Go: package main

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

func gcd(num1, num2 int) int {
	if num2 == 0 {
		return num1
	}
	num3 := num1 % num2
	return gcd(num2, num3)
}

func lcm(num1, num2 int) int {
	if num1%num2 != 0 {
		num3 := gcd(num1, num2)
		for i := 1; ; i++ {
			check := num3 * i
			if check%num1 == 0 && check%num2 == 0 {
				return check
			}
		}
	} else {
		return num1
	}
}

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	for scanner.Scan() {
		row := strings.Fields(scanner.Text())
		nums := []int{}

		for _, v := range row {
			num, _ := strconv.Atoi(v)
			nums = append(nums, num)
		}
		fmt.Println(gcd(nums[0], nums[1]), lcm(nums[0], nums[1]))
	}
}

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

double gcd(double m,double n);
double lcm(double m,double n);

int main(){
	int i;
	double a,b;
	double z[10] ={0} ;
	double y[10] = {0} ;


	for(i=0;i<4;i+=2){
		while(1){
			cin >> a >> b ;
			z[i] = a ;
			z[i+1] = b ;

			if((z[i] <= 200000000) && (z[i] > 0 )){
				if((z[i+1] <= 2000000000) && (z[i+1] > 0)) break;
			}
		}


	}

	y[0] = gcd(z[0],z[1]) ;
	y[1] = lcm(z[0],z[1]) ;
	y[2] = gcd(z[2],z[3]) ;
	y[3] = lcm(z[2],z[3]) ;

	cout << y[0] << " "<< y[1] << "\n" ;
	cout << y[2] << " " << y[3] << endl ;
	return 0;
}

	double gcd( double m, double n )
{
	// 引数に０がある場合は０を返す
	if ( ( 0 == m ) || ( 0 == n ) )
		return 0;
	
	// ユークリッドの方法
	while( m != n )
	{
		if ( m > n ) m = m - n;
		else         n = n - m;
	}
	return m;
}

double lcm( double m, double n )
{
	// 引数に０がある場合は０を返す
	if ( ( 0 == m ) || ( 0 == n ) )
		return 0;
	
	return ((m / gcd(m, n)) * n); // lcm = m * n / gcd(m,n)
}

C++: #include<iostream>

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

int main(){
  int a, b;

  while(std::cin >> a >> b){
    std::cout << (a*b)/gcd(a,b) << " " << gcd(a,b) << std::endl;
  }
}

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

    }
    return 0;
}

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

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

long long gcd(long long a, long long b);

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

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

C++: #include <stdio.h>

int main(void){
    long a,b,i=2;
    while(scanf("%ld %ld",&a,&b)!=EOF){
        i=a;
        while(1){
            if(a%i==0&&b%i==0) break;
            i--;
        }
        printf("%ld %ld\n",i,a*b/i);
    }
    return 0;
}

C++: #include <iostream>
 
using namespace std;
 
int main() {
 
    long long int ain[50],bin[50];
    long long int a,b,c,d,e,gcm,lcd;
    int loop=50;
    
    for(int i = 0;i<50;i++) {
    	ain[i]=0;
    	bin[i]=0;
        cin >> ain[i] >> bin[i];
        /*if (ain[i]==null) {
        	loop = i;
        	break;
        }*/
    }
    for (int i = 0;i <= loop;i++) {
    a = ain[i];
    b = bin[i];
    if (a==0&&b==0) break;
    if (a < b) {
        c  = a;
        a  = b;
        b = c;
        c=0;
    }
 
    c=a;
    d=b;
 
    for(;;) {
        if(d==0) {
            gcm = c;
            lcd = (a * b) / gcm;
            break;
        }
        e = c % d;
        c = d;
        d = e;
    }
 
    cout << gcm << " " << lcd << endl;
    }
 
    return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;
int main()
{
    long long int n1,n2,gcd,lcm,c;
    while(scanf("%lld%lld",&n1,&n2)!=EOF)
    {

   c=__gcd(n1,n2);
    lcm=(n1*n2)/c;
        printf("%lld %lld\n",c,lcm);
        }
    return 0;
}