INF = 1e18;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
template <typename T>void print(T t){for(auto &it : t)cout<<it<<" ";}
inline int powerexp(int a, int b, int m = MOD){ int res = 1;while(b){if(b&1)res = res * a % m;a = a * a % m,b >>= 1;}return res % m;}
inline int modinv(int a){ return powerexp(a,MOD-2,MOD);}
inline int lcm(int a, int b){ int g = __gcd(a,b);return a/g*b;}
inline int add(int x, int y){ x += y; if (x >= MOD) x -=  MOD; return x;}
inline int mul(int x, int y){ return (x * 1ll * y) % MOD;}
inline int sub(int x, int y){ x -= y; if (x<0) x += MOD; return x ;}

//-------------------< start here >-------------------------// 

void solve(){
    int a, b;
    while(cin >> a >> b){
    cout << __gcd(a, b) <<  " " << lcm(a, b) << endl;
    }
}

//-----------------------------
//comment from here for TOPCODER 
int32_t main(){
   IOS;
   solve();
   //find();
   #ifdef LOCAL_DEFINE
   cerr << "time elapsed " << (double)clock()/CLOCKS_PER_SEC << endl;
   #endif
}

C++: #include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
#include <iomanip>
#include <utility>
typedef unsigned long ul;

using namespace std;

int gcd(ul a, ul b);

int main(){
	ul a, b, gcd_num;
	while(cin >> a >> b){
		if(a < b){
			swap(a,b);
		}
		gcd_num = gcd(a, b);
		cout << gcd_num << " " << (a*b)/gcd_num << endl;
	}
}

int gcd(ul a, ul b){
	ul r;
	while((r = a % b) != 0){
		a = b;
		b = r;
	}
	return b;
}

C++: #include<iostream>
#include<algorithm>
typedef unsigned long long ll;
using namespace std;
ll gcd(ll a,ll b)
{
    if(a<b) swap(a,b);
    if(b==0) return a;
    else if(a&1&&b&1) return gcd(b,(a-b)>>1);
    else if(a&1&&b) return gcd(a,b>>1);
    else if(a&&b&1) return gcd(a>>1,b);
    else return 2*gcd(a>>1,b>>1);
}
int main(void)
{
    ll a,b;
    while(cin>>a>>b) {
        cout<<gcd(a,b)<<' '<<a*b/gcd(a,b)<<endl;
    }
    return 0;
}

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

using namespace std;

int getLCM(int, int);
int getGCD(int, int, int);

int main(int argc, char *argv[]) {
  int x, y;
  vector<int> result;

  while (cin >> x >> y) {
    int lcm = getLCM(x, y);
    int gcd = getGCD(x, y, lcm);
    result.push_back(lcm);
    result.push_back(gcd);
  }
  for (int i = 0; i < result.size()/2; i++)
    cout << result[i*2] << ' ' << result[i*2+1] << endl;
  return 0;
}

int getLCM(int x, int y) {
  int tmp;

  if (x < y) {
    tmp = y;
    y = x; 
    x = tmp;
  }
  while (x % y != 0) {
    tmp = x % y;
    x = y;
    y = tmp;
  }
  return y;
}


int getGCD(int x, int y, int lcm) {
  x /= lcm;
  y /= lcm;
  return x * y * lcm;
}

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

int get_gcd(int a, int b) {
  int r;
  while (r = a % b) {
    a = b;
    b = r;
  }
  return b;
}

int main() {
  int a, b;
  while (~scanf("%d %d", &a, &b)) {
    int gcd = get_gcd(a, b);
    int lcm = a / gcd * b;
    printf("%d %d\n", gcd, lcm);
  }
}

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

int SKB(double x, double y, double w){
	double n = (x*y)/w;
	return (int)n;
}

int YUK(int x, int y){
	int c;
		c = x%y;
		if(c == 0){
			return y;
		}else{
			return YUK(y,c);
		}
}

int main(){
	int a, b;

	while( cin >> a >> b ){
		int d;
		if(a >= b){
			d = YUK(a,b);
			cout << d << ' ' << SKB(a,b,d);

		}else{
			d = YUK(b,a);
			cout << d << ' ' << SKB(a,b,d);
		}
		cout << '\n';
	}

	return 0;
}