Go: package main

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

var sc = bufio.NewScanner(os.Stdin)

//Sliceconvtoi ...
func Sliceconvtoi() []int {
	strs := strings.Split(sc.Text(), " ")

	var ints []int
	var x int

	for _, s := range strs {
		x, _ = strconv.Atoi(s)
		ints = append(ints, x)
	}

	return ints
}

//Min .
func Min(a, b int) int {
	switch a < b {
	case true:
		return a
	default:
		return b
	}
}

//GCDandLCM .
func GCDandLCM(i []int) (int, int) {
	a := i[0]
	b := i[1]

	for {
		if a == b {
			break
		} else {
			a, b = Min(a, b), int(math.Abs(float64(a-b)))
		}
	}

	return a, i[0] * i[1] / a
}

func main() {
	for sc.Scan() {
		i := Sliceconvtoi()
		g, l := GCDandLCM(i)
		fmt.Println(g, l)
	}

}

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

int main(){
	long long unsigned int a, b, r, gcd, lcm, x, y;
	while(cin >> a >> b){
		r = 1;
		x = a;
		y = b;
		while(r != 0){
			r = x % y;
			x = y;
			y = r;
		}
	
		gcd = x;
		lcm = a * b / gcd;	
	
		cout << gcd << " " << lcm << endl;
	}
	return 0;
}

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

unsigned long gcd(unsigned long a, unsigned long b){
	unsigned long q;
	while(q = a % b){
		a = b;
		b = q;
	}
	return b;
}

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

int main(){
	unsigned long a, b;
	while(scanf("%ld %ld", &a, &b)){
		printf("%ld %ld", gcd(a, b), lcm(a, b));
	}

	return 0;
}

C++: #include<iostream>
#include<cmath>
using namespace std;
int f(int a,int b)
{
	if(a<b)
	swap(a,b);
	if(a==b)
	return a;
	int m;
	while(b)
	{
		m=a%b;
		a=b;
		b=m;
	}
	return a;
}
int main()
{
	int a,b;
	while(cin>>a>>b)
	{
		cout<<f(a,b)<<" "<<a/f(a,b)*b<<endl;
	}
}

C++: #include<iostream>

using namespace std;

int gcd(int m,int n){
   if(m<n) swap(m,n);
   while(true){
      if(n==0) return m; 
      int tmp=n;
      n=m%n;
      m=tmp;
  }
}

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

int main(){

   int a,b;

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

   return 0;

}

C++: #include <stdio.h>


int main(){

	unsigned long a=0, b=0,i=0,m=0,n=0,B=0;

	while(scanf("%d%d", &a, &b)!=EOF){

		if (a < b){
			i = a;
			a = b;
			b = i;
		}
		B = b;

		while (1){

			if (b == 0){
				printf("0 ");
				break;
			}

			n = a%b;
			if (n == 0){
				printf("%d ", b);
				break;
			}
			m = n;
			n = b%m;
			b = m;
		}
		if (b == 0){
			printf("%d\n", a);
		}
		else{

			m = a / b;/*/公倍数*/
			m = m*B;
			printf("%d\n", m);
		}
	}

	return 0;
}

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

C++: #include<iostream>
#include<string>
#include<algorithm>
#include<vector>
#include<queue>
#include<map>
#include<math.h>
#include<iomanip>
#include<set>
#include<numeric>
#include<cstring>
#include<cstdio>
#include<functional>
#include<bitset>
#include<limits.h>
#include<cassert>
#include<iterator>
#include<complex>
#include<stack>
#include<sstream>
#include<iterator>
using namespace std;
typedef  long long int lint;
typedef pair<int, int> IP;
typedef pair<lint, lint> LLP;
typedef pair<char, char>CP;
#define rep(i, n) for (int i = 0; i < n; i++)
#define repr(i, n) for (int i = n; i >= 0; i--)
#define sort(v) sort((v).begin(), (v).end())
#define reverse(v) reverse((v).begin(), (v).end())
#define upper(v,hoge) upper_bound(v.begin(),v.end(),hoge)
#define lower(v,hoge) lower_bound(v.begin(),v.end(),hoge)
#define llower(v,hoge) *lower_bound(v.begin(), v.end(), hoge)
#define lupper(v,hoge) *upper_bound(v.begin(), v.end(), hoge)

lint gcd(lint a, lint b) {
	//aとbの最大公約数を返す
	if (a < b)swap(a, b);
	if (a % b == 0)return b;
	return gcd(a % b, b);
}

lint lcm(lint a, lint b) {
	//aとbの最小公倍数を返す
	return a / gcd(a, b) * b;
}

int main() {
	lint A, B;
	while (cin >> A >> B) {
		cout << gcd(A, B) << ' ' << lcm(A, B) << endl;
	}

}

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

using namespace std;

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

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

C++: #include <iostream>
using namespace std;
int main(){
    long int a,b,lcm=0,count=0;
    while(cin>>a>>b){
        count++;
        if(count>50)break;
    for(int k=a;k>=1;k--){
        if(a%k==0&&b%k==0) {
            lcm=k;
            break;
        }
    }
    cout<<lcm<<" "<<a*b/lcm<<endl;
}
}

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

int main() {
  int a, b, c, d, tmp;
  int gcd, lcm;
  while(cin >> a >> b) {
    c = a;
    d = b;
    while(true) {
      if(c == d) break;

      if(c > d) {
        tmp = c;
        c = d;
        d = tmp;
      }

      d -= c;
    }
    gcd = c;
    lcm = (a/gcd) * b;
    cout << gcd << " " << lcm << endl;
  }

  return 0;
}

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

C++: // #define _CRT_SECURE_NO_WARNINGS
// #define _USE_MATH_DEFINES
#include <iostream>
#include <cstdio>
#include <algorithm>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <stack>
#include <cmath>
#include <cstdlib>
#include <functional>
#include <locale>
#include <cctype>
#include <sstream>
using namespace std;

typedef long long LL;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef map<int, int> MAPII;
typedef multimap<int, char, greater<int> > MuMAPIC;
typedef vector<pair<int, int> > VPII;
typedef multimap<int, string, greater<int> > MuMIS;

#define MP make_pair
#define FAST_IO  cin.tie(0); ios::sync_with_stdio(false);
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
//for gcc (???test)
// #define FOREACH_IT(it,c) for(typeof(c)::iterator it=(c).begin(); it!=(c).end(); ++it)
//for Visual Studio
#define foreach_it(type,it,c) for(type::iterator it=c.begin(),c_end=c.end();it!=c_end;++it)
// for Debug.
#define DUMP_VVI(b) FOR(i,0,b.size()){FOR(j,0,b[i].size())printf("%d ",b[i][j]);puts("");}
#define D_OUT(str,value) if(dbgF){cout<<str<<" : "<<value<<endl;}
// ??\??????push_back(d)???array[d]???????????????1?????§?????????
// int INPUT_INT() {int d;cin>>d;return d;}
template<class T>T IN(){T d;cin>>d;return d;}
// ?????§??¬?´???°???Greatest Common Divisor???
LL gcd(LL a, LL b){ return (b > 0) ? gcd(b, a%b) : a; }
// ????°???¬?????°???Least Common Multiple???
LL lcm(LL a, LL b){ return a / gcd(a, b) * b; }

// ------------------- include, typedef, define END. -------------------

int main(){
	FAST_IO;
	// for D_OUT(str, value)  ... cout<< str <<" : "<< value <<endl;
	bool dbgF = true;

	//??????????????????????????????.
	LL a,b;
	while(cin >> a >> b)
		cout << gcd(a,b) << " " << lcm(a,b) << endl;	

	return 0;
}

C++: #include <cstdio>

using namespace std;

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

int main() {
	while(scanf("%d%d", &a, &b) != EOF) {
		int gcd = GCD(a, b);
		printf("%d %d\n", gcd, a / gcd * b);
	}
	return 0;
}

C++: #include <stdio.h>

int main(){

	int a=0, b=0,i=0,m=0,n=0,B=0,A=0;

	scanf("%d%d", &a, &b);
	B = b;
	A = a;
	if (a < b){
		i = a;
		a = b;
		b = i;
	}

	while(1){

		n = a%b;
		if (n == 0){
			printf("%d ",b);
			break;
		}
		m = n;
		n = b%m;
		b = m;
	}
	m = A*B;
	m /= b;

	printf("%d\n", m);

	return 0;
}