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 <algorithm>
#include <cmath>
#include <climits>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <fstream>
#include <iostream>
#include <list>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <cassert>
#include <functional>

using namespace std;

#define LOG(...) printf(__VA_ARGS__)
//#define LOG(...)
#define FOR(i,a,b) for(int i=(int)(a);i<(int)(b);++i)
#define REP(i,n) for(int i=0;i<(int)(n);++i)
#define ALL(a) (a).begin(),(a).end()
#define RALL(a) (a).rbegin(),(a).rend()
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define SORT(c) sort((c).begin(),(c).end())
#define RSORT(c) sort((c).rbegin(),(c).rend())
#define CLR(a) memset((a), 0 ,sizeof(a))

typedef long long ll;
typedef unsigned long long ull;
typedef vector<bool> vb;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<vb> vvb;
typedef vector<vi> vvi;
typedef vector<vll> vvll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int dx[] = { -1, 0, 1, 0 }; const int dy[] = { 0, 1, 0, -1 };
bool sosuub[50000];
vector<int> sosuu;
int max(int a, int b){
	int ans=1;
	int ac=a;
	int bc=b;
	vector<int> va;
	vector<int> vb;
	for (int i = 0; ac >= sosuu[i];){
		if (ac%sosuu[i] == 0){
			ac /= sosuu[i];
			va.push_back(sosuu[i]);
		}
		else i++;
	}
	for (int i = 0; bc >= sosuu[i];){
		if (bc%sosuu[i] == 0){
			bc /= sosuu[i];
			vb.push_back(sosuu[i]);
		}
		else i++;
	}
	while (!va.empty() && !vb.empty()){
		if (va.back() == vb.back()){
			ans *= va.back();
			va.pop_back();
			vb.pop_back();
		}else{
			if (va.back() > vb.back())va.pop_back();
			else if (va.back() < vb.back())vb.pop_back();
		}
	}
	return ans;
}
int min(int a, int b){
	int ans=-1;

	return ans;
}

int main() {
	int a, b;
	for (int i = 2; i < 50000; i++){
		if (!sosuub[i]){
			sosuu.push_back(i);
			for (int j = i * 2; j < 50000; j += i){
				sosuub[j] = true;
			}
		}
	}
	while (cin >> a >> b){
		int ma = max(a, b);
		int mi = a / ma*b;
		cout << ma<< " " << mi << endl;
	}
}

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

using lint = long long;

lint gcd(lint x, lint y){
    lint r = x % y;
    while(r != 0LL){
        x = y;
        y = r;
        r = x % y;
    }
    return y;
}

lint lcm(lint x, lint y){
    return x / gcd(x, y) * y;
}

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

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

using namespace std;

int GCD(const int& a, const int& b) {
	if (b == 0) {
		return a;
	}
	return GCD(b, a%b);
}

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

C++: #include<stdio.h>
#include<stdlib.h>
#include<iostream>
#include<string>
#include<algorithm>
#include<vector> 
#include<limits>
#include<numeric>
#include<math.h>
using namespace std;

#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define in(x) cin >> x
#define out(str) cout << str << endl

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; }

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

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

C++: /*****include*****/
#include <iostream>
#include <fstream>

/*****デバッグ定義*****/
//#define DEBUG
/*****マクロ定義*****/

/*****名前空間*****/
using namespace std;

/*****グローバル変数置き場*****/

/*****その他関数置き場*****/
long long int find_gcd(long long int int_a,long long int int_b){
	if(int_a == 0)	return int_b;
	else			return find_gcd(int_b%int_a,int_a);
}
/*****main関数*****/
int main(){
	/*****ファイルオープン*****/
#ifdef DEBUG
	ofstream fout("output.txt");
	ifstream fin("input.txt");
	if(!fout || !fin){
		cout << "Can't open the file.\n";
		return;
	}
#endif
	/*****変数置き場*****/
	
	
	
	/*****処理部*****/
	long long int int_a,int_b;
	long long int gcd,lcm;
	while(1){
		cin >> int_a >> int_b;
		gcd = find_gcd(int_a,int_b);
		lcm = int_a * int_b / gcd;
		cout << gcd << " " << lcm << endl;
	}
	/*****処理終了後*****/
#ifdef DEBUG
	fout.close();
	fin.close();
#endif
	return 0;
}

C++: #include<stdio.h>

int min(int a,int b){
  int t=a;
  if(t>b) t=b;
  return t;
}

int main(void){
  int a,b,g,l;
  int m;
  /*  char line[100];

  fgets(line,sizeof(line),stdin);
  sscanf(line,"%d %d",&a,&b);
  */
  m=min(a,b);
  int i=m;
  for(i;i>=1;i--){
    if(a%i==0 && b%i==0){
      g=i;
      i=0;
    }
  }

  l=a*b/g;

  printf("%d %d",g,l);
  return 0;
}

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 < a || i < b; i++){
			if(c%i==0&&d%i==0){
				c/=i;
				d/=i;
				lcm=gcd*=i;
			}
		}
		lcm*=c*d;
		cout << gcd << " " << lcm << endl;
	}
	return 0;
}

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

int main(void)
{
	int a, b;
	while(cin >> a >> b){
		int max = 1, min = 1;
		for (int i = 2; ; ++i)
		{
			if(a % i == 0 && b % i == 0){
				a /= i;
				b /= i;
				max *= i;
				min *= i;
				i--;
			}
			if(a / i == 0 && b / i == 0){
				break;
			}
		}
		min *= a * b;
		cout << max << " " << min << endl;
	}
}

C++: #include <iostream>
#include <cmath>
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;
    }
    return 0;
}

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

long long gcd(long long a, long long b){
  if(a < b) swap(a, b); 
  if(a % b == 0) return b;
  else return gcd( a - b, b);
}

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