Go: package main

import "fmt"

func main() {
	var gcdArr, lcmArr [50]int
	var count int
	for {
		var x, y int
		fmt.Scanf("%d %d", &x, &y)
		if x < y {
			rep := x
			x, y = y, rep
		}
		gcd := x % y
		lcm := x * y
		for gcd != 0 {
			x, y, gcd = y, gcd, x%y
		}
		gcdArr[count] = y
		lcmArr[count] = lcm / y
		count++
	}
	for i := 0; i < count; i++ {
		fmt.Printf("%d %d\n", gcdArr[i], lcmArr[i])
	}
}

C++: /********************************************************************
 * ??£?????´??° a,b ?????\?????????a ??¨ b ????????§??¬?´???°??¨????°???¬?????°???????????????
 * ????????°?????????????????????????????????
 ********************************************************************/
#include <iostream>
#include <cstring>
typedef struct _input_values {
    int a;
    int b;
} INPUT_VALUES;

typedef struct _input_values_list {
    INPUT_VALUES sList[10];
    int effectCount;
} INPUT_VALUES_LIST;

int gcd( int a, int b );    // ?????§??¬?´???°????±???????
int lcm( int a, int b, int g );    // ????°???¬?????°????±???????

using namespace std;

int main()
{
    int i = 0;
    int tA = 0, tB = 0;
    int g = 0, l = 0;
    static INPUT_VALUES_LIST values;

    memset( &values, 0, sizeof(values) );

    while( cin >> tA >> tB ) {
        values.sList[values.effectCount].a = tA;
        values.sList[values.effectCount].b = tB;
        values.effectCount++;
    }

    for ( i = 0; i < values.effectCount; i++ ) {
        g = gcd( values.sList[i].a, values.sList[i].b );
        l = lcm( values.sList[i].a, values.sList[i].b, g );
        cout << g << " " << l << endl;
    }

    return 0;
}

/*  @brief  ?????§??¬?´???°????±???????
 *  @param  [i] a   ???????????????
 *  @param  [i] b   ???????????????
 *  @retval ?????§??¬?´???°
 */
int gcd( int a, int b )
{
    int ret = 0;

    if ( 0 == a || 0 == b ) {
        return 0;
    }

    if ( a != b ) {
        if ( a > b ) {
            a = a - b;
        } else {
            b = b - a;
        }
    } else {
        return a;
    }

    ret = gcd( a, b );

    return ret;
}

/*  @brief  ????°???¬?????°????±???????
 *  @param  [i] ???????????????
 *  @param  [i] ???????????????
 *  @param  [i] ?????§??¬?´???°
 *  @retval ????°???¬?????°
 */
int lcm( int a, int b, int g )
{
    if ( 0 == a || 0 == b ) {
        return 0;
    }

    return ( a * b / g );
}

C++: #include <iostream>

//最大公約数を求めるプログラム(m >= n)
int calcGcd(int m, int n);
//最小公倍数を求めるプログラム
inline int calcLcm(int m, int n, int gcd);

int main(){
	int gcd, lcm, x, y;
	
	while(std::cin >> x >> y){
		if(x > y) gcd = calcGcd(x, y);
		else gcd = calcGcd(y, x);
		lcm = calcLcm(x, y, gcd);
		
		std::cout << gcd << " " << lcm << std::endl;
	}
	
	return 0;
}

int calcGcd(int m, int n){
	return n == 0 ? m : calcGcd(n, m%n);
}

inline int calcLcm(int m, int n, int gcd){
	return m / gcd * n;
}

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



long long gcm(long long a, long long b){
	if(b > a){
	long long d;
	d = a;
	a = b;
	b = d;
	}	
	long long c;
	while(b!=0){
		c = a % b;
		a = b;
		b = c;
	}
	return a;
}
int main(){
	for(int i=1;i<=2;i++){
	long long c,d,e;
	std::cin>>c>>d;
	e = gcm(c,d);
	std::cout<<e<<" "<<((c/e)*(d/e)*e)<<endl;
	}
}

C++: #include <iostream>

using namespace std;

int gcd(int i, int j);

int main()
{
	
	int i,j;
	while(cin >> i >> j){
		int tmp;
		if(i>j){
			tmp = i;
			i = j;
			j = tmp;
		}
		int ret_gcd, ret_lcm;
		ret_gcd = gcd(i,j);
		ret_lcm = (i*j)/ret_gcd;
		
		cout << ret_gcd << ' ' << ret_lcm <<endl;
		
	}
	return 0;
}

int gcd(int i, int j)
{
	if(i % j ==0){
		return j;
	}
	
	i %= j;
	int tmp;
	tmp = i;
	i = j;
	j = tmp;
	return gcd(i, j);
}

C++: #include<iostream>
#include<algorithm>
using namespace std;
int gcd(int a,int b)
{
    if(b==0)
        return a;
    else
        return gcd(b,a%b);
}
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;
    }
    return 0;
}

C++: #include <iostream>
#include <vector>
#include <algorithm>
#include <fstream>
#include <sstream>
#include <string>
#include <iomanip>
#include <math.h>
#include <limits>

using namespace std;

typedef unsigned long long ullong;

class cgl
{
public:
	ullong gcd(ullong, ullong);
	ullong lcm(ullong, ullong, ullong);
};

ullong cgl::gcd(ullong a, ullong b)
{
	if (a % b == 0)
		return b;
	return gcd(b, a % b);
}

ullong cgl::lcm(ullong a, ullong b, ullong g)
{
	return a * b / g;
}

int main()
{
	cin.tie(0);
	ios::sync_with_stdio(false);

	cgl cg;
	ullong a, b, g;

	for (;;)
	{
		cin >> a >> b;
		if (cin.fail()) break;
		g = cg.gcd(a, b);
		cout << g << " " << cg.lcm(a, b, g) << endl;
	}

	return 0;
}

C++: #include <cstdio>
using namespace std;
long long int gcd(long long int m,long long int n)
{
	if (n == 0)
		return m;
	return gcd(n,m % n);
}

int main()
{
	long long int a, b;
	while (scanf("%lld %lld",&a,&b) != EOF) {
		if (a >= b)
			printf("%lld %lld\n",gcd(a, b),a*b/ gcd(a, b));
		else
			printf("%lld %lld\n", gcd(b, a), a*b / gcd(b, a));
	}
	return 0;
}

C++: #include <iostream>

using namespace std;

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

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

using namespace std;

int gcd(int a ,int b);
int lcm(int a,int b);

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

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

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

C++: #include<iostream>
using namespace std;
long long int gcd(long long int a, long long int b)// greatest common divisor 
{
	if (b == 0) {
		return a; 
	}
	return gcd(b, a%b);
}

long long int lcm(long long int a, long long int b)// least common multiple
{
	return a * b / gcd(a, b);
}

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

C++: #include<iostream>

using namespace std;

int GCD(int a, int b){
  return !b ? a : GCD(b, a%b);
}

int main(void){
  long long a,b,gcd,lcm;

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

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

int main() {
    
    int a,b;
    while(cin >> a >> b){
        for(int i = a;i > 1;i--){
            if(b%i == 0 && a%i == 0){
                cout << i << "\n";
                break;
            }
        }
        for(int i = a;i < 2000000000;i++){
            if(i%a == 0 && i%b == 0){
                cout << i << "\n";
                break;
            }
        }
    }
    
return 0;
}

C++: #include "stdio.h"

int main()
{
	int a, b, x, y;

	while(scanf("%d %d", &a, &b) != EOF){
		if(a < b) {int t; t = a; a = b; b = t;}

		for(int i = a-b; i > 0; i--){
			if(a%i == 0 && b%i == 0) {x = i; break;}
		}

		y = a/x*b;

		printf("%d %d\n", x, y);
	}

	return 0;
}

C++: #include <iostream>

using namespace std;
//辗转相除法求解a,b的最大公约数，使用前a、b请自行取绝对值
int gcd(long long a,long long b)
{
    if(b==0) return a;
    return gcd(b,a%b);
}

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

C++: #include<cstdio>
int a,b,t;int g(int a,int b){return b?g(b,a%b):a;}
main(){while(~scanf("%d%d",&a,&b))printf("%d %d\n",t=g(a,b),a/t*b);}

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

typedef long long ll;

ll GCD(ll a, ll b) {
    if(b == 0)
	return a;
    return GCD(b,a%b);
}


ll LCM(ll a, ll b) {
    
    ll G = GCD(a,b);

    return a/G * b/G * G;

}

int main() {

    ll a,b;

    while(cin >> a >> b) {

	cout << GCD(a,b) << " " << LCM(a,b) << endl;
    }

    return 0;
}