Go: package main

import (
  "fmt"
)

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

func main() {
  var a,b,c int
  for _, err := fmt.Scan(&a, &b); err == nil; _, err = fmt.Scan(&a, &b) {
    c = gcd(a,b)
    fmt.Println(c, a*b/c)
  }
}

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

int main(){
  long a, b;
  long l, m, n;
  while (scanf("%d %d", &a, &b) != EOF){
    cin >> a >> b;
    m = a;
    n = b;

    while (1){
      if (m <= n){
        int t = m;
        m = n;
        n = t;
      }

      if (n == 0){
        cout << m << " " << a * b / m << "\n";
        break;
      }

      l = m % n;
      m = n;
      n = l;

    }

    if (a <= 0 || b <= 0){
      break;
    }
  }

  return 0;
}

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

#define REP(i, s, n) for(int i = s; i < n; ++i)
#define rep(i, n)		 REP(i, 0, n)
#define SORT(c)			 sort((c).begin(), (c).end())
#define IINF					INT_MAX
#define LLINF					LLONG_MAX
#define DEBUG					false

int main(){
    long long int a,b,r=1;
    cin>>a>>b;
    if(a<b){
        long long int temp;
        temp=b;
        b=a;
        a=temp;
    }
    long long int tempa=a,tempb=b;
    r=b;
    b=a;
    while(r!=0){
        a=b;
        b=r;
        r=a%b;

    }
    long long ans=tempa*tempb/b;
    cout<<b<<" "<<ans<<endl;
    return 0;
}

C++: #include <iostream>

using namespace std;

void swap(int *a, int *b)
{
	if(*b > *a) {
		int temp = *a;
		*a = *b;
		*b = temp;
	}
}

int main()
{
	int a, b;

	while (cin >> a >> b)
	{
		int A = a, B = b;
		while (a != b) {
			swap(&a, &b);

			a -= b;
		}

		cout << a << ' ' << (A/a)*B << endl;
	}

	return 0;
}

C++: #include <iostream>

/* ユークリッドの互除法 */
int _euclidean_algorithm(int a, int b)
{
    if (a % b == 0){
        return b;
    }
    return _euclidean_algorithm(b, a % b);
}

/* Greatest common divisor */
int gcd(int a, int b)
{
    return _euclidean_algorithm(a, b);
}

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

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

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

using namespace std;

double gcd(int x, int y);

int main(void) {
	while(1) {
		int x, y;
		double G, L;
		cin >> x;
		if( cin.eof() ) { break; }
		cin >> y;
		
		G = gcd(x, y);
		L = (double)x * (double)y / G;
		printf("%.0f %.0f\n", G, L);
	}
	return 0;
}

double gcd(int x, int y) {
	int t;
	while(y != 0) {
		t = x % y;
		x = y;
		y = t;
	}
	return x;
}

C++: #include <iostream>
using namespace std;
int main(){
  int a,a2,i=1,j=1,b,b2;
  cin>>a>>b;
  while(1){
    a2=a*i;
    b2=b*j;
    if(a2==b2)break; 
    else if(a2<b2)i++;
    else j++;
  }  
  if(a<b){
    for(i=2;i<a+1;i++)
      if(a%i==0 && b%i==0)break;
      cout<<i<<endl;
  }
  else {
      for(i=2;i<b+1;i++)
	if(a%i==0 && b%i==0)break;
      cout<<i<<endl;
  } 
  cout<<a2<<endl; 
  return 0;
}

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

using namespace std;

int find_GCD(int a, int b){
  int max = 0;
  for(int i=min(a, b)/2;i>0;i--){
    if(a%i==0 && b%i==0){
      max = i;
      break;
    }
  }
  return max;
}

int find_LCM(int a, int b){
  int LCM;
  for(int i = max(a, b)+1;;i++){
    if(i%a==0 && i%b==0){
      LCM = i;
      break;
    }
  }

  return LCM;
}

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

}

C++: #include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
const ll MOD = 1e9 + 7/*998244353*/;
const ll INF = 1LL << 60;
ll mod_pow(ll, ll, ll); ll mod_fact(ll, ll); ll mod_inv(ll, ll); ll gcd(ll, ll); ll lcm(ll, ll);
//
int main(){
    ll a, b;
    while(cin >> a >> b){
        cout << gcd(a, b) << " " << lcm(a, b) << "\n";
    }
}
/*⠀⠀⠀⠀⠀⢀⣀⣀⣀    
⠀⠀⠀⠰⡿⠿⠛⠛⠻⠿⣷
⠀⠀⠀⠀⠀⠀⣀⣄⡀⠀⠀⠀⠀⢀⣀⣀⣤⣄⣀⡀
⠀⠀⠀⠀⠀⢸⣿⣿⣷⠀⠀⠀⠀⠛⠛⣿⣿⣿⡛⠿⠷
⠀⠀⠀⠀⠀⠘⠿⠿⠋⠀⠀⠀⠀⠀⠀⣿⣿⣿⠇
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠉⠁

⠀⠀⠀⠀⣿⣷⣄⠀⢶⣶⣷⣶⣶⣤⣀
⠀⠀⠀⠀⣿⣿⣿⠀⠀⠀⠀⠀⠈⠙⠻⠗
⠀⠀⠀⣰⣿⣿⣿⠀⠀⠀⠀⢀⣀⣠⣤⣴⣶⡄
⠀⣠⣾⣿⣿⣿⣥⣶⣶⣿⣿⣿⣿⣿⠿⠿⠛⠃
⢰⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡄
⢸⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡁
⠈⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠁
⠀⠀⠛⢿⣿⣿⣿⣿⣿⣿⡿⠟
⠀⠀⠀⠀⠀⠉⠉⠉
*/

//library//
ll mod_fact(ll a, ll mod){
    ll ans = 1;
    while(a > 1){
        ans = ans * a % mod;
        a--;
    }
    return ans; 
}
ll mod_pow(ll a, ll b, ll mod){
    ll ans = 1;
    while(b > 0){
        if(b & 1) ans = ans * a % mod;
        a = a * a % mod;
        b >>= 1;
    }
    return ans;
}
ll mod_inv(ll a, ll mod){
    return mod_pow(a, mod - 2, mod);
}
ll gcd(ll a, ll b){
    while(a % b){
        return gcd(b, a % b);
    }
    return b;
}
ll lcm(ll a, ll b){
    return a / gcd(a, b) * b;
}

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

int main()
{
	long a,b;
	while(cin>>a>>b)
	{
		/*long numerator=min(a,b);
		long denominator=max(a,b);
		long remainder = a % b;
		while(remainder !=0)
		{
			 numerator   = denominator;
			denominator = remainder;
			remainder   = numerator % denominator;
		}
		long gcd = denominator;
		long long lcm = a * (b / gcd);
		cout<<gcd<<" "<<lcm<<endl;
		*/
		long long gcd=1;
		for(long long i=min(a,b);i>0;i--)
		{
			if(a%i ==0)
				if(b%i==0)
				{
					gcd=i;;
					break;
				}
		}
		cout<<gcd<<" "<<a * (b / gcd)<<endl;
	}
}

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

int main() {
	long long int a, b, t, aa, bb;

	while (1) {
		cin>>a;
		if (cin.eof()) break;
		cin>>b;

		aa = a;
		bb = b;

		while (1) {
			if (b==0) break;

			t = b;
			b = a % b;
			a = t;
		}
		cout<<a<<" "<<aa*bb/a<<endl;
	}
	return 0;
}

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


int main()
{
	long a[100],b[100];
	int i=0;
	while(cin >> a[i] >> b[i]){i++;}
	for(int j=0;j<i;j++){
		long c;
		long d=a[j],e=b[j];
		if (a[j]<b[j]){c=a[j];a[j]=b[j];b[j]=c;}
		while(a[j]%b[j]!=0){
			c=a[j];
			a[j]=b[j];
			b[j]=c%b[j];
		}
		cout << b[j] <<" " <<d/b[j]*e <<  endl;
	}
    return 0;
}

C++: #include<stdio.h>
#include<iostream>
#include<iomanip>

#define ll long long
#define REP(i, a) for(int i=0;i<(int)a;++i)
using namespace std;

ll gcd(ll a, ll b) {
    if (a < b) swap(a, b);
    return b == 0 ? a : gcd(b, a % b);
}

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


void solver() {
    ll a, b;
    while (cin >> a >> b) {
        cout << __algo_gcd(a, b) << " " << lcm(a, b) << endl;
    }
}

int main() {
    solver();
    return 0;
}

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

long long a,b;

long long gcd(long long a,long long b){
  if(b == 0) 
    return a;
  else 
    return gcd(b, a % b);
}
long long lcm(long long a,long long b){
    return (a * b) / gcd(a, b);
}

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

C++: #include <iostream>

using namespace std;
typedef long long LL;

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

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

int main(){
  LL x, y;
  while(true){
	if(!(cin >> x >> y)) return 0;
	cout << gcd(x,y) << " " << lcm(x,y) << endl;
  }
  return 0;
}

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

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

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

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

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