Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

var sc = bufio.NewScanner(os.Stdin)
var out = bufio.NewWriter(os.Stdout)

func main() {
	sc.Split(bufio.ScanLines)
	defer out.Flush()

	for sc.Scan() {
		x, y := nextInts()
		if x < y {
			rep := x
			x, y = y, rep
		}
		gcd := x % y
		lcm := x * y
		for gcd != 0 {
			x, y, gcd = y, gcd, x%y
		}
		fmt.Fprintf(out, "%d %d\n", y, lcm/y)
	}

}

func nextInts() (a, b int) {
	s := strings.Split(sc.Text(), " ")
	ra, _ := strconv.Atoi(s[0])
	rb, _ := strconv.Atoi(s[1])
	a = ra
	b = rb
	return
}

C++: #include <iostream>
#include <vector>
using namespace std;
typedef long long bignum;
struct xy
{
	long long x;
	long long y;
};

int getGCD(int a, int b) {
	if (b != 0)
		return getGCD(b, a%b);
	else
		return a;
}
int main()
{
	int a, b;
	vector<xy> dst;
	while (cin >> a >> b ) {
		int GCD = a > b ? getGCD(a, b) : getGCD(b, a);
		bignum LCD = bignum(a) * bignum(b) / bignum(GCD);
		dst.push_back({ GCD ,LCD });
	}
	for (vector<xy>::iterator it = dst.begin(); it < dst.end(); it++)
		cout << (*it).x << " " << (*it).y << endl;
	return 0;
}

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 <iomanip>
#include <cmath>

using namespace std;

double a, b, c, d, e, f;


double x(double, double, double, double, double, double) {

	return (c*e - b*f) / (a*e - b*d);
}

double y(double, double, double, double, double, double) {

	return (a*f - c*d) / (a*e - b*d);
}

double round(double dat, int keta ){

	int fct;
	fct = (int)pow(10, keta - 1);
	dat *= fct;
	dat += (dat < 0) ? -0.5 : 0.5;
	dat = (int)dat;
	dat /= fct;
	return dat;
}

int main()
{
	double x1, x2, y1, y2;
	cin >> a >> b >> c >> d >> e >> f;

	x1 = x(a, b, c, d, e, f);
	y1 = y(a, b, c, d, e, f);

	cin >> a >> b >> c >> d >> e >> f;

	x2 = x(a, b, c, d, e, f);
	y2 = y(a, b, c, d, e, f);

	cout << fixed << setprecision(3) << round(x1,4) << " " << round(y1,4) << endl;
	cout << fixed << setprecision(3) << round(x2,4) << " " << round(y2,4) << endl;

	return 0;
}

C++: #include <stdio.h>

int main(){
 
    int buf1[50],buf2[50];
 
    int k = 0;
    while( scanf( "%d %d",&buf1[k],&buf2[k] ) != EOF ) k++;
 
    for( int i = 0;i < k;i++ ){
        int b1 = buf1[i],b2 = buf2[i];
        int m,n;
        if( b 1< b2 ){
            m = b2,n = b1;
        } else if( b1 > b2 ){
            m =  b1,n = b2;
        } else printf( "%d ",b2 );
 
        while( true ){
            int buf = n;
            n = m % n;
            m = buf;
            if( n == 0 ){
                printf( "%d\n",m );
                break;
        }
        while( b1 != b2 ){
            if( b1 < b2 ) b1 += buf1[i];
            else             b2 += buf2[i];
        }
        printf( "%d\n",b1 );
    }
    reutrn 0;
}

C++: #include<iostream>

int main(){
	int a, b, r;
	
	while(std::cin >> a >> b){
		int product = a*b;
		
		// GCD
		if(a < b){
			int temp = a;
			a = b;
			b = temp;
		}
		while((r = a%b) != 0){
			a = b;
			b = r;
		}
		
		// GCD show
		std::cout << b << std::endl;
		
		// LCM
		int lcm = product / b;

		//LCM show
		std::cout << lcm << std::endl;
	}
	
	return 0;
}

C++: #include <stdio.h>

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

int lcm( int m, int n)
{
int gcd( int, int);
return( m * n / gcd (m , n));
}

int main()
{
int m, n , lcm( int, int), gcd( int ,int);
while(scanf("%d%d", &m,&n)==2){
printf("%d", gcd( m, n));
printf(" %d", lcm(m , n));}
return 0;
}

C++: #include <functional>
#include <algorithm>
#include <iostream>
#include <sstream>
#include <cstring>
#include <iomanip>
#include <fstream>
#include <climits>
#include <cctype>
#include <cstdio>
#include <string>
#include <vector>
#include <bitset>
#include <queue>
#include <stack>
#include <cmath>
#include <ctime>
#include <deque>
#include <list>
#include <map>
#include <set>
using namespace std;

/*** typedef ***/
typedef long long LL;
typedef unsigned int ui;
typedef unsigned long long ULL;
typedef pair < int , int > ii;
typedef pair < LL  , LL  > ll;
typedef vector <int>  vint;
typedef vector <bool> vbool;
typedef vector <long> vlong;

/*** define ***/
#define sz(x)			((int)x.size())
#define tin(x)			scanf("%d",&x)
#define all(x)			x.begin(),x.end()
#define Set(b,a)		memset(b,a,sizeof b)
#define print1(x)		printf("Case %d:",x++)
#define tin2(x,y)		scanf("%d%d",&x,&y)
#define tin3(x,y,z)		scanf("%d%d%d",&x,&y,&z)
#define loop(i,i0,in)	for(int i=i0 ; i<in ; i++)
#define rep(i,n)		for(int i=0 ; i<(n) ; i++)
#define _rep(i,n)		for(int i=n-1 ; i>=0 ; i--)
#define _loop(i,in,i0)	for(int i=in-1 ; i>=i0 ; i--)
#define Fore(it, x)		for(typeof (x.begin()) it = x.begin(); it != x.end (); it++)

LL gcd(LL a,LL 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()  
{  
#ifdef Online_Judge
	freopen("a.in","r",stdin);
#endif
	LL a,b;
	while(cin >> a >> b)
		cout << gcd(a,b) << ' ' << lcm(a,b) << endl;
	return 0;
}

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

using namespace std;

int main(){
	int a, b, c, d,r,s,h;
	while (cin >> a >> b){
		//c
		h = a;
		s = b; {
			r = h % s;
			if (r == 0) {
				c = s;
				break;
			}
			h = s;
			s = r;
		}

		//d
		h = a;
		s = b;
		if (a < b){
			for (;;){
				if ((b % a) == 0){
					d = b;
					break;
				}
				b = b + s;
			}
		}
		else if (a >= b){
			for (;;){
				if ((a % b) == 0){
					d = a;
					break;
				}
				a = a + h;
			}
		}

		cout << c << " " << d << endl;
	}
}

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;}return 0;}

C++: #include<iostream>
#include<cstdio>
using namespace std;
int main(){
   int a,b;
   double A,B;
   double GCD,LCM;
   double z;
   
   while(cin>>A>>B){
      if(A<B){
         z = A;
         A = B;
         B = z;
      }
      a = static_cast<int>(A);
      b = static_cast<int>(B);
   
      while(1){
         if(a%b == 0){
            GCD = static_cast<double>(b);
            break;
         }
         z = a%b;
         a = b;
         b = z;
      }
      LCM = A*B/GCD;
      
      printf("%.0lf %.0lf\n",GCD,LCM);
   }
   return 0;
}

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

C++: #include <cstdio>

int main()
{
    long a, b;
    long m, n, temp;

    while (scanf("%ld %ld", &a, &b) != EOF) {
        if (a < b) {
            temp = a;
            b = a;
            a = temp;
        }
        m = a;
        n = b;

        while (n > 0) {
            temp = n;
            n = m % n;
            m = temp;
        }

        printf("%ld %ld\n", m, a / m * b);
    }

    return 0;
}