Go: package main

import (
	"fmt"
	"os"
	"bufio"
)

func main() {
	sc := bufio.NewScanner(os.Stdin)

	for sc.Scan() {
		var a, b int
		fmt.Sscanf(sc.Text(), "%d %d", &a, &b)
		gcd := gcd(a, b)
		fmt.Printf("%d %d\n", gcd, (a/gcd)*b )
	}
}

func gcd(a int, b int) (gcd int) {
	var i, j, k int
	if a > b {
		i = a
		j = b
	} else {
		i = b
		j = a
	}

	k = i % j

	for k > 0 {
		num := i
		i = j
		j = num % i
		k = i % j
	}

	return j
}

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

int main(){
  long a, b;
  long l, m, n;
  while (scanf("%ld %ld", &a, &b) != EOF){
    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 <iostream>
#include <cstdio>
using namespace std;

int gcd(int a, int b) {
   
     int p,q,r;
     if(a<b) {return gcd(b, a);}
    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;

int gcd(int a,int b){
    int c;
    if(a<b){
        a+=b;
        b=a-b;
        a-=b;
    }
    while(b!=0){
        c=a%b;
        a=b;
        b=c;
    }
    return a;
}
 
int main(){
    int data0,data1;
    int answer;
    while(cin>>data0>>data1){
        answer=gcd(data0,data1);
        cout<<answer<<" "<<data0/answer*data1<<endl;
    }
}

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

template <typename T>
T gcd(T a , T b){
	if (a<b) {
		a^=b;
		b^=a;
		a^=b;
	}
	return a%b ? gcd(a , a%b) : b;
}

int main(){
	int a , b ;
	while(cin>>a>>b){
		printf("%d %d\n" , gcd(a,b) , (a/gcd(a, b)*b));
	}
	return 0;
}

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

long int gcd(long int a,long int b){
    if(!(a%b)) return b;
    return gcd(b,a%b);
}
int main(){
    long int x,y;
    while(cin >> x >> y)
        cout << gcd(x,y) << " " << x*y/gcd(x,y) << endl;
    return 0;
}

C++: #include <cstdio>

int dp[30000010];
typedef long long ll;

ll gcd(ll a, ll b)
{
	return b ? gcd(b, a % b) : a;
}

ll lcm(ll a, ll b)
{
	return a / gcd(a, b) * b;
}
int main(int argc, char const *argv[])
{
	ll x, y;
	while(~scanf("%lld %lld", &x, &y))
	{
		printf("%lld %lld\n", gcd(x, y), lcm(x, y));
	}
	return 0;
}

C++: #include <stdio.h>

int main( void ){
    unsigned 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++ ){
        unsigned 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++: #include<cstdio>
#include<iostream>
using namespace std;
#define ull unsigned long long
ull a, b, ans;

ull gcd(ull a, ull b){
	return b == 0 ? a : gcd(b, a % b);
}

ull lcm(ull a, ull b, ull GCD){
	a = a / GCD;
	b = b / GCD;
	return a * b * GCD;
}


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

C++: #include <iostream>

using namespace std;

int main() {
    long long a, b, r, mul;
    while (cin >> a >> b) {
        mul = a * b;
        while ((r = a % b) != 0) {
            a = b;
            b = r;
        }
        cout << b << " " << mul / b << endl;
    }

    return 0;
}

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

#define MAX 256

int main(void){
	
	long max[50], min[50];
	for (long i = 0; i < 50; i++){
		max[i] = 0;
		min[i] = 0;
	}

	long a, b;
	long i = 0;

	while (scanf("%d%d", a, b) != EOF){
		while (max[i] == 0){
			for (long j = 0; j > 0; j--){
				if (a%j == 0 && b%j == 0)max[i] = j;
			}
		}
		long j = 1;
		while (min[i] == 0){
			if ((a*j) % b == 0)min[i] = a*j;
			j++;
		}
		i++;
	}

	for (long j = 0; j < i; j++){
		printf("%d %d\n", max[j], min[j]);
	}

	return 0;
}

C++: #include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <climits>
#include <cfloat>
#include <ctime>
#include <map>
#include <utility>
#include <set>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <sstream>
#include <complex>
#include <stack>
#include <queue>
#include <numeric>
#include <list>

using namespace std;

#ifdef _MSC_VER
#define __typeof__ decltype
template <class T> int __builtin_popcount(T n) { return n ? 1 + __builtin_popcount(n & (n - 1)) : 0; }
#endif

#define foreach(it, c) for (__typeof__((c).begin()) it=(c).begin(); it != (c).end(); ++it)
#define all(c) (c).begin(), (c).end()
#define rall(c) (c).rbegin(), (c).rend()
#define popcount __builtin_popcount

#define rep(i, n) for (int i = 0; i < n; ++i)

template <class T> void max_swap(T& a, const T& b) { a = max(a, b); }
template <class T> void min_swap(T& a, const T& b) { a = min(a, b); }

typedef long long ll;
typedef pair<int, int> pint;

const double PI = acos(-1.0);
const int dx[] = { 0, 1, 0, -1 };
const int dy[] = { 1, 0, -1, 0 };


template <class T>
T gcd(T a, T b)
{
	if (a < b) return gcd(b, a);
	if (b) return gcd(b, a % b);
	else return a;
}
template <class T> T lcm(T a, T b) { return a / gcd(a, b) * b; }

int main()
{
	int a, b;
	while (~scanf("%d%d", &a, &b))
		printf("%d %d\n", gcd(a, b), lcm(a, b));
}

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

int main () {
    int a, b, c, d, e, f, g, l;
    cin >> a >> b;
    c = e = a; d = f = b;
    while(1) {
        if(a>b) {
            a %= b;
            if(b==0) {g =b; break;}
        }
        else if(a<b) {
            b %= a;
            if(a==0) {g= a; break;}
        }
    }
    while(1) {
        if(c>d) d += f;
        else if(c<d) c += e;
        if(c == d) l = c;
    }
    cout << g << " " << l << endl;
}

C++: #include <iostream>
#define ll long long
using namespace std;
ll gcd(ll a,ll b)
{
	return b==0 ? a :gcd(b,a%b);
}
int main()
{
	ll x, y;
	while(~scanf("%I64d%I64d",&x,&y))
	{
		ll ans=gcd(x,y);
		printf("%I64d %I64d\n",ans,x/ans*y);
	}
}

C++: #include<iostream>
using namespace std;
int euclid(int a,int b) {
  if(a<b) {
    int tmp=a;
    a=b;
    b=tmp;
  }
  if(a%b==0) return b;
  return euclid(b,a%b);
}

int main() {
  int a=0;
  int b=0;
  while(cin>>a>>b) {
    int n=euclid(a,b);
    cout<<n<<" "<<(a*b)/n<<endl;
  }
  return 0;
}

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

using namespace std;

int gcd (int a, int b)
{
	if (a > b ){
		swap (a, b );
	} // end if
	while (b % a != 0 ){
		b = b % a;
		if (a > b ){
			swap (a, b );
		} // end if
	} // end while

	return a;
}

int lcm (int a, int b )
{
	int res = a / gcd (a, b );
 	res *= b;

	return res;
}

int main()
{
//	cut here before submit 
//	freopen("testcase.gl", "r", stdin);
	string str = "";

	while (getline (cin, str ) ) {
		int a, b;
		stringstream ss (str );
		ss >> a >> b;
		cout << gcd (a, b ) << ' ' << lcm (a, b ) << endl;
	} // end for

	return 0;
}