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() {
		a, b := nextInts()
		x, y := gcd(a, b), lcm(a, b)
		fmt.Fprintf(out, "%d %d\n", x, 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
}

func gcd(x, y int) int {
	if x < y {
		gcd(y, x)
	}
	for 0 < y {
		r := x % y
		x, y = y, r
	}
	return x
}

func lcm(x, y int) int {
	return (x * y) / gcd(x, y)
}

C++: /*
 * hujx.cpp
 *
 *  Created on: 2015年5月21日
 *      Author: dell
 */
#include<stdio.h>
#include<iostream>
#include<string>
#include<string.h>
#include<algorithm>
#include<iomanip>
#include<vector>
#include<time.h>
#include<queue>
#include<stack>
#include<iterator>
#include<math.h>
#include<stdlib.h>
#include<limits.h>
#include<map>
#include<set>
#include<bitset>
//#define ONLINE_JUDGE
#define eps 1e-5
#define INF 0x7fffffff
#define FOR(i,a) for((i)=0;i<(a);(i)++)
#define MEM(a) (memset((a),0,sizeof(a)))
#define sfs(a) scanf("%s",a)
#define sf(a) scanf("%d",&a)
#define sfI(a) scanf("%I64d",&a)
#define pf(a) printf("%d\n",a)
#define pfI(a) printf("%I64d\n",a)
#define pfs(a) printf("%s\n",a)
#define sfd(a,b) scanf("%d%d",&a,&b)
#define sft(a,b,num) scanf("%d%d%d",&a,&b,&num)
#define for1(i,a,b) for(int i=(a);i<b;i++)
#define for2(i,a,b) for(int i=(a);i<=b;i++)
#define for3(i,a,b)for(int i=(b);i>=a;i--)
#define MEM1(a) memset(a,0,sizeof(a))
#define MEM2(a) memset(a,-1,sizeof(a))
#define ll long long
const double PI=acos(-1.0);
template<class T> T gcd(T a,T b){return b?gcd(b,a%b):a;}
template<class T> T lcm(T a,T b){return a/gcd(a,b)*b;}
template<class T> inline T Min(T a,T b){return a<b?a:b;}
template<class T> inline T Max(T a,T b){return a>b?a:b;}
using namespace std;
//#pragma comment(linker,"/STACK:1024000000,1024000000")
int n,m,c;
#define N 210
#define M 100010
#define Mod 1000000000
#define p(x,y) make_pair(x,y)
const int MAX_len=550;
int main(){
    ll a,b;
    while(scanf("%lld%lld",&a,&b)!=EOF){
    	ll GCD = gcd(a,b);
    	ll LCM = a/GCD*b;
    	printf("%lld %lld\n",GCD,LCM);
    }
    return 0;
}

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

int gcd(int a, int b) {
  	int q,r;
	while(r!=0){
	q=a/b;
	r=a%b;
	a=b;
	b=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;
#define TYPE int

TYPE gcd(TYPE a,TYPE b){
  if( !b ) return a;
  return gcd(b, a%b);
}
int main(){
  TYPE a,b;
  while(cin>>a>>b){
    TYPE g = gcd(a,b);
    TYPE l = a/g*b;
    cout << g << " " << l << endl;
  }
}

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

using namespace std;

int main()
{
	int  a, b, a1, b1, c, g;
	long l;
	cin >> a >> b;
	a1 = a;
	b1 = b;
	while (cin>>a>>b)
	{
		if (a == 0 || b == 0)
		{
			break;
		}


		while (1)
		{
			c = abs(a - b);
			if (c == 0)
			{
				break;
			}

			if (a > b)
			{
				a = c;
				g = c;
			}
			else if (a < b)
			{
				b = c;
				g = c;
			}
		}
		l = (a1 / g)*b1;
		cout << g << " " << l << endl;
		
		a1 = a; b1 = b;
	}
}

C++: #include<iostream>
int e(int a,int b){
	if(a<b)a^=b^=a^=b;
	return (a%=b)?e(b,a):b;
}
int f(int a,int b,int c,int d){
	if(a<b)a^=b^=a^=b;
	for(;a>b;)b+=d;
	return a-b?f(b,a,d,c):a;
}
int main(){
	for(int a,b,s;s=!(std::cin>>a>>b).eof();s&&printf("%d %d\n",e(a,b),f(a,b,a,b)))
		;
}

C++: #include<cstdio>
#include<iostream>
class GCDandLCM{
    public:
        void solve(int a,int b){
            int big=a,small=b;
            if(a<b){ 
                big=b;
                small=a;
                int tmp=a;
                a=b;
                b=tmp;
            }
            while(big%small!=0){ 
                int tmp=big%small;
                big=small;
                small=tmp;
            }
            printf("%d %d\n",small,(a*b)/small);
        }
};
int main(){ 
    GCDandLCM inst;
    int a,b;
    while(scanf("%d%d",&a,&b)){ 
        inst.solve(a,b);
    }
}

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

int A[60],B[60];

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

int main(){
	int N;
	for(int i=1;i<=50;i++){
		cin>>A[i]>>B[i];
		if(cin.eof()){
			N=i-1;
			break;
		}
	}
	int res[2];
	for(int i=1;i<=N;i++){
		res[0]=gcd(A[i],B[i]);
		res[1]=A[i]/res[0]*B[i];
		cout<<res[0]<<" "<<res[1]<<endl;
	}
	return 0;
}

C++: #include<iostream>
#include<vector>
using namespace std;
int main(){
  int a,b,c,max=0,min=0,bet,les,ch1=0,ch2=0;
  vector<int> ayaku;
  vector<int> byaku;
  while(cin>>a>>b){
    bet=a%b;
    if(bet!=0)
      les=b%bet;
    if(bet==0)
      max=b;
    else if(les==0)
      max=bet;
    else{
      for(;;){
	ch1=bet%les;
	if(ch1==0){
	  max=les;
	  break;
	}
	bet=les;
	les=ch1;
      }
    }
    min=(a/max)*b;
    cout<<max<<" "<<min<<endl;
  }
  return 0;
}

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

C++: #include <cstdio>

using namespace std;

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

int main()
{
  long long a, b;
  while (scanf(" %lld %lld ", &a, &b) == 2) {
    printf("%lld %lld\n", gcd(a, b), a * b / gcd(a, b));
  }
}

C++: #include<cstdio>
int g(int x,int y){return y?g(y,x%y):x;}
int main(){
int x,y;
while(~scanf("%d%d",&x,&y))printf("%d %d\n",g(x,y),x*y/g(x,y));
}

C++: #include<iostream>

using namespace std;

long yakusuu(long a,long b){
	int t;
	if(a>=b) t=a;
	if(a<b) t=b;
	
	for(long i=t ;i>=1 ;i--){

			if(a%i==0 && b%i==0){
				return i;
				break;
			}
	}
}

long baisuu(long a,long b){

	for(long i=1;i<=a*b ;i++){
		if(i%a==0 && i%b==0){
			return i;
			break;
		}
	}
}


int main(){


	long a,b;
	long R,L;

	cin >> a >> b;

	R=yakusuu(a,b);
	L=baisuu(a,b);

	cout << R << " " << L <<endl;

	return 0;

}

C++: #include <cstdio>
#include <queue>
#include <algorithm>
#include <vector>

using namespace std;

long long GCD(long long x, long long y){
	if(x < y) swap(x, y);
	long long r = x % y;
	while(r != 0){
		x = y;
		y = r;
		r = x % y;
	}
	
	return y;
}

int main(){
	long long a, b;
	while(scanf("%lld%lld", &a, &b) == 2){
		long long gcd = GCD(a, b);
		long long lcm = a / gcd * b;
		printf("%lld %lld\n", gcd, lcm);
	}
}

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

long long gcd(long long a, long long b){
    long long x,r;
    if(a < b){
      x = a;
      a = b;
      b = x;
      }
    for(x = 0; b != 0; x++){
      r = a%b;
      a = b;
      b = r;
    }
    return a;
}
int main(void){
    long long a, b;

    while(cin >> a >> b){
    long long lcm = a*b/gcd(a,b);
    cout << gcd(a,b) << " " << lcm << endl;
}

    return 0;
}

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

int gcd(int a, int b) {

	for (int i = a; i >= 1; i--)
		if(a % i == 0)
			if(b % i == 0)
				return i;



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;
}