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 count == 51 {
			break
		}
		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++: #include <iostream>
using namespace std;

int GCD(int c, int d){
    if(c%d == 0){
        return d;
    }
    else{
        return GCD(d, c%d);
    }
}

int main(void){
    long int a, b;
    while(cin >> a >> b){
        if(a < b){
            int x = a;
            a = b;
            b = x;
        }
        long int gcd_a_b = GCD(a, b);
        cout << gcd_a_b << " " << a*b/gcd_a_b << endl;
    }
    return 0;
}

C++: #include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <queue>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <complex>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include <fstream>
#include <stdio.h>

using namespace std;

//conversion
//------------------------------------------
inline int toInt(string s) {int v; istringstream sin(s);sin>>v;return v;}
template<class T> inline string toString(T x) {ostringstream sout;sout<<x;return sout.str();}

//typedef
//------------------------------------------
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<double> VEC;
typedef vector<VEC> MAT;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef pair<int, PII> TIII;
typedef long long LL;
typedef vector<LL> VLL;
typedef vector<VLL> VVLL;
//container util

//------------------------------------------
#define ALL(a)  (a).begin(),(a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define PB push_back
#define MP make_pair
#define SZ(a) int((a).size())
#define EACH(i,c) for(typeof((c).begin()) i=(c).begin(); i!=(c).end(); ++i)
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define SORT(c) sort((c).begin(),(c).end())
#define MT(a,b,c) MP(a, MP(b, c))
#define T1 first
#define T2 second.first
#define T3 second.second.first
#define T4 second.second.second

//repetition
//------------------------------------------
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)
#define EPS 1.0e-9

LL gcd(LL m, LL n){
	LL t;
	while(m){
		t = m;
		m = n % m;
		n = t;
	}
	return n;
}

LL lcm(LL m, LL n){	
	LL g = gcd(m, n);
	return m / g * n;
}

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

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

int main(){
  unsigned int a,b,tmp,GCD;
  while ( std::cin >> a >> b){
   unsigned long int LCM = a;
    if( b > a )std::swap( a , b );
    GCD = b;
    while(a % GCD != 0){
      tmp = a % GCD;
      a = GCD;
      GCD = tmp;
    }
    LCM = ( LCM / GCD ) * b;
    std::cout << GCD << " " << LCM << std::endl;
  }
  return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll gcd(ll x, ll y){
	if(y == 0) return x;
	else return gcd(y, x % y);
}

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

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

using namespace std;

int a,b;

void search(int t)
{
	int r;
	
	if(r==0)
		return;
	
	if(t==1)
	{
		r=a%b;
		a=r;
		search(t=0);
	}
	else
	{
		r=b%a;
		b=r;
		search(t=1);
	}
	
}

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

int main()
{
	int a2,b2;
	
	for(;cin >> a;)
	{
		cin >> b;
/*		a2=a;
		b2=b;
		
		a=max(a2,b2);
		b=min(a2,b2);
		
		search(1);
		
		a=max(a,b);
		
		cout << a << " " << a2*(b2/a) << endl;
*/
		int gcd = GCD( a, b );
		cout << gcd << " " << a/gcd * b << endl;
	}
}

C++: #include <iostream>

using namespace std;

int gcd(long long a, long long b) {
  while (!a == 0 && !b == 0) {
    if (a >= b) {
      a %= b;
    } else {
      b %= a;
    }
  }
  if (a == 0) {
    return b;
  } else {
    return a;
  }
}

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

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

typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> veci;
typedef vector<ll> vecll;
typedef vector<string> vecs;
template<class T,class U> using Hash=unordered_map<T,U>;

#define REP(i, a, n) for(ll i = a; i < (ll)n; i++)
#define RREP(i, a, n) for(ll i = n-1; i >= (ll)a; i--)
#define rep(i, n) REP(i, 0, n)
#define rrep(i, n) RREP(i, 0, n)
#define MD 1000000007

template<class T> T read(){T a;cin >> a;return a;}
template<class T> void read(T& a){cin >> a;}
template<class T, class ...Args> void read(T& a, Args&... args){cin >> a; read(args...);} 
template<class T> void rarr(T a, int n){for(int i = 0; i < n; i++) {cin >> a[i];}}
template<char c = ' ',class T> void write(T a){cout << fixed << setprecision(4) << a << endl;}
template<char c = ' ',class T,class ...Args> void write(T a, Args... args){cout << fixed << setprecision(4) << a << c; write<c>(args...);}
template<class T> void warr(vector<T> a, const char* c = " "){cout << a[0];for(int i = 1; i < (int)a.size(); i++)cout << c << a[i];cout << endl;;}
template<class T> void warr(T a, int n, const char* c = " "){cout << a[0];for(int i = 1; i < n; i++)cout << c << a[i];cout << endl;}
void split(string s, string delim, veci& result){result.clear();string::size_type pos = 0;while(pos != string::npos){string::size_type p = s.find(delim, pos);if(p == string::npos){result.push_back(atoi(s.substr(pos).data()));break;}else {result.push_back(atoi(s.substr(pos, p - pos).data()));}pos = p + delim.size();}}
void split(string s, string delim, vecs& result){result.clear();string::size_type pos = 0;while(pos != string::npos){string::size_type p = s.find(delim, pos);if(p == string::npos){result.push_back(s.substr(pos));break;}else {result.push_back(s.substr(pos, p - pos));}pos = p + delim.size();}}
ll gcd(ll a, ll b){while(true){ll k = a % b;if(k == 0)return b;a = b;b = k;}}
ll comb(ll n, ll m){ll p=1;m=min(m,n-m);for(ll i=1;i<=m;i++){p*=n-i+1;p/=i;}return p;}

int main(void)
{
    while(!cin.eof()){
        ll a,b;
        read(a,b);
        ll r1=gcd(a,b);
        ll r2=a*b/r1;
        write(r1,r2);
    }
    return 0;
}

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

C++: #include <iostream>

using namespace std;

void keisann(int a, int b) {
	long long ac = a;
	long long bc = b;
	bool d = true;
	do {
		a = a%b;
		if (a == 0) {
			cout << b << " ";
			cout << ac*bc/ b << endl;
			d = false;
			continue;
		}
		b = b%a;
		if (b == 0) {
			cout << a << " ";
			cout << ac*bc / a << endl;
			d = false;
			continue;
		}
	} while (d == true);
}

int main()
{
	int a, b;
	while (cin >> a>>b,a!=EOF) {
		if (a > b) { keisann(a, b); }
		else if (a < b) {
			int c = a;
			a = b;
			b = c;
			keisann(a, b);
		}
		else if (a == b) {
			cout << "1" << " " << a << endl;
		}
	}
	return 0;
}

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

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