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 <bits/stdc++.h>

using namespace std;
using ll = long long;
using pii = pair<int, int>;

ll gcd(ll a, ll b) {
  return b == 0 ? a : gcd(b, a % b);
}
ll lcm(ll a, ll b) {
  return a / gcd(a, b) * b;
}

int main() {
  cin.tie(0);
  ios_base::sync_with_stdio(false);
  cout << fixed << setprecision(10);
  
  int a, b;
  while (cin >> a >> b) {
    cout << gcd(a, b) << " " << lcm(a, b) << endl;
  }

  return 0;
}

C++: #include<iostream>
#include<vector>
#include<algorithm>
#include<set>
#include<queue>
#include<string>
#include<cstdio>
#include<stack>
#include<cmath>
#include<bitset>
#include<memory>
#include<utility>
using namespace std;
#define FOR(i,m,n) for(i=m;i<n;i++)
#define CLR(a,b) memset(a,b,sizeof(a))
#define ROF(i,m,n) for(i=m;i>=n;i--)
#define BUG cout<<"debug"<<endl;
#define RT return
#define BK break
#define HEAP priority_queue
#define SP " "
#define lowf(a,b,c) lower_bound(a,b,c)
#define upf(a,b,c) upper_bound(a,b,c)
typedef long long LL;
typedef vector<int> VI;
const int INF = 2147483647;
const int NEN = -INF - 1;
const LL LINF = 9223372036854775807;
LL gcd(LL a, LL b)
{
	return b ? gcd(b, a%b):a;
}
int main()
{
	LL a, b,c;
	while (cin >> a >> b)
	{
		c = gcd(a, b);
		cout << c << " " << a*b / c << endl;
	}
    return 0;
}

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

int main(){

  int a, b;
  int lcm=1, gcd=1;

  while( cin >> a >> b ) {
    for(int i=a; i>1; i--) {
      if(a%i == 0 && b%i == 0) {
        lcm = i;
        a = a/i;
        b = b/i;
        i = a;
      }
    }
    gcd = a*b*lcm;
    cout << lcm << " " << gcd <<"\n";
    lcm = 1;
    gcd = 1;
  }

  return 0;
}

C++: #include<iostream>
#include<vector>
using namespace std;
int gcd(int a,int b){
  if(b==0)return a;
  return gcd(b,a%b);
}
int main(){
  while(true){
    int a,b;
    cin >>a>>b;
    if(cin.eof())return 0;
    int g = gcd(a,b);
    cout << g << ' '<<a/g*b;
  }
}

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

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

int main()
{   int n;
    cin>>n;
    while(n--)
    {
           int min,max,a,b;
    cin>>a>>b;
    max = gcd(a,b);
    min = (a/max)*(b/max)*max;
    cout << max << " " << min<<endl;
    }
    return 0;
}

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

C++: #include <iostream>
#include <stdio.h>
#include <vector>
#include <algorithm>
#include <math.h>
#include <utility>

using namespace std;

#define FOR(i,k,n) for(int i = (k); i < (n); i++)
#define REP(i,n) FOR(i,0,n)

int a, b, gcd, lcm;

void GCD(int x, int y)
{
	if (x < y) swap(x, y);
	x = x % y;
	if (x != 0) GCD(x,y);
	else gcd = y;
}

int main()
{

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

C++: #include <stdio.h>

long GetGCD(long x, long y);

int main(void){
    long  n,m,gcd,lcm;
    
    while (scanf("%d %d", &n, &m)!=EOF){
        gcd = GetGCD(n,m);
        lcm = n * m / gcd;
        printf("%d %d\n", gcd, lcm);
    }
    return 0;
}

long GetGCD(long x, long y){
    return y%x ? GetGCD(y%x, x) : x;
}

C++: #include <math.h>
#include <algorithm>
#include <iomanip>
using namespace std;

int main(){
	long long int x, y;
	while (cin >> x >> y) {
		long long int a, b, c;
		a = max(x, y);
		b = min(x, y);
		c = a % b;
		while (c) {
			a = b;
			b = c;
			c = a % b;
		}
		cout << b << ' ' << x * y / b << endl;
	}
	return 0;
}

C++: #include <cstdio>
#define L long long int

L lcm(L a,L b){
  if(a==b)
    return a;
  else if(a<b)
    return lcm(b,a);
  else
    return lcm(a-b,b);
}

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

int main(){
  L a,b;

  while(~scanf("%lld %lld",&a,&b))
    printf("%lld %lld\n",lcm(a,b),gcd(a,b));
}

C++: #include <iostream>
#include <cstdio>
#include <cmath>
#include <vector>
#include <queue>

#include <map>
#include <set>
#include <string>
#include <algorithm>
#include <functional>
using namespace std;
#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define RFOR(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define REP(i,n) for (int i=0;i<(n);i++)
#define RREP(i,n) for (int i=(n)-1;i>=0;i--)
#define INF 1<<30
#define ALEN(ARR) (sizeof(ARR) / sizeof(ARR[0]))
#define MP make_pair
#define mp make_pair
#define pb push_back
#define PB push_back
#define DEBUG(x) cout<<#x<<": "<<x<<endl
#define ll long long
#define ull unsigned long long
#define MOD 1000000007

ll gcd(ll a, ll b) {
    if(a < b) swap(a, b);
    while(b > 0) {
        int r = a % b;
        a = b;
        b = r;
    }
    return a;
}

ll lcm(ll a, ll b) {
    if(a == 0 || b == 0) {
        cout << "Error" << endl;
        return 0;
    }

    return (a * b / gcd(a, b));
}

int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout.precision(16);

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

  return 0;
}

C++: #include <iostream>
#include <iomanip>
#include <vector>
#include <string>
#include <stack>
#include <queue>
#include <deque>
#include <set>
#include <map>
#include <algorithm>
#include <sstream>
#include <cstdlib>
#include <cstring>
#include <functional>
#include <numeric>
#include <cmath>
#include <climits>
#include <limits>
#include <cfloat>
#include <fstream>
using namespace std;

int gcd (int a, int b)
{
	if (a > b){
		swap(a,b);
	} // end if
	while (b % a != 0){
		b = b % a;
		if (a > b){
			swap(a,b);
		} // end if
	} // end while

	return a;
}
long lcm (int a, int b)
{
	long res = a/gcd(a,b);
 	res *= b;
	return res;
}
int main()
{
//	cut here before submit 
//	freopen("testcase.gl", "r", stdin);
	string str = "";

	while (getline (cin, str )){
		int a, b;
		stringstream ss(str);
		ss >> a >> b;
		cout << gcd(a,b) << ' ' << lcm(a,b) << endl;
	} // end for

	return 0;
}

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

#define FOR(i,a,b) for(long long int i=(a);i<(b);i++)
#define REP(i,n) for(long long int i=0;i<(n);i++)
#define ALL(s) (s).begin(),(s).end()

#define PI 3.14159265358479

typedef long long int ll;
typedef vector<long long int> vi;

int main(){
	ll a, b, da, db, c, GCD, LCM = 0, k = 0;
	bool f;
	while (cin >> a >> b){
		da = a;
		db = b;
		if (a > b){
			k = a;
			a = b;
			b = k;
		}
		while (1){
			c = b%a;
			if (c == 0){
				GCD = a;
				break;
			}
			b = a;
			a = c;
		}
		LCM = da*db / GCD;
		cout << GCD <<" "<< LCM << "\n";
	}
}

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

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

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

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