Go: package main
import (
	"os"
	"fmt"
	"strconv"
	"bufio"
	"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 <bits/stdc++.h>
using namespace std;
typedef long long ll;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
long long gcd(long long a, long long b) {
  if (b == 0) return a;
  return gcd(b, a % b);
}

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

int main() {
  ll a, b;
  while (true) {
    cin >> a >> b;
    if (cin.eof()) break;
    cout << gcd(a, b) << " " << lcm(a, b) << endl;
  }
  return 0;
}

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

int main() {
	// your code goes here
	long long int a,b;
	long long int miner,maxer;
	while(cin >> a >> b){
		int a2=a,b2=b;
		while(max(a2,b2)%min(a2,b2)!=0){
			if(a2>b2)
			a2=a2-b2;
			else
			b2=b2-a2;
		}
		miner =min(a2,b2);
		cout << miner << endl;
		cout << a*b/miner << endl;
	}
	return 0;
}

C++: #include<iostream>
#include<string>
#include<cstdio>
#include<algorithm>
using namespace std;
int main(){
    long long i,a,b,c;
    while(cin>>a>>b){
        if(a==b){
            cout<<a<<" "<<a<<endl;
        }
        else{
        if(a<b){
            i=b-a;
        }
        else{
            i=a-b;
        }
    for( long long j=i;j>0;i--){
        if(a%i==0 && b%i==0){
            c=i;
            break;
        }
    }
    cout<<c<<" "<<a*b/c<<endl;
        }
    }
    return 0;
}

C++: #include <iostream>

using namespace std;

int main() {
    int a,b,big,small,r;

    while(1){
        cin >> a >> b;
        if(cin.eof()){
            break;
        }
        
        if(a > b){
            big = a;
            small = b;
        }
        else {
            big = b;
            small = a;
        }
        
        r = big % small;
        while(r != 0){
            big = small;
            small = r;
            r = big % small;
        }
        
    }
    
    cout << small << ' ' << (a / small) * (b / small) * small << endl; 

    return 0;
}

C++: #include <algorithm>
#include <iostream>
using namespace std;
int main() {
	long long a, b;
	while (cin >> a >> b) {
		cout << __gcd(a,b) << " " << a / __gcd(a,b) * b << "\n";
	}
}

C++: #include<iostream>
using namespace std;
int main(){
    int  i,a,b,c;
    while(cin>>a>>b){
        if(a==b){
            cout<<a<<" "<<a<<endl;
        }
        else{
        if(a<b){
            i=b-a;
        }
        else{
            i=a-b;
        }
    for( int j=i;j>0;i-=2){
        if(a%i==0 && b%i==0){
            c=i;
            break;
        }
    }
    cout<<c<<" "<<a*b/c<<endl;
        }
    }
    return 0;
}

C++: #include <iostream>

using namespace std;

int main()
{
	int a, b, c, r;
	int gcd, lcm;

	while (cin >> a >> b){
		if (b > a){
			c = a; 
			a = b; 
			b = c;
		}

		lcm = a * b;
		while (1){
			r = a % b;

			gcd = b;
			if (r == 0){
				break;
			}
			a = b;
			b = r;
		}

		lcm /= gcd;
		cout << gcd << " " << lcm << endl;
	}

	return 0;
}

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

int GCD(int value1,int value2){
    int large,small;
    
    if(value1>=value2){
        large=value1;
        small=value2;
    }else{
        large=value2;
        small=value1;
    }
    
    if((large%small)==0){
        return small;
    }else{
        return GCD(small,large%small);
    }
}

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

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++)
    {

C++: #include <iostream>

int  main() {

	//?????§??¬?´???° =????????????????????????????????????
	/*(1) a ??? b ??§???????????????????????? r ?????\????????????
	???(2) r ??? 0 ?????? b ????????§??¬?´???°??§?????????????????????????????????
	???(3) ????????§????????¨????????°a = b?????°b = r ??¨?????? (1) ???????????????????????????*/

	 //????°???¬?????° =???a*b???/???a??¨b????????§??¬?´???°?????§?±?????????????
	long long  a = 0, b = 0, ad = 0, bd = 0, swap, amari, koba = 0;
	std::cin >> a >> b;
	ad = a; bd = b;
	if (b >= a) { swap = a; a = b; b = swap; }
		
	a:
		amari = a%b;
		if (amari == 0) {
			std::cout << b << " ";
			std::cout << ad*bd / b << std::endl;
		}
		else {
			a = b;
			b = amari;
			goto a;
		}
}

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

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

int main() {
  int x,y;
  while(cin >> x >> y) {
    int a = gcm(x,y);
    cout << a << " " << x*y/a << endl;
  }
}

C++: #include <iostream>
#include <math.h>

using namespace std;

void solve(int a, int b) {
	int max_num = max(a,b);
	int p[max_num]; int count = 2;
	bool f;
	for (int i=2; i<max_num; i++) {
		if (i == 2) {
			p[0] = 2;
		} else if (i == 3) {
			p[1] = 3;
		} else {
			for (int j=0; j<sizeof(p); j++) {
				if (i%p[j]==0) {
					f = false;
				}
			}
			if (f) {
				p[count] = i;
				count++;
			}
		}
	}
	int gcj = 0;
	for (int i=0; i<sizeof(p); i++) {
		if (a%p[i]==0 && b%p[i]==0)
			gcj = max(gcj, p[i]);
	}
	int lcm = a*b/gcj;
	cout << gcj << " " << lcm << endl;
}

int main() {
	int a, b;
	while (cin >> a >> b) {
		solve(a,b);
	}
	return 0;
}

C++: #include <iostream>
#include <cstdio>
using namespace std;
typedef long long Int;
Int gcd(Int a, Int b)
{   
  return b != 0 ? gcd(b, a % b) : a; }

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

main() {
  Int a,b;
  while((cin>>a>>b)) {
    Int gc = gcd(a,b);
    cout << gc << " " << a*b/gc << endl;
  }
}

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

long long main() {
	int a,b,e,f;
	while(cin>>a>>b){
		int l;
		e=a;
		f=b;
		while(1){
		if(e>f){
			e=e%f;
		}
	    if(f>e){
	    	f=f%e;
	    }
	    if(f==e){
	    	l=e;
	    	cout<<l<<" "<<(a*b)/l<<endl;
	    	break;
	    }
		}
	}
	return 0;
}