Go: package main

import (
  "fmt"
)

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

func main() {
  var a,b,c int
  for _, err := fmt.Scan(&a, &b); err == nil; _, err = fmt.Scan(&a, &b) {
    c = gcd(a,b)
    fmt.Println(c, a*b/c)
  }
}

C++: #include <stdio.h>

int main(int argc, char *argv[]){
    
    int a, b, r;
    int temp = 0;
    int c, d;
    
    scanf("%d %d", &a, &b);
    c = a;
    d = b;
    if(a < b){
        temp = a;
        a = b;
        b = temp;
    }
    
    r = a % b;
    while(r != 0){
        a = b;
        b = r;
        r = a % b;
    }
    
    printf("%d %d\n", b, (int)((double)c/b*d));
    
    return 0;
}

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

int main(){

	int a, b;

	while(std::cin >> a >> b){

		long int minmul = a * b; //least common multiple
		int maxdivi = 1; //greatest common divisor

		if(a == 0 || b == 0){
			std::cout << 0 << " " << 0 << std::endl;

		}else{					//Euclidean Algorithm

			if(b > a)
				std::swap(a, b);

			while(a % b != 0){
				a = a % b;
				if(b > a)
					std::swap(a, b);
			}
		
		maxdivi = b;
		minmul = minmul / maxdivi;

		std::cout << maxdivi << " " << minmul << std::endl;
		}
	}

	return 0;
}

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

int gcd(int a, int b) {
	if (b == 0)return a;
	return gcd(b, a%b);
}
int main() {
	vector<int>a(2);
	while (cin >> a[0] >> a[1]) {
		sort(a.begin(), a.end());
		int b = gcd(a[1], a[0]);
		cout << b << " " << a[1] * a[0] / b << endl;
	}
}

C++: #include<iostream>
#include<list>
#define MAX(a,b) ((a) > (b) ? (a) : (b))
#define MIN(a,b) ((a) > (b) ? (b) : (a))
using namespace std;


int main(){
	long a,b,r,x,y;
	list<long> aby;
	
	while(!(cin>>a>>b).eof()){
		x=a,y=b;
		while(1){
			r=MAX(x,y)%MIN(x,y);
			if(r==0) break;
			x=MIN(x,y);
			y=r; 
		}
		aby.push_back(a);
		aby.push_back(b);
		aby.push_back(y);
		
	}
	list<long>::iterator it = aby.begin();
	while(it != aby.end()){
		a = *it, it++;
		b = *it, it++;
		y = *it;
		cout << y << " "<<(a*b)/y <<endl;
		it++;
	}
	
	return 0;
}

C++: #include <iostream>
#include <string>
#include <stack>
#include <math.h>
#include <algorithm>
#include <cstdlib>
#include <ctime>
#include <vector>

using namespace std;

int gcm(int n, int m) {
	if (n == 0) return m;
	else return gcm(m%n, n);
}



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





}

C++: #include <iostream>

using namespace std;

int a, b;
int g, l;

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

int main(void)
{
	while(1){
		cin >> a;
		if(cin.eof()) break;
		cin >> b;
		
		g = gcd(a, b);
		l = a / g * b;
		cout << g << " " << l << endl;
	}
	return 0;
}

C++: #include<cstdio>
#include<iostream>
     
using namespace std;
    
int gcd(int a, int b){

  if(b == 0)  return a;

  return gcd(b, a % b);
}
     
int lcm(int a, int b, int ans_gcd) {
  int ans;
  
  ans = a / ans_gcd * b;

  return ans;
}
     
     
     
     
int main(){
  int a, b;
  int ans_gcd, ans_lcm;

  while (1){//cin >> a >> b) {
    cin >> a >> b;
    if((a == 0) && (b == 0)) break;

    ans_gcd = gcd(a, b);
    ans_lcm = lcm(a, b, ans_gcd);

    cout << ans_gcd << " " << ans_lcm << endl;
  }

  return 0;
}

C++: #include <iostream>
 
typedef unsigned int ui;
 
void swap(ui & a, ui & b)
{
    unsigned int tmp = a;
    a = b;
    b = tmp;
}
 
ui gcd(ui a, ui b)
{
    if (a < b) swap(a, b);
 
    ui c = a % b;
    while (c != 0) {
        a = b;
        b = c;
        c = a % b;
    }
 
    return b;
}
 
int main() {
    using namespace std;
 
    ui a, b;
    while (cin >> a >> b) {
        const ui GCD = gcd(a, b);
        const ui LCM = a * (b / GCD);
        cout << GCD << ' ' << LCM << endl;
    }
    return 0;
}

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

int main()
{
	int a, b;
	int temp;
	while (cin >> a >> b)
	{
		if (a < b)
		{
			temp = a;
			a = b;
			b = temp;
		}
		int a_ = a, b_ = b;
		while (a_ % b_ != 0)
		{
			temp = a_ % b_;
			a_ = b_;
			b_ = temp;
		}
		cout << b_ << " " << b / b_ * a << endl;
	}

	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
#define rep(i,a,n) for (int i=a;i<n;i++)
#define per(i,a,n) for (int i=n-1;i>=a;i--)
#define pb push_back
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define fi first
#define se second
#define SZ(x) ((int)(x).size())
typedef vector<int> vii;
typedef long long ll;
typedef pair<int,int> pii;
const ll mod=1000000007;
ll powmod(ll a,ll b) {ll res=1;a%=mod; assert(b>=0); for(;b;b>>=1){if(b&1)res=res*a%mod;a=a*a%mod;}return res;}
ll gcd(ll a,ll b) { return b?gcd(b,a%b):a;}
// head
long long a,b;
long long GCD,LCM;
int main()
{
    while(~scanf("%lld %lld",&a,&b))
    {
        GCD=gcd(a,b);
        LCM=a/GCD*b;
        printf("%lld %lld\n",GCD,LCM);
    }
}

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;
}

C++: #include <stdio.h>

int main( ){
    float a[20],b[20];
    int nCount;
    for( int i = 0;scanf( "%f %f",&a[i],&b[i] ) != EOF;i++ ) nCount = i;

    for( int k = 0;k < i;k++ ){
         float buf_a = a[k],buf_b = b[k];

        while( buf_a != buf_b ){
            if( buf_a < buf_b ) buf_a += a[k];
            else                      buf_b += b[k];
        }
        printf( "%d ",( int )buf_a );
        int m,n;
        if( a[k] < b[k] ) m = b[k],n = a[k];
        else if( a[k] > b[k] ) n = b[k],m = a[k];
        else {
            printf( "%d\n",a[k] );
            continue;
        }
        while( true ){
            int buf = n;
            n = m % n;
            m = buf;
            if( n == 0 ) {
                printf( "%d\n",m );
                break;
            }
        }
    }
    return 0;
}

C++: //C++14 (Clang 3.8.0)

#include <vector>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <string>
using namespace std;
typedef pair<int,int> P;
typedef unsigned long long ll;
ll gcd(ll x,ll y){
    ll ma=max(x,y),mi=min(x,y),ama=ma%mi;
    if(ama==0) return mi;
    else return gcd(mi,ama);
}
ll lcm(ll x,ll y){
    ll g=gcd(x,y);
    if(g==1) return x*y;
    return g*lcm(x/g,y/g);
}
int main(){
    ll a,b;
    while(scanf("%lld %lld", &a, &b)!=EOF){
        cout<<gcd(a,b)<<" "<<lcm(a,b)<<endl;
    }
    return 0;
};