Go: package main

import "fmt"

func main() {
	var gcdArr, lcmArr [100]int
	var count int
	for {
		var x, y int
		fmt.Scanf("%d %d", &x, &y)
		if x == 0 {
			break
		}
		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
		}
		gcdArr[count] = y
		lcmArr[count] = lcm / y
		count++
	}
	for i := 0; i < count; i++ {
		fmt.Printf("%d %d\n", gcdArr[i], lcmArr[i])
	}
}

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

int main()
{
	int a,b,c,num1,num2,GCD,LCM;

	while(cin >> a >> b){

	//????????????
	if(b < a){
		num1 = a;
		a = b;
		b = num1;
	}
	num1 = a; num2 = b;
	//????????????????????????????????????????????§??¬?´???°????±???????
	while((b%a)!=0){
		c = b%a;
		b = a;
		a = c;
	}
	
	GCD = a;
	
	//????°???¬?????°????±???????
	
	LCM = (num1 / GCD) * num2;
	
	//???????????¨?????????
	cout << GCD << " " << LCM << endl;
	
	}
	
	return 0;
}

C++: #include<stdio.h>

#define MAX(x,y) ((x>y)?x:y)
#define MIN(x,y) ((x<y)?x:y)

int prime[30000];	//soinsuu_分解用に素数を求めておく.
int count;
int soinsuu_A[30000],soinsuu_B[30000];	//soinsuu_を入れる。

int GetPrime(int num);	//num以下の素数をprime[i]に保存
void DevPrime(int *p,int num);	//numをsoinsuu_分解。soinsuu_prime[i]の数を*(p+i)に保存。
int GetLCM(int *pa,int *pb);
int GetGCD(int *pa,int *pb);

int pwd(int tei,int sisuu){
	int ans = 1;
	for(int i = 0;i < sisuu;i++)
		ans *= tei;
	return ans;
}

int main(){
	count = GetPrime(50000); 

	int a,b;
	int LCM[200],GCD[200],cor = 0;
	while(~scanf("%d%d",&a,&b)){
		DevPrime(soinsuu_A,a);
		DevPrime(soinsuu_B,b);
		LCM[cor] = GetLCM(soinsuu_A,soinsuu_B);
		GCD[cor] = GetGCD(soinsuu_A,soinsuu_B);
		cor++;
	}
	for(int i = 0;i < cor;i++)
		printf("%d %d\n",GCD[i],LCM[i]);
	return 0;
}

int GetPrime(int num){
	int count = 0,i,j;
	for(i = 2;i <= num;i++){
		for(j = 0;j < count;j++){
			if(i%prime[j] == 0)                                                                                                                                                                                                                                               
				break;
		}
		if(j < count)
			continue;
		prime[count] = i;
		count++;
	}
	return count;
}
void DevPrime(int *p,int num){
	int i;
	for(i = 0;i < count;i++){
		//保存したい配列を初期化
		p[i] = 0;
		//割りきれなくなるまでその素数で割る。
		while(num%prime[i]==0){
			num /= prime[i];
			p[i]++;
		}
	}
}
int GetLCM(int *pa,int *pb){
	int ans = 1;
	for(int i = 0;i < count;i++){
		ans *= pwd(prime[i],MAX(pa[i],pb[i]));
	}
	return ans;
}
int GetGCD(int *pa,int *pb){
	int ans = 1;
	for(int i = 0;i < count;i++){
		ans *= pwd(prime[i],MIN(pa[i],pb[i]));
	}
	return ans;
}

C++: #include <iostream>
using namespace std;
int GCDr(int x,int y,int n,int d) {
	if (x % n == 0 && y % n == 0) {
		return n;
	}
	else {
		return d;
	}
}
int main() {
	int a, b;
	while (cin >> a >> b){
		int i, GCD, LCM;
		GCD = 0;
		if (a == b) {
			GCD = a;
			LCM = a;
		}
		else {
			if (a > b) {
				swap(a, b);
			}
			for (i = 1; i <= a || i <= b / 2; i++) {
				GCD = GCDr(a, b, i, GCD);
			}
			GCDr(a, b, i, GCD);
			LCM = a * b / GCD;
		}
		cout << GCD << " " << LCM << endl;
	}
}

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

int main(){
  long a, b;
  long l, m, n;
  while (1){
    cin >> a >> b;
    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 <stdio.h>
using namespace std;

int gcd(unsigned long long int num1,unsigned long long int num2) {
	if (num2 == 0) {
		return num1;
	}return gcd(num2, num1 % num2);
}

int lcm(unsigned long long int num1,unsigned long long int num2) {
	return num1 / gcd(num1, num2) * num2;
}

int main() {
	unsigned long long int a, b;
	while (~scanf("%d %d",&a,&b)) {
		if (b > a) {
			unsigned long long int tmp = b;
			b = a;
			a = tmp;
		}
		printf("%d %d\n", gcd(a, b),(unsigned long long int)lcm(a,b));
	}
}

C++: #include<iostream>
using namespace std;
int main(){
bool aaa;
int as,c;
float asd;
int a,b,gcd,lcm;
while(cin>>a>>b){
c=1;
gcd=1;
aaa=true;
while(aaa){
c++;
as=a/c;
asd=a/c;
if(as==asd){
as=b/c;
asd=b/c;
if(as==asd){
gcd*=c;
a/=c;
b/=c;
}
}
if(a==1||b==1){aaa=false;}
}
lcm=a/gcd*b;
cout<<gcd<<" "<<lcm<<endl;
}
}

C++: #include <stdio.h>

int main(void){
    
    int a, b, r, s;
    int temp = 0;
    
    scanf("%d %d", &a, &b);
    s = a * b;
    if(a < b){
        temp = a;
        a = b;
        b = temp;
    }
    
    r = a % b;
    while(r != 0){
        a = b;
        b = r;
        r = a % b;
    }
    
    printf("%d %d\n", b, s/b);
    
    return 0;
}

C++: #include<iostream>
#include<algorithm>
#include<cstdio>
using namespace std;
int main(){
	long long a,b,s,m,ta,tb,tmp;
	while(cin>>a>>b){
	ta=a,tb=b;
	s=0,m=0;
	if(a<b)swap(a,b);
	
	else 
	while(true){
		if(a==0||b==0)cout<<"a#";
		tmp=a;
		a=b;
		b=tmp%a;
		if(a%b==0){
			m=b;
			break;
		}
		if(a<b){
		//cout<<a<<" "<<b<<endl;
		m=1;
		break;
		}
		s=(ta*tb)/m;
		cout<<m<<" "<<s<<endl;
	}
}

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

C++: #include<iostream>
using namespace std;
int main(){
int a,b,x,y,L,i=0;
for(i=0;i<=50;++i){
  cin>>a>>b;
x=a;y=b;
while(x!=y){
  if(x<y){y=y-x;}
  else if(x>y){x=x-y;}
}
L=(a*b)/x;
cout<<y<<" "<<L<<endl;
}
  return 0;
}

C++: #include <iostream>
#include <boost/math/common_factor_rt.hpp>
using namespace std;

int main() {
	int a, b;
	while (cin >> a >> b) {
		int Ngcd = boost::math::gcd(a, b);
		int Nlcm = boost::math::lcm(a, b);
		cout << Ngcd << " " << Nlcm << endl;
	}
	return 0;
}

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

int main() {
	int a,b,c;
	while(cin>>a>>b){
		int g=0,l=0;
		if(a<b){
			c=b;
			b=a;
			a=c;
		}
		while(1){
			int i=1;
			if((i*a)%b==0){
				g=i*a;
			}
			if(g==i*a) break;
			i=i+1;
		}
		while(1){
			int i=2;
			if(a%i==0){
				if(b%(a/i)==0){
					l=a/i;
				}
			}
			i=i+1;
			if(l!=0) break;
		}
		cout<<g<<l<<endl;
	}
	return 0;
}

C++: #include <cstdio>

using namespace std;

#define max( x, y ) ( ( x > y ) ? x : y )
#define min( x, y ) ( ( x < y ) ? x : y )

int main()
{
	char buf[1024];
	int a, b;

	while ( fgets( buf, sizeof( buf ) - 1, stdin ) != NULL && buf[0] != '\n' )
	{
		sscanf( buf, "%d %d", &a, &b );

		for ( int i = min( a, b ); 1 < i; i-- )
		{
			if ( !( a % i ) && !( b % i ) )
			{
				printf("%d ", i );
				break;
			}
		}

		for ( int i = max( a, b ); i <= 2000000000; i++ )
		{
			if ( !( i % a ) && !( i % b ) )
			{
				printf("%d\n", i );
				break;
			}
		}
	}

	return 0;
}

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

int main()
{
	for (unsigned long a, b, x, r; cin >> a >> b; cout << x << ' ' << a << endl) {
		unsigned long at = a, bt = b;
		do {
			r = a%b;
			a = b;
			b = r;
		} while (r);
		x = at*bt / a;
	}
	return 0;
}

C++: #include <iostream>
#include <cstdio>
#include <string>
#include <sstream>
#include <algorithm>
#include <math.h>
#include <map>
#include <iomanip>
#include <vector>
#include <queue>

#define PI 3.14159265359

#define INF 1000000;

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

typedef long long ll;

using namespace std;


/*
class ElectronicPetEasy
{
public:
	string isDifficult(int st1, int p1, int t1, int st2, int p2, int t2)
	{
		
	}
};
*/


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


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