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<iostream>
#include<list>
#define MAX(a,b) ((a) > (b) ? (a) : (b))
#define MIN(a,b) ((a) > (b) ? (b) : (a))
using namespace std;


int main(){
	long a,b,r,x,y;
	list<long> aby;
	
	while(!(cin>>a>>b).eof()){
		x=a,y=b;
		while(1){
			r=MAX(x,y)%MIN(x,y);
			if(r==0) break;
			x=MIN(x,y);
			y=r; 
		}
		aby.push_back(a);
		aby.push_back(b);
		aby.push_back(y);
		
	}
	list<long>::iterator it = aby.begin();
	while(it != aby.end()){
		a = *it, it++;
		b = *it, it++;
		y = *it;
		cout << y << " "<<(a*b)/y <<endl;
		it++;
	}
	
	return 0;
}

C++: #include <iostream>
#include <string>
#include <stack>
#include <math.h>
#include <algorithm>
#include <cstdlib>
#include <ctime>
#include <vector>

using namespace std;

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



int main()
{
	int a, b;
	while (cin >> a) {
		cin >> b;
		cout << gcm(a, b) << " " << (a*b) / gcm(a, b) << endl;
	}
		





}

C++: #include <iostream>

using namespace std;

int a, b;
int g, l;

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

int main(void)
{
	while(1){
		cin >> a;
		if(cin.eof()) break;
		cin >> b;
		
		g = gcd(a, b);
		l = a / g * b;
		cout << g << " " << l << endl;
	}
	return 0;
}

C++: #include<cstdio>
#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, int ans_gcd) {
  int ans;
  
  ans = a / ans_gcd * b;

  return ans;
}
     
     
     
     
int main(){
  int a, b;
  int ans_gcd, ans_lcm;

  while (1){//cin >> a >> b) {
    cin >> a >> b;
    if((a == 0) && (b == 0)) break;

    ans_gcd = gcd(a, b);
    ans_lcm = lcm(a, b, ans_gcd);

    cout << ans_gcd << " " << ans_lcm << endl;
  }

  return 0;
}

C++: #include <iostream>
 
typedef unsigned int ui;
 
void swap(ui & a, ui & b)
{
    unsigned int tmp = a;
    a = b;
    b = tmp;
}
 
ui gcd(ui a, ui b)
{
    if (a < b) swap(a, b);
 
    ui c = a % b;
    while (c != 0) {
        a = b;
        b = c;
        c = a % b;
    }
 
    return b;
}
 
int main() {
    using namespace std;
 
    ui a, b;
    while (cin >> a >> b) {
        const ui GCD = gcd(a, b);
        const ui LCM = a * (b / GCD);
        cout << GCD << ' ' << LCM << endl;
    }
    return 0;
}

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

int main()
{
	int a, b;
	int temp;
	while (cin >> a >> b)
	{
		if (a < b)
		{
			temp = a;
			a = b;
			b = temp;
		}
		int a_ = a, b_ = b;
		while (a_ % b_ != 0)
		{
			temp = a_ % b_;
			a_ = b_;
			b_ = temp;
		}
		cout << b_ << " " << b / b_ * a << endl;
	}

	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
#define rep(i,a,n) for (int i=a;i<n;i++)
#define per(i,a,n) for (int i=n-1;i>=a;i--)
#define pb push_back
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define fi first
#define se second
#define SZ(x) ((int)(x).size())
typedef vector<int> vii;
typedef long long ll;
typedef pair<int,int> pii;
const ll mod=1000000007;
ll powmod(ll a,ll b) {ll res=1;a%=mod; assert(b>=0); for(;b;b>>=1){if(b&1)res=res*a%mod;a=a*a%mod;}return res;}
ll gcd(ll a,ll b) { return b?gcd(b,a%b):a;}
// head
long long a,b;
long long GCD,LCM;
int main()
{
    while(~scanf("%lld %lld",&a,&b))
    {
        GCD=gcd(a,b);
        LCM=a/GCD*b;
        printf("%lld %lld\n",GCD,LCM);
    }
}

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

using namespace std;

int getLCM(int, int);
int getGCD(int, int, int);

int main(int argc, char *argv[]) {
  int x, y;
  vector<int> result;

  while (cin >> x >> y) {
    int lcm = getLCM(x, y);
    int gcd = getGCD(x, y, lcm);
    result.push_back(lcm);
    result.push_back(gcd);
  }
  for (int i = 0; i < result.size()/2; i++)
    cout << result[i*2] << ' ' << result[i*2+1] << endl;
  return 0;
}

int getLCM(int x, int y) {
  int tmp;

  if (x < y) {
    tmp = y;
    y = x; 
    x = tmp;
  }
  while (x % y != 0) {
    tmp = x % y;
    x = y;
    y = tmp;
  }
  return y;
}

C++: #include <stdio.h>

int main( ){
    float a[20],b[20];
    int nCount;
    for( int i = 0;scanf( "%f %f",&a[i],&b[i] ) != EOF;i++ ) nCount = i;

    for( int k = 0;k < i;k++ ){
         float buf_a = a[k],buf_b = b[k];

        while( buf_a != buf_b ){
            if( buf_a < buf_b ) buf_a += a[k];
            else                      buf_b += b[k];
        }
        printf( "%d ",( int )buf_a );
        int m,n;
        if( a[k] < b[k] ) m = b[k],n = a[k];
        else if( a[k] > b[k] ) n = b[k],m = a[k];
        else {
            printf( "%d\n",a[k] );
            continue;
        }
        while( true ){
            int buf = n;
            n = m % n;
            m = buf;
            if( n == 0 ) {
                printf( "%d\n",m );
                break;
            }
        }
    }
    return 0;
}

C++: //C++14 (Clang 3.8.0)

#include <vector>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <string>
using namespace std;
typedef pair<int,int> P;
typedef unsigned long long ll;
ll gcd(ll x,ll y){
    ll ma=max(x,y),mi=min(x,y),ama=ma%mi;
    if(ama==0) return mi;
    else return gcd(mi,ama);
}
ll lcm(ll x,ll y){
    ll g=gcd(x,y);
    if(g==1) return x*y;
    return g*lcm(x/g,y/g);
}
int main(){
    ll a,b;
    while(scanf("%lld %lld", &a, &b)!=EOF){
        cout<<gcd(a,b)<<" "<<lcm(a,b)<<endl;
    }
    return 0;
};

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


class GcdAndLcm
{
public:
    GcdAndLcm() : m_gcd(0), m_lcm(0) {}
    void Run();

private:
    void readData();
    void GetData(std::string s, int& v1, int& v2);
    int calcGcd(int m, int n);
    int calcLcm(int m, int n);
    void Show();

private:
    std::vector<std::string> m_data;
    unsigned int m_gcd;
    unsigned int m_lcm;
};

void GcdAndLcm::Run()
{
    int val1 = 0, val2 = 0;

    readData();
    
    for (unsigned int i = 0; i < m_data.size(); ++i) {
        GetData(m_data[i], val1, val2);
        m_gcd = calcGcd(val1, val2);
        m_lcm = calcLcm(val1, val2);
        Show();
    }
}
void GcdAndLcm::readData()
{
    std::string line;

    while (std::getline(std::cin, line)) {
        m_data.push_back(line);
    }
}

void GcdAndLcm::GetData(std::string s, int& v1, int& v2)
{
    size_t pos = s.find(" ");
    char tmp[100] = { 0 };
    std::strncpy(tmp, s.c_str(), pos);
    v1 = std::atoi(tmp);
    std::memset(tmp, 0x00, sizeof(tmp));
    pos++;
    std::strncpy(tmp, s.c_str() + pos, s.size() - pos);
    v2 = std::atoi(tmp);
}
int GcdAndLcm::calcGcd(int m, int n)
{
    if ((0 == m) || (0 == n))
        return 0;

    while (m != n)
    {
        if (m > n) m = m - n;
        else         n = n - m;
    }
    return m;
}//gcd

int GcdAndLcm::calcLcm(int m, int n)
{
    if ((0 == m) || (0 == n))
        return 0;

    return ((m / calcGcd(m, n)) * n); // lcm = m * n / gcd(m,n)
}//lcm

void GcdAndLcm::Show()
{
    std::cout << m_gcd << " " << m_lcm << std::endl;
}

int main()
{
    GcdAndLcm gcdAndLcm;

    gcdAndLcm.Run();
}