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>
#include <stdlib.h>
using namespace std;

int main(){
    int a,b;
    
    while(cin >> a >> b){
        
        int g,l;
        int aa,bb;
        g = l = 1;
        
        /* ?????§??¬?´???° */
        aa = a;
        bb = b;
        while(true){
            int tmp = 0;
            
            if(aa % 3 == 0 && bb % 3 == 0){
                aa /= 3;
                bb /= 3;
                tmp = 3;
            }
            else if(aa % 2 == 0 && bb % 2 == 0){
                aa /= 2;
                bb /= 2;
                tmp = 2;
            }
            
            if(g == 0){
                g = tmp;
            }
            else{
                g *= tmp;
            }
            
            if(aa <= 3 || bb <= 3){
                break;
            }
            
            if((aa % 2 != 0 && bb % 2 != 0) ||
               (aa % 3 != 0 && bb % 3 != 0)){
                break;
            }
        }
        
        /* ????°???¬?????° */
        aa = a;
        bb = b;
        while(true){
            int tmp = 0;
            
            if(aa % 3 == 0 && bb % 3 == 0){
                aa /= 3;
                bb /= 3;
                tmp = 3;
            }
            else if(aa % 2 == 0 && bb % 2 == 0){
                aa /= 2;
                bb /= 2;
                tmp = 2;
            }
            
            if(g == 0){
                l = tmp;
            }
            else{
                l *= tmp;
            }
            
            if(aa <= 3 || bb <= 3){
                l *= aa;
                l *= bb;
                break;
            }
            
            if((aa % 2 != 0 && bb % 2 != 0) ||
               (aa % 3 != 0 && bb % 3 != 0)){
                l *= a;
                l *= b;
                break;
            }
        }
        
    }
    
    return 0;
}

C++: #include <iostream>

using namespace std;

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;
}


int main()
{
  int a, b;

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

  return 0;
}

C++: #include<iostream>
int gcd(int x,int y){
	if(y==0)return x;
	else return gcd(y,x%y);
}
int lcm(int x,int y){
	return ((x/gcd(x,y))*y); 
}
int main(){
	int a,b;
	while(1){
		std::cin>>a>>b;
		if(std::cin.eof())break;
		std::cout<<gcd(a,b)<<" "<<lcm(a,b)<<std::endl;
	}
	return 0;
}

C++: #include <iostream>
using namespace std;
int main(){
    int a,b,lcm=0,r,x,y;
    while(cin>>a>>b){
        x=a;
        y=b;
        while(1){
        r=a%b;
        a=b;
        b=r;
        if(r==0)break;
        }
        lcm=a;
    cout<<lcm<<" "<<x*y/lcm<<endl;
}
}

C++: #include<iostream>
using namespace std;
int main(){
int a,aaa,bbb, b, aa[100], bb[100], r,kazu,m;
kazu = 0;
while (cin >> aaa >> bbb) {
	kazu++;
	m = aaa * bbb;
	a = aaa;
	b = bbb;
	if (a <= b) {
		r = a;
		a = b;
		b = r;
	}
	while (b != 0) {
		r = a % b;
		a = b;
		b = r;
	}
	aa[kazu] = a;
	if (m > 0) {
		bb[kazu] = m / aa[kazu];
	}
	else {
		m = aaa / aa[kazu];
		bb[kazu] = m * bbb;
	}
}
for (int i = 1; i <= kazu; i++) {
	cout << aa[i] << " " << bb[i] << endl;
}
}

C++: #include <iostream>
using namespace std;
int gcd(int,int); //最大公約数
int lcm(int,int); //最小公倍数
int main(){
    int a,b;
    while (cin >>a >>b){
        cout << gcd(a,b) << " " << lcm(a,b) << endl;
    }
}

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

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

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

typedef long long ll;

void lc(ll a,ll b)
{
	ll m=a,n=b,c;  
    while(b!=0)  
    { 
    	c=a%b; 
		a=b; 
		b=c;
	} 
	printf("%lld %lld\n",a,m/a*n);
}
int main (void)
{
	ll a,b;
	while(scanf("%lld%ulld",&a,&b)!=EOF)
	    lc(a,b);
	return 0;
}

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

int saidai(long long int a,long long int b){
	while(b){
		int m=a%b;
		a=b;
		b=m;
	}
	
	return a;
}


int	saisyou( long long int a,long long int b ){
	return (a*b)/saidai(a,b);
}

int main(){
	long long int a,b;
	cin>>a;
	cin>>b;
	
	cout<<saidai(a,b)<<" "<<saisyou(a,b);;
	return 0;

}

C++: #include<iostream>


long long gcd (long long a, b) {
  if(a < b) {
    int foo = a;
    a = b;
    b = foo;
  }

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

int main() {
  long long a ,b;

  while (scanf("%ld", &a) != EOF) {
    scanf("%ld", &b);
    long long g = gcd(a, b);
    printf("%ld %.3lf\n", g, a * b / g);

  }

  return 0;
}

C++: #include<iostream>
#include<cstdio>
#include<algorithm>
#include<vector>
typedef long long ll;

using namespace std;

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

int main(){
    ll a,b;
    while(cin>>a>>b){
        ll ans1=gcd(a,b);
        ll ans2=a/ans1*b;
        cout<<ans1<<" "<<ans2<<endl;
    }
    return 0;
}

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

int main(){
	long a, b;
	while (cin >> a >> b){
		long c = a;
		long d = b;
		while (1){
			if (c < d) swap(c, d);
			// c >= d
			if (c % d == 0){
				cout << d << " " << (a * b) / d << endl;
				break;
			}
			else{
				long tmp = c;
				c = d;
				d = tmp % d;
			}
		}
	}
	return 0;
}

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

int u(int a, int b);
int l(int a, int b);

int main(){
  int a, b;
  int gcd, lcm;
  
  while(scanf("%d", &a)!=EOF){
    scanf("%d", &b);
    gcd = u(a, b);
   // lcm = l(a, b);
//printf("%d %d\n",gcd, lcm);
    //std::cout << gcd << " " << lcm << std::endl;
  }
  
  return 0;
}

int u(int a, int b){
  while(a==1 || b==1){
    if(a>=b){
      a = a % b;
    }else{
      b = b % a;
    }
  }
  
  if(a==1){return b;}
  else{return a;}
}

int l(int a, int b){
  int i = 2;
  
  while(1){
    if(a%i==0){
      if(b%i==0){return i;}
      else{i++;}
    }else{
      i++;
    }
  }
}

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

C++: #include<stdio.h>
#include<iostream>
#include<string>
#include<cstdlib>

using namespace std;

int main()
{
	int  a, b, a1, b1, c, g;
	long l;
	cin >> a >> b;
	a1 = a;
	b1 = b;
	while (1)
	{
		if (a == 0 || b == 0)
		{
			break;
		}


		while (1)
		{
			c = abs(a - b);
			if (c == 0)
			{
				break;
			}

			if (a > b)
			{
				a = c;
				g = c;
			}
			else if (a < b)
			{
				b = c;
				g = c;
			}
		}
		l = (a1 / g)*b1;
		cout << g << " " << l<<endl;
		cin >> a >> b;
		a1 = a; b1 = b;
	}
}

C++: #include <iostream>

int main(){

	u_int a, b;

	while(std::cin >> a >> b){

		long int minmul; //least common multiple
		u_int maxdivi = 1; //greatest common divisor
		u_int small;

		if(a > b)
			small = b;
		else
			small = a;

		for(int i = 2; i <= small; ++i){
			if(a % i == 0  &&  b % i == 0){
				maxdivi = maxdivi * i;
				i = 2;
			}
		}
		minmul = a * b / maxdivi;

	std::cout << maxdivi << " " << minmul << std::endl;

	}

	return 0;
}