Go: package main

import "fmt"

func main() {
	var a, b int
	var gcd, lcm int

	for {
		_, err := fmt.Scanf("%d %d", &a, &b)
		if err != nil {
			return
		}

		var big, small int
		// GCD
		if a > b {
			big = a
			small = b
		} else {
			big = b
			small = a
		}

		for {
			if big%small == 0 {
				gcd = small
				break
			} else {
				small, big = big%small, small
			}
		}

		// LCM
		lcm = a * b / gcd

		fmt.Println(gcd, lcm)
	}
}

C++: 

#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <vector>
#include <string>
#include <queue>
#include <algorithm>
#include <math.h>
#include <utility>
#include <set>
#include <map>
#define INF 100000
using namespace std;

int gcd(int n, int m){
    if (n>=m) {
        if(n%m>0){
            return gcd(m,n%m);
        }else{
            return m;
        }
    }else{
        return gcd(m,n);
    }
}

int main(){
    double a,b;
    while (cin >> a ,cin >> b) {
        int g = gcd(a,b);
        int l = a*b/g;
        cout <<g<<" "<<l;
    }
}

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

typedef long long ll;

int main(){
    ll m, n;
    while(scanf("%lld%lld", &m, &n) == 2){
        if(m > n){
            ll t = m;
            m = n;
            n = t;
        }
        ll r, a = m, b = n;
        while(n % m != 0){
            r = n % m;
            n = m;
            m = r;
        }
        printf("%lld %lld\n", r, a / r * b);
    }
}

C++: #include <iostream>

using namespace std;

int main()
{
	
	int a, b, c = 0;
	while (cin >> a, cin >> b)
	{
		for (int i = 1; i <= a, i <= b; i++)
		{
			if (a % i == 0 && b % i == 0)
			{
				c = i;
			}
		}
		cout << c << " " << a*b / c << endl;
	}
	getchar();
	getchar();
	return 0;
}

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

int main()
{
	int lam,gcd,a,b,c,d;
	while(cin>>a>>b)
	{
		c=a;
		d=b;
		if(a<b)
		{
			a=a+b;
			b=a-b;
			a=a-b;
		}
		while(a%b!=0)
		{
			int temp;
			temp=b;
			b=a%b;
			a=temp;
		}
		gcd=b;
		lam=d/gcd*c;
		printf("%d %d\n",gcd,lam);
	}
	return 0;
}

C++: #define _CRT_SECURE_NO_WARNINGS // #pragma warning(disable:4996)
#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <vector>
#include <string>
#include <queue>
#include <functional>
#include <sstream>
#include <cmath>
#include <set>
#include <map>
#include <stack>
using namespace std; 

#define rep(i,a,b) for(int i=(a);i<(b);i++)
#define rrep(i,a,b) for(int i=(a);i>=(b);i--)
#define pb push_back
#define mp(a,b) make_pair(a,b)
#define all(a) a.begin(),a.end()
#define len(x) ((int)(x).size())
#define tmax(a,b,c) max((a),max((b),(c)))
#define tmin(a,b,c) min((a),min((b),(c)))
#define debug(x) cerr << #x << " is " << x << endl;

typedef pair<int, int> Pii;
typedef map<int, int> Mii;
typedef vector<int> Vi;
typedef vector<vector<int> > VVi;
typedef long long ll;
const int inf = 2e9;
const ll ll_inf = 1e17;
const int mod = 1e9 + 7;
const long double eps = 1e-10;
typedef pair<ll, ll> Pll; 
#define PI 3.14159265

ll gcd(ll a, ll b) {
	if (a < b) swap(a,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;
	}
}

C++: #include <iostream>
#include <utility>
 
using namespace std;
 
int gcn(int a,int b){
if(a < b){swap(a,b);} 
while(b != 0){
a = a%b;
swap(a,b);
}
return a;
}
 
int main() {
	int n;int m;
while(cin >> n >> m){
cout << gcn(n,m) << " " << n/gcn(n,m) *m << endl;
}
	return 0;
}

C++: #include<iostream>

using namespace std;

long long int a,b;

int main(void)
{
	while(cin>>a>>b){
	//a=625; b=25;
		long long int x,y;
		x=1;
		for(int i=2;i<=a&&i<=b;){
			if(a%i==0&&b%i==0){
				x=x*i;
				a=a/i;
				b=b/i;
				i=2;
			}
			i++;
		}
		y=x*a*b;
		cout<<x<<" "<<y<<endl;
		//cin>>a;
	}
}

C++: #include<stdio.h>
int main(void)
{
    int  a,b,c,x,y;
	long long i;
	while(scanf("%d %d",&a,&b)!=EOF){
		i=(long long)a*b;
		if(a<b){
			c=a;
			a=b;
			b=c;
		}
		c=a%b;
		while(c!=0){
			a=b;
			b=c;
			c=a%b;
		}
		i=(long long)i/b;
		printf("%d %lld\n",b,i);
	}
	return 0;
}

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

int gcd(int x,int y){
  if(y == 0) return x;
  return  gcd(y,x%y);
}

int lcm(int x,int y){
  int g = gcd(x,y);
  return (x/g)*y;
}

int main(){
  int x,y;
  while(scanf("%d%d",&x,&y) != EOF) cout << gcd(x,y)<<" "<<lcm(x,y)<<endl;
  return 0;
}

C++: #include<iostream>
long long gcd(long long a,long long b){
  if(b==0) return a;
  gcd(b,(a%b));
}

int main() {
  long long i,j,res;
  while(std::cin>>i>>j) {
    res=gcd(i,j);
    std::cout<<res<<" "<<(i*j)/res<<"\n";
  }
}

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

int main() {
int a,b,e,f,l;
	while(cin>>a>>b){
		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;
}

C++: #include <iostream>
using namespace std;
int main() {
	int a, b, m, n, tmp;
	while(cin >> a >> b) {
		if(a > b) {
			m = a;
			n = b;
		} else {
			m = b;
			n = a;
		}
		while(n != 0) {
			tmp = n;
			n = m % n;
			m = tmp;
		}
		tmp = a * b / m;
		cout << m << " " << tmp << endl;
	}
	return 0;
}

C++: using namespace std;

// GCD
template<class T> inline T gcd(T a, T b) {
    return (a == b) ? a : gcd(b % a, a);
}

// LCM
template<class T> inline T lcm(T a, T 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;
    }    
    return 0;
}

C++: #include<cstdio>
#include<algorithm>
using namespace std;
typedef unsigned long long ull;
ull gcd(ull m,ull n)
{
    ull t;
    ull a=max(n,m),b=min(n,m);
    while(1)
    {
        t=b;
        if(a%b==0) return b;
        b=a%b;
        a=t;
    }
}
ull lcm(ull m,ull n)
{
    return m/gcd(n,m)*n;
}
int main()
{
    ull a,b;
    while(~scanf("%I64d%I64d",&a,&b))
    {
        printf("%I64d %I64d\n",gcd(a,b),lcm(a,b));
    }
    return 0;
}

C++: #pragma region Macros
#include <bits/stdc++.h>

#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(a) (a).begin(), (a).end()
#define SZ(x) ((int)(x).size())
#define IN(x, a, b) x >= a and x < b

using namespace std;
using ll = long long;

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;
}
template <typename T> constexpr T INF = numeric_limits<T>::max() / 2;
#pragma endregion

ll gcd(ll x, ll y) {
  if (y == 0) {
    return x;
  }
  return gcd(y, x % y);
}

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);

  ll x, y;
  REP(i, 50) {
    if (cin >> x >> y) {
      ll d = gcd(x, y);
      cout << d << ' ' << x * y / d << endl;
    }
  }

  return 0;
}

C++: #include <stdio.h>
 int gcd(int x, int y){
 if(x%y == 0)
  return y;
 else
  return (gcd(y, x%y)); }

 int main(void){
 long long int x, y;
 while(scanf("%lld %lld", &x, &y)>0){
 long long int lcm=(x*y)/gcd(x, y);
 if(lcm == 0) break;
 printf("%lld %lld\n", gcd(x,y), lcm); }
 return 0;
}

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

using namespace std;

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

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

int main(){
	long long int a,b;
	
	while(scanf("%lld %lld",&a,&b) != EOF){
		cout << gcd(a,b) << " " << lcm(a,b) <<  endl;
	}
	return 0;
}

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

int main(){
    unsigned int a,b,c;
    int g[50],l[50];
    int p;
    for(int i=0;i<50;i++;){
        cin>>a>>b;
        p=a*b;
        while(b!=0){
            c=b;
            b=a%b;
            a=c;
        }
        g[i]=a;
        l[i]=p/g[i];
    }
    for(int i=0;i<50;i++;){
        cout<<g[i]<<" "<<l[i]<<endl;
    }
    return(0);
}