Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

var sc = bufio.NewScanner(os.Stdin)
var out = bufio.NewWriter(os.Stdout)

func main() {
	sc.Split(bufio.ScanLines)
	defer out.Flush()

	for sc.Scan() {
		a, b := nextInts()
		x, y := gcd(a, b), lcm(a, b)
		fmt.Fprintf(out, "%d %d\n", x, y)
	}

}

func nextInts() (a, b int) {
	s := strings.Split(sc.Text(), " ")
	ra, _ := strconv.Atoi(s[0])
	rb, _ := strconv.Atoi(s[1])
	a = ra
	b = rb
	return
}

func gcd(x, y int) int {
	if x < y {
		gcd(y, x)
	}
	for 0 < y {
		r := x % y
		x, y = y, r
	}
	return x
}

func lcm(x, y int) int {
	return (x * y) / gcd(x, y)
}

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

long long GCD (long long a, long long b)
{
    long long t;
    if (a>b) swap(a,b);
    while (1)
    {
        t=b%a;
        if (t==0) break;
        b=a;
        a=t;
    }
    return a;
}

int main()
{
    long long a,b,gcd[50],lcm[50],c=0;
    while (cin>>a>>b)
    {
        gcd[c]=GCD(a,b);
        lcm[c]=a*b/gcd[c];
        c++;
    }
    for (int i=0; i<c; i++) cout<<gcd[i]<<" "<<lcm[i]<<'\n';
    return 0;
}

C++: /*
练习题：GCD and LCM_AOJ 0005
	此题拓展了LCM(the least common multiple)的求法。 
*/ 

#include <cstdio>
#include <iostream>
using namespace std;

int a, b;

long long gcd(long long a, long long b)
{
	if(b==0)
		return a;
	return gcd(b, a%b);
}

int main()
{
	while(scanf("%lld%lld", &a, &b)!=EOF)
	{
		long long g=gcd(a, b);
		printf("%lld ", g);
		printf("%lld\n", a/g*b);//注意这里先做除法！ 
		
	}
	
	return 0;
}

C++: /*
 0005-GCD_and_LCM.cpp
 
 http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=0005
 */

#include<iostream>
#include<algorithm>

using namespace std;

int main(){
    int a,b;
    while(cin>>a>>b){
        long int temp_a = a;
        long int temp_b = b;
        while(1){
            long int l = max(temp_a,temp_b);
            long int r = min(temp_a,temp_b);
            
            if(l==r){
                cout<<l<<" "<<a/l * b/l * l <<endl;
                break;
            }else{
                l = l-r;
                temp_a = l;
                temp_b = r;
            }
        }
    }
}

C++: #include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define fi first
#define se second
#define vec vector
const int INF=0x3f3f3f3f;
#define N int(5e5+5)

ll gcd(ll a,ll b){
	if(a<b)swap(a,b);
	while(a%b){
		ll t=a%b;
		a=b;
		b=t;
	}
	return b;
}
int main(){
	ios::sync_with_stdio(false);
	ll a,b;
	while(cin>>a>>b){
		ll g=gcd(a,b);
		ll lcm=g*(a/g)*(b/g);
		cout<<g<<' '<<lcm<<endl;
	}
	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
using ll = long long;
using P = pair<ll, ll>;
ll GCD(ll a, ll b) { return b?GCD(b, a%b):a; }
ll LCM(ll a, ll b) { return a/GCD(a, b)*b; }


int main() {
    ll a, b;
    while(cin >> a >> b) {
        cout << GCD(a, b) << " " << LCM(a, b) << endl;
    }
}

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

int gcd(int a, int b)
{
	return b == 0 ? a : gcd(b, a%b);
}

int main()
{
	int a, b;
	while (cin >> a >> b){
		cout << gcd(a, b) << " " << a / gcd(a, b)*b << endl;
	}
	return 0;
}

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

int main(void){
    long long a,b,c,d,x,ans01,ans02;
    int count;
    while(std::cin >> a >> b && count <= 50){
        if(b > a){
           x = a;
           a = b;
           b = x;
        }
        c = a % b;
        d = b % c;
        if(d == 0) {
            ans01 = c;
            ans02 = a * b / c;
        }
        else if (c % d == 0) {
            ans01 = d;
            ans02 = a * b / d;
        }
        std::cout << ans01 << " " << ans02 << std::endl;
        count ++;
    }
    return 0;
}

C++: #include <iostream>
#include <cstdio>
using namespace std;
#define REP0(i,n) for(int i=0;i<n;++i)
#define REP1(i,n) for(int i=1;i<=n;++i)
#define ALL(c) (c).begin(),(c).end()
typedef long long ll;
ll gcd(ll a,ll b){
	while(b>0){
		if(a>b) swap(a,b);
		b%=a;
	}
	return a;
}
int main(){
	ll a,b;
	while(scanf("%lld%lld",&a,&b)!=EOF) printf("%lld %lld\n",gcd(a,b),a/gcd(a,b)*b);
	return 0;
}

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

using namespace std;

long int  a, b;
long int gcd, lcm;

void GCD(){

	int big, small;

	big = a;
	small = b;

	while (big) {
		if (small > big) swap(big, small);
		big = big % small;
	}
	gcd = small;

}

void LCM() {
	lcm = a * b / gcd;
}




int main(){
	while (cin >> a >> b) {

		GCD();
		LCM();
		cout << gcd << " " << lcm << endl;
	}
	return 0;
}

C++: #include<iostream>

int main(){
	int a,b;
	
	while( std::cin >> a >> b ){
		int num1 = a;
		int num2 = b;
	
		if( a<b ){
			num2 = a;
			num1 = b;
		}
		
		while( (int gcd = num1%num2) != 0){
			num1 = num2;
			num2 = gcd;
		}
		gcd = num2;
		int lcm = a / gcd * b;
		std::cout << gcd <<" "<< lcm << "\n";
	}
	
	return 0;
}

C++: #include <iostream>

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

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

int main(){
    int a,b;
    while(std::cin >> a >> b){
        if(a == -1 or b == -1)  break;
        std::cout << gcd(a, b) << " " << lcm(a, b) << std::endl;
    }
    return 0;
}

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

long long gcd(long long a, long long b)
{
	if (b == 0) return a;
	return gcd(b, a % b);
}

long long lcm(long long a, long long b)
{
	return a * b / gcd(a, b);
}

int main()
{
	long long a, b;
	while (cin >> a >> b)
		cout << gcd(a, b) << " " << lcm(a, b) << endl;
	return 0;
}

C++: #include<iostream>
using namespace std;
int main(void)
{
    int a,b,fl;
    while(cin>>a>>b)
    {
        fl=0;
        for(int i=1;fl==0;i++)
        {
            if(a%i==0&&b%(a/i)==0)
            {
                cout<<a/i<<" ";
                fl++;
            }
            else;
        }
        fl=0;
        for(int i=1;fl==0;i++)
        {
            if(b%(a*i)==0)
            {
                cout<<a*i<<endl;
                fl++;
            }
            else;
        }
    }
    return 0;
}

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

using namespace std;


int calcMax(int a, int b) {
	int tmp;
	if (a > b) {
		while (b != 0) {
			tmp = b;
			b = a % b;
			a = tmp;
		}
		return a;
	}
	else {
		while (a != 0) {
			tmp = a;
			a = b % a;
			b = tmp;
		}
		return b;
	}
}

int calcMin(int a, int b) {
	int max_common = calcMax(a, b);
	return (a / max_common)*b;
}


int main() {
	int a, b;
	while (scanf("%d %d", &a, &b) != EOF) {
		printf("%d %d\n", calcMax(a, b), calcMin(a, b));
	}

	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
int main(){
  int a,b;
  int are;
  int i;
  int cgd,lcm;
  while(1){
    cin >> a >> b;
    if(a == 0 && b == 0)break;
    if(a == b){
      cout << a << " " << a << endl;
      continue;
    }
    if(a > b){
      int temp = b;
      b = a;
      a = temp;
    }
    cgd = 1;
    for(i = 2;i <= a && i < 65536;i++){
      if(a % i == 0 & b % i == 0){
	cgd = i;
      }
    }
    for(i = b;i < 2147483647;i += b){
      if(i % a == 0 && i % b == 0){
	lcm = i;
	break;
      }
    }
    cout << cgd << " " <<  lcm << endl;
  }
}

C++: #include<iostream>
using namespace std;
int main(){
	int a,b,d=0,c,e;
	while(cin>>a>>b){
		c=a;
		e=b;
		if(a<b){
			d++;
		}
		while(a!=0&&b!=0){
			if(d%2==0){
				a%=b;
			}else{
				b%=a;
			}
			d++;
		}
		cout<<a+b<< " " <<c*(e/(a+b))<<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<<" "<<x*y/b<<endl;
	}
	return 0;
}