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 <bits/stdc++.h>
using namespace std;

#define iota(i,n,b,s) for(int i=int(b);i!=int((b)+(s)*(n));i+=(s))
#define range(i,n,m) iota(i,(((n)>(m))?((n)-(m)+1):((m)-(n)+1)),(n),((n)>(m)?-1:1))
#define rep(i,n) iota(i,(n),0,1)

#define INF (1e9)
#define EPS (1e-9)
#define cons(a,b) (make_pair(a,b))
#define car(a) (a.first)
#define cdr(a) (a.second)
#define cadr(a) (car(cdr(a)))
#define cddr(a) (cdr(cdr(a)))
#define all(a) a.begin(), a.end()
#define trace(var) cerr<<">>> "<<#var<<" = "<<var<<endl;

typedef long long Integer;
typedef double Real;

template<class S, class T>
ostream& operator<<(ostream& os, pair<S,T> p) {
  os << '(' << car(p) << ", " << cdr(p) << ')';
  return os;
}

template<class T>
ostream& operator<<(ostream& os, vector<T> v) {
  os << v[0];
  for (int i=1, len=v.size(); i<len; ++i) os << ' ' << v[i];
  return os;
}

int dx[] = { -1, 0, 1, 0 };
int dy[] = {  0, -1, 0, 1 };

int main() {

  for (Integer a, b; cin >> a >> b, cin; ) {
    Integer x = max(a,b);
    Integer y = min(a,b);
    while (y > 1) {
      x %= y;
      Integer t = x;
      x = y;
      y = t;
    }
    cout << x << ' ' << (a / x * b) << endl;

  }

  return 0;
}

C++: #include<iostream>
#include<vector>
#include<algorithm>
#include<string>

#define add push_back
#define inf 2147000000

#define rep(i,n) for(int i=0;i<n;i++)
#define deb(a) cout<<a<<endl
#define out(a) cout<<a<<endl;

using namespace std;

int main(void){
	string str;
	cin>>str;
	for(int i=str.size()-1;i>=0;i--){
		cout<<str[i];
	}
	cout<<endl;
}

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

using namespace std;

int a, b;
int gcd, lcm;

void GCD(){

	int big, small;

	big = a;
	small = b;

	while (big) {
		if (small > big) swap(big, small);
		big = big % small;
	}
	gcd = small;

}

void LCM() {
	lcm = a / gcd * b;
}




int main(){
	while (cin >> a >> b) {

		GCD();
		LCM();
		cout << gcd << " " << lcm << endl;
	}
	return 0;
}

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

int main(){
   int a = -1;int b = 0;int i = 1;int g = 0;int seki = 1;
	   cin >> a >> b;
          seki = a*b;
	if(a == -1){
		break;
		}
	if(a < b){
		i=a;
		a=b;
		b=i;
		}
for(i = 1;i <= 50;i++){
   
if(b == 1){
  g = a;
  break;
  }
else {
 a = a%b;
 i=a;
 a=b;
 b=i;
 }
}
cout >> g >> " " >> seki/g >> endl;

    return 0;
}

C++: #include <iostream>

//?????§??¬?´???°????±???????????????°??????(m >= n)
int calcGcd(int m, int n);
//????°???¬?????°????±???????????????°??????
inline int calcLcm(int m, int n, int gcd);

int main(){
	int gcd, lcm, a, b;
	
	while(std::cin >> a >> b){
		if(a > b) gcd = calcGcd(a, b);
		else gcd = calcGcd(b, a);
		lcm = calcLcm(a, b, gcd);
		
		std::cout << gcd << " " << lcm << std::endl;
	}
	
	return 0;
}

int calcGcd(int m, int n){
	return n == 0 ? m : calcGcd(n, m%n);
}

inline int calcLcm(int m, int n, int gcd){
	return m / gcd * n;
}

C++: #include <cstdio>

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

int main() {
    while (1) {
        int a, b;
        int ret = scanf("%d%d", &a, &b);
        if (ret < 0) break;
        int g = gcd(a, b);
        printf("%d %d\n", g, a / g * b);
    }
    return 0;
}

C++: #include<iostream>

using namespace std;

long saidai(long a,long b){

	for(long i=a ;i>0 ;i-- ){
		
		if(a%i==0 && b%i==0){
			return i;
			break;
		}
	}
}

long saisho(long a,long b){
	long t;
	//t=a*b;
	for(long i=a ;i<=2000000000 ;i++){
		if(i%a==0 && i%b==0){
			return i;
			break;
		}
	}
	//return a*b;
}

int main(){
	long a,b;

	while(cin >> a >> b){

	cout << saidai(a,b) << " " << saisho(a,b) << endl;
	}
	return 0;
	
}

C++: #include<iostream>

using namespace std;

long yakusuu(long a,long b){
	int t;
	if(a>=b) t=a;
	if(a<b) t=b;
	
	for(long i=t ;i>=1 ;i--){

			if(a%i==0 && b%i==0){
				return i;
				break;
			}
	}
}

long baisuu(long a,long b){

	for(long i=1;i<=a*b ;i++){
		if(i%a==0 && i%b==0){
			return i;
			break;
		}
	}
}


int main(){


	long a,b;
	long R,L;

	cin >> a >> b;

	R=yakusuu(a,b);
	L=baisuu(a,b);

	cout << R << " " << L <<endl;

	return 0;

}

C++: #include <iostream>
#include <cstdio>
using namespace std;
int gcd(int a, int b){
    int p,q,r;if(a<b){
        p=b;b=a;a=p;
        }
        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>
using namespace std;

long long gcd(long long a,long long b)
    {long long t;if(a>b)t=a,a=b,b=t;while(a)t=a,a=b%a,b=t;return b;}
long long lcm(long long a,long long b){return a*b/gcd(a,b);}

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

C++: #include<iostream>
#include<stdio.h>
#include<math.h>
using namespace std;

int gcd(int u, int v) {
  int r;
  while (0 != v) {
    r = u % v; u = v; v = r; /* swap */
  }
  return u;
}

int main(){
	int a,b,x;
	while(scanf("%d",&a)!=EOF){
		cin>>b;
	cout<<gcd(a,b)<<" ";
	x=a*b;
	if(a<b){
		int tmp = a;
		a = b;
		b = tmp;
	}
	cout<<x/gcd(a,b)<<endl;
	}
    return 0;
}

C++: #include <cassert>
#include <iostream>
#include <vector>

using namespace std;
typedef long long ll;

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

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

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

C++: #include <iostream>
using namespace std;
int gcd(int x,int y){
	if(x==0)return y;
	return gcd(y%x,x);
}
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<<endl;
	}
}

C++: #include <iostream> 
#include<string.h>
#include<stdio.h>
using namespace std;
long long cc( long  long  q, long long  p)
{

	if(q%p==0)
	{
		return p;
	}
	else
	return cc(p,q%p);
}
main()
{
	long long x,y,a[1000],b[1000];
	int i=0;
	while(scanf("%lld%lld",&x,&y)!=EOF)
	{
	  
		 a[i]=cc(x,y);
		 b[i]=x/a[i]*y;
	     i++;	
	     
	}
	for(int j=0;j<i;j++)
	{
		printf("%lld %lld\n",a[i],b[i]);
	}
}

C++: #include <stdio.h>
using namespace std;

int gcd(int num1,int num2) {
	if (num2 == 0) {
		return num1;
	}return gcd(num2, num1 % num2);
}

int lcm(int num1,int num2) {
	return num1 / gcd(num1, num2) * num2;
}

int main() {
	long a, b;
	while (scanf_s("%d %d",&a,&b)!=EOF) {
		printf("%d %d\n", gcd(a, b),lcm(a,b));
	}
}

C++: # include <iostream>

unsigned long a, b;

unsigned long gcd(unsigned long x, unsigned long y) {
	return (y == 0) ? x : gcd(y, x%y);
}

unsigned long  lcm(unsigned long x, unsigned long y, unsigned long g) {
	return x / g*y;
}

int main() {
	while (1) {
		if (std::cin.eof())
			break;
		std::cin >> a >> b;
		unsigned long res1, ans;
		if (a < b)
			res1 = gcd(b, a);
		else
			res1 = gcd(a, b);
		ans = lcm(a, b, res1);
		std::cout << res1 <<' '<< ans << std::endl;
	}
	return 0;
}