Go: package main

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

var sc = bufio.NewScanner(os.Stdin)
var out = bufio.NewWriter(os.Stdout)

func main() {
	sc.Split(bufio.ScanLines)
	defer out.Flush()

	for sc.Scan() {
		a, b := nextInts()
		x, y := gcd(a, b), lcm(a, b)
		fmt.Fprintf(out, "%d %d\n", x, y)
	}

}

func nextInts() (a, b int) {
	s := strings.Split(sc.Text(), " ")
	ra, _ := strconv.Atoi(s[0])
	rb, _ := strconv.Atoi(s[1])
	a = ra
	b = rb
	return
}

func gcd(x, y int) int {
	if x < y {
		gcd(y, x)
	}
	for 0 < y {
		r := x % y
		x, y = y, r
	}
	return x
}

func lcm(x, y int) int {
	return (x * y) / gcd(x, y)
}

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

int gcd(unsigned int a , unsigned int b){
	if (a<b) {
		a^=b;
		b^=a;
		a^=b;
	}
	return a%b ? gcd(a , a%b) : b;
}

int lcm(unsigned int a , unsigned int b){
	int c;
	c=a/gcd(a,b);
	return c*b;
}

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

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

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 m, n;
	while(cin >> m >> n){
		cout << gcd(m,n) << " " << lcm(m,n) << endl;
	}
}

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

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

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

C++: #include <iostream>
int Gcd(int a, int b) // Greatest Common Divisor
{
    if (!a || !b) {
        return 0;
    }
    while (a != b) {
        if (a < b) 
            std::swap(a, b);
        a -= b;
    }
    return a;
}
int Lcm(int a, int b, int gcd) // Least Common Multiple
{
    if (!a || !b) {
        return 0;
    }
    return a * (b / gcd); // 桁あふれ防止のために計算順序考慮
}
int main()
{
    int a, b, gcd;
    while (std::cin >> a >> b) {
        gcd = Gcd(a, b);
        std::cout << gcd << " " << Lcm(a, b, gcd) << "\n";
    }
}

C++: #include<iostream>

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

int main(){
  int a, b, k;

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

C++: #include <iostream>
#include <vector>
#include <cmath>
#include <string>
#include <algorithm>
#include <iomanip>
#include <map>
#include <bitset>
#include <cstdio>
#include <set>
#include <stack>
#include <queue>
#include <cassert>
#include <numeric>
#define rep(i,n) Rep(i,0,n)
#define Rep(i,k,n) for(int i=k ; i<n ; i++)
#define rep1(i,n) for(int i=1 ; i<=n ; i++)
#define Rep1(i,k,n) for(int i=k ; i<=n ; i++)
#define rrep(i,n) for(int i=n ; i>=0 ; i--)
#define vi vector<int>
#define vii vector<vector<int>>
#define mii map<int,int>
#define Sort(v) sort(v.begin(),v.end())
#define Reverse(v) reverse(v.begin(),v.end())
#define ALL(a)  (a).begin(),(a).end()
#define pb push_back
#define mp make_pair
//#define int ll
typedef long long ll;

const int md = 1000000007;
const int INF = 1<<30;
using namespace std;

int gcd(int x, int y){
    return y ? gcd(y,x%y) : x;
}

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

    }
}

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

int main(){
	int a,b,gcd=1,lcm=1;
	while(cin >> a >> b){
		int c=a,d=b;
		for(int i = 2; i < c || i < d;){
			if(c%i==0&&d%i==0){
				c/=i;
				d/=i;
				lcm=gcd*=i;
			}else i++;
		}
		lcm*=c*d;
		cout << gcd << " " << lcm << endl;
	}
	return 0;
}

C++: #include<cstdio>

int main(){
	long long a,b,g,l,t;
	while(scanf("%lld %lld", &a, &b) + 1){
		if(a > b){
			t = a;
			a = b;
			b = t;
		}

		if(b % a){
			t = a / 2;
			for(int i = 2; i <= t; i++){
				if(!(a % i)){
					g = a / i;
					if(!(b % g)){
						printf("%lld %lld\n", g, a * b / g);
						i += t;
					}
				}
			}
		}else{
			printf("%lld %lld\n", a, b);
		}
	}
	return 0;
}

C++: #include<iostream>
using namespace std;
int main()
{
	int a,b,c,rest;
	while(1){
		cin >>a>>b;
		int a2=a,b2=b;
		if(a>b){c=a;a=b;b=c;}
		while((rest=b%a)!=0){
			b=a;
			a=rest;
		}
		cout <<a <<" "<<a2/a*b2 << endl;
	}
	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
// #define int long long   // <-----!!!!!!!!!!!!!!!!!!!

#define rep(i,n) for (int i=0;i<(n);i++)
#define rep2(i,a,b) for (int i=(a);i<(b);i++)
#define rrep(i,n) for (int i=(n)-1;i>=0;i--)
#define rrep2(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define all(a) (a).begin(),(a).end()

typedef long long ll;
typedef pair<int, int> Pii;
typedef tuple<int, int, int> TUPLE;
typedef vector<int> V;
typedef vector<V> VV;
typedef vector<VV> VVV;
const int inf = 1e9;

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

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

signed main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(0);

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

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

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

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

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

C++: #include<bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(n);i++)
#define loop(i,x,n) for(int i=(x);i<(n);i++)
#define all(x) (x).begin(),(x).end()
#define pb push_back
#define mp make_pair
#define fir first
#define sec second
#define ub upper_bound
#define lb lower_bound
#define int long long
using namespace std;
const int MOD=1000000007;
const int INF=1000000009;

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

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


signed main(){
  int a,b;
  while(cin>>a>>b){
    cout<<gcd(a,b)<<' '<<lcm(a,b)<<endl;
  }
  return 0;
}

C++: #include<stdio.h>
int main(){
	long long int a,b,x,y;
	scanf("%d%d",&a,&b);
	x=a;
	y=b;
	while(a!=b){
		if(a>b)a-=b;
		else b-=a;
	}
	printf("%d%d",a,x/a*y);
	return 0;
}

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

C++: #include <iostream>
#include <cstdio>
#include <cmath>
#include <algorithm>
#include <cstring>
#include <string>

#define sf scanf
#define pf printf

using namespace std;

int GCD(int a,int b)
{
    if(b == 0) return a;
    return GCD(b,a%b);
}
int main()
{
    int a,b;
    while(~sf("%d%d",&a,&b))
    {
        int gcd = GCD(a,b);
        int lcm = a / gcd * b;
        pf("%d %d\n",gcd,lcm);
    }
    return 0;
}

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

int gcd(int a,int b)
{
    int l,s,r;
    if (a<b)
    {
	l=b;
	s=a;
    } else {
	l=a;
	s=b;
    }
    while(true)
    {
	r=l%s;
	if (r == 0) break;
	l=s;
	s=r;
    }
    return s;
}

int main()
{
    int a,b;
    vector<int> r1,r2;
    while (scanf("%d %d",&a,&b) != EOF)
    {
	r1.push_back(gcd(a,b));
	r2.push_back(a/r1[r1.size()-1]*b);
    }
    for (int i=0; i<r1.size(); i++)
    {
	cout << r1[i] << " " << r2[i] << endl;
    }
}