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++: #include<iostream>
#include<string>
#include<iomanip>
using namespace std;
int main(){
	int a,b;
	while(cin>>a>>b){
		int x=a,y=b;
		while(true){
			if(x==y)
				break;
			if(x>y)
				x-=y;
			else if(y>x)
				y-=x;
		}
		cout<<x<<" ";
		int keep=x;
		x=a/keep;
		y=b/keep;
		cout<<x*y*keep<<endl;
	}
	return 0;
}

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

unsigned GCD(unsigned a, unsigned b)
{
	unsigned s=(a<b)?a:b, l=(a<b)?b:a;
	unsigned gcd=1;
	for(unsigned i=2; i<=s; ++i)
	{
		while(s%i==0 && l%i==0)
		{
			s/=i;
			l/=i;
			gcd*=i;
		}
	}
	return gcd;
}

unsigned LCM(unsigned a, unsigned b)
{
	unsigned large = (a<b)?b:a;
	unsigned x = large;
	for(unsigned i=1; x<2000000000; ++i)
	{
		if(x%a==0 && x%b==0)
		{
			return x;
		}
		x+=large;
	}
}

int main()
{
	double a,b;
	while(cin>>a>>b)
	{
		cout << GCD(a,b) << ' ' << LCM(a,b) << '\n';
	}
}

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

//max 
long int gcd(long int a, long int b){
    if((a==0 || b==0)) return 0;
    while(a!=b){
        if(a>b) a=a-b;
        else b=b-a;
    }
    return a;
}

//min
long int lcm(long int a, long int b){
    if((a==0||b==0)) return 0;
    return ((a / gcd(a, b)) * b);
}
int main(void){
    long int a, b;
    while(cin>>a>>b){
        cout << gcd(a,b) << ' ' << lcm(a,b) << endl;
    }
    return 0;
}

C++: #include"iostream"
using namespace std;

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

C++: #include<iostream>
#include<algorithm>
#include<cstdio>
using namespace std;
int main(){
	long long a,b,s,m,ta,tb,tmp;
	while(cin>>a>>b){
	ta=a,tb=b;
	s=0,m=0;
	if(a<b)swap(a,b);
	if(a==0||b==0){
	
	}
	else 
	while(true){
		tmp=a;
		a=b;
		b=tmp%a;
		if(a%b==0){
			m=b;
			break;
		}
		if(a<b){
		//cout<<a<<" "<<b<<endl;
		m=1;
		break;
		}
	}
		
		s=(ta*tb)/m;
		cout<<m<<" "<<s<<endl;
	}
}

C++: #include<iostream>
#include<stdio.h>
using namespace std;
int gcd(int a,int b){
	int n;
	n = a%b;
	if (n == 0)return b;
	else return gcd(b, n);
}
int main() {
	int a, b, c, n,s;
	while (cin >> a >> b) {
		if (a > b)n = gcd(a, b);
		else n = gcd(b, a);
		s = a / n*b;
		cout << n << " " << s << endl;
	}
	return 0;
}

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

int lcm(int n, int m) {
    if (n < m) swap(n, m);
    if (m == 0)
        return n;
    else
        return lcm(m, n % m);
}

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

C++: #include<iostream>

using namespace std;

int main(){
	int a,b,ta,tb,tc;
	while(cin >> a>>b){
		ta=a;
		tb=b;
		while(1){
			if(ta<tb){
				tc=ta;
				ta=tb;
				tb=tc;
			}
			tc=ta%tb;
			if(tc==0)break;
			ta=tb;
			tb=tc;
		}
		cout << tb<< " "<< a*b/tb <<endl;
	}
	return 0;
}

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

inline u_long lcm(const u_long a, const u_long b) {
    return a * b / std::__gcd(a, b);
}

int main(void) {
    u_long a, b;

    while (std::cin >> a >> b) {
        std::cout << std::__gcd(a, b) << " " << lcm(a,b) << std::endl;
    }

    return 0;
}

C++: //#define _GRIBCXX_DEBUG
#include <algorithm>
#include <cctype>
#include <climits>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <deque>
#include <functional>
#include <iostream>
#include <iomanip>
#include <list>
#include <map>
#include <memory>
#include <numeric>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <utility>
#include <vector>
using namespace std;


// ?????¬???????????¬??????
#pragma region MACRO
#define P(x) cout << (x) << endl
#define p(x) cout << (x)
#define PED cout << "\n"
#define rep(i,n) for(int i=0; i<(int)n; ++i)
#define REP(i,x,n) for(int i=x; i<(int)n; ++i)
#define repi(i,n) for(int i=0; i<=(int)n; ++i)
#define REPI(i,x,n) for(int i=x; i<=(int)n; ++i)
#define ILP while(true)
#define FOR(i,c) for(__typeof((c).begin())!=(c).begin(); i!=(c).end(); ++i)
#define ALL(c) (c).begin(), (c).end()
#define mp make_pair
#pragma endregion

#pragma region TYPE_DEF
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<string, string> pss;
typedef pair<string, int> psi;
typedef pair<int, string> pis;
typedef vector<int> vi;
typedef vector<double> vd;
typedef vector<long> vl;
typedef vector<long long> vll;
typedef vector<string> vs;
#pragma endregion


// Effective std
#pragma region ESTD
template<typename C, typename T>
constexpr int count(C& c, T t) { return count(ALL(c), t); }
template<typename C, typename F>
constexpr int count_if(C& c, F f) { return count_if(ALL(c), f); }
template<typename C, typename T, typename U>
constexpr void replace(C& c, T t, U u) { replace(ALL(c), t, u); }
template<typename C, typename F, typename U>
constexpr void replace_if(C& c, F f, U u) { (ALL(c), f, u); }
template<typename C>
constexpr void sort(C& c) { sort(ALL(c)); }
template<typename C, typename Pred>
constexpr void sort(C& c, Pred p) { sort(ALL(c), p); }
template<typename C>
constexpr void reverse(C& c) { reverse(ALL(c)); }
#pragma endregion


// ?´???°
#pragma region PRIME
bool is_prime(unsigned n) {
  switch(n) {
    case 0:
    case 1: return false;
    case 2: return true;
  }
  if (n%2==0) return false;
  for (unsigned i=3; i*i<=n; i+=2)
    if (n%i==0) return false;
  return true;
}
#pragma endregion


// ??§??????/?°?????????????
#pragma region TRANSFORM
void mutal_tr(string &s) {
  for(int i=s.size(); i--;) {
    if(islower(s[i])) s[i] = toupper(s[i]);
    else if (isupper(s[i])) s[i] = tolower(s[i]);
  }
}
void to_upper(string &s) { for(int i=s.size(); i--;) s[i] = toupper(s[i]); }
void to_lower(string &s) { for(int i=s.size(); i--;) s[i] = tolower(s[i]); }
#pragma endregion


// ??????
#pragma region SET
template<class T>
set<T> intersection(const set<T>& sa, const set<T>& sb) {
  set<T> ret;
  for(T a : sa) if(sb.find(a) != sb.end()) ret.insert(a);
  return ret;
}
#pragma endregion

// Union Find
#pragma region UF
struct UnionFind {
  vector<int> data;
  UnionFind(int size) : data(size, -1) {}
  bool union_set(int x, int y) {
    x = root(x); y = root(y);
    if(x!=y) {
      if(data[y] < data[x]) swap(x, y);
      data[x] += data[y]; data[y] = x;
    }
    return x != y;
  }
  bool find_set(int x, int y) { return root(x) == root(y); }
  int root(int x) { return data[x] < 0 ? x : data[x] = root(data[x]); }
  int size(int x) { return -data[root(x)]; }
};
#pragma endregion


// ?????°
#pragma region CONST_VAL
#define PI (2*acos(0.0))
#define EPS (1e-9)
#define MOD (int)(1e9+7)
#pragma endregion

int gcd(int m, int n)
{
    if((0==m)||(0==n)) return 0;
    while(m!=n) {
        if(m>n) m = m - n;
        else n = n - m;
    }
    return m;
}

int lcm(int m, int n)
{
    if((0==m)||(0==n)) return 0;
    return((m/gcd(m,n))*n);
}

int main() {
    int a, b;
    while(cin>>a>>b) {
        printf("%d %d\n", gcd(a,b), lcm(a,b));

    }
    return 0;
}

C++: #include<iostream>
#include<string>
#include<algorithm>
using namespace std;
main(){
	int n1,n2,a1,a2;
	while(cin>>n1>>n2){
		int mx=max(n1,n2);
		for(int i=mx;i>0;--i){
			if(n1%i==0 && n2%i==0){
				a1=i;
				break;
			}
		}
		int flag=1;
		for(int i=1;i<=10000,flag;++i){
			for(int j=1;j<=10000;++j){
			//cout<<n1*i<<" "<<n2*j<<endl;
				if(n1*i==n2*j){
					a2=n1*i;
					flag=0;
					break;
				}
			}
		}
		cout<<a1<<" "<<a2<<endl;
	}
}