Go: package main

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

func getInputAsInt(in string) (int, int) {
	inArr := strings.Split(in, " ")
	// Atoi(s string) (i int, err error) のerrは捨てる
	val1, _ := strconv.Atoi(inArr[0])
	val2, _ := strconv.Atoi(inArr[1])
	return val1, val2
}

func euclidean(val1, val2 int) (int) {
	surp := 1
	for  {
		surp = val1 % val2
		if surp != 0 {
			val1 = val2
			val2 = surp
		} else {
			break
		}
	}
	return val2
}

func calcLCM(val1, val2, gcd int) (int) {
	return val1/gcd*val2
}

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	
	for scanner.Scan() {
		val1, val2 := getInputAsInt(scanner.Text())
		gcd := euclidean(val1, val2)
		lcm := calcLCM(val1, val2, gcd)
		fmt.Println(gcd, lcm)
	}
}

C++: #include<cstdio>
#include<algorithm>
using namespace std;
typedef unsigned long long ull;
/*ull gcd(ull m,ull n)
{
    ull t;
    ull a=max(n,m),b=min(n,m);
    while(1)
    {
        t=b;
        if(a%b==0) return b;
        b=a%b;
        a=t;
    }
}*/
ull gcd(ull a,ull b)
{
    if(b==0) return a;
    else return gcd(b,a%b);
}
int main()
{
    ull a,b;
    while(~scanf("%I64d%I64d",&a,&b))
    {
        ull t=gcd(a,b);
        printf("%I64d %I64d\n",t,a*b/t);
    }
    return 0;
}

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

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

int LCM(int x,int y)
{
  int i;
  for(i=1;i<=y;i++)
    {
      if((x*i)%y == 0)
	return x*i;
    }
  return x*y;
}



int main(void)
{
  int a,b,k;
  while(scanf("%d %d",&a,&b) != EOF)
    {
      if(a<b){
	 k = b;
	b = a;
	a = k;
      }
      printf("%d %d\n",GCD(a,b),LCM(a,b));
    }
}

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

inline int euclid_alg(const int a, const int b) {
	return a > b ? a % b : b % a;
}

int main(void) {
	int a,b;
	std::vector<int> num;
	while(std::cin >> a >> b){
		num.push_back(a);
		num.push_back(b);
	}
	
	for(int i = 0; i < num.size(); i+=2){
		int pro = num[i] * num[i+1];
		while(num[i] == 0 || num[i+1] == 0){
			if(a > b){
				num[i] = euclid_alg(num[i],num[i+1]);
			}else{
				num[i+1] = euclid_alg(num[i],num[i+1]);
			}
		}
		if(num[i] == 0){
			num[i] = num[i+1];
			num[i+1] = 0;
		}
		num[i+1] = pro / num[i];
	}

	for(int j = 0; j < num.size(); j+=2){
		std::cout << num[j] << " " << num[j+1] << std::endl; 
	}

	return 0;
}

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

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

long lcm(long a, long b){
    return (a * b / gcd(a, b));
}

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

C++: #include "iostream"
using namespace std;
long long GCM(long long a, long long b)	
{
	long long t;
	while (b)
	{
		t = a%b;
		a = b;
		b = t;
	}
	return a;
}
long long LCM(long long a, long long b, long long x)
{
	long long  t;
	t = (a*b) / x;
	return t;
}
int main()
{
	long long a, b;
	while (1)
	{
		if (cin.eof())
			break;
		else
		{
			cin >> a >> b;
			long long m, n;
			m = GCM(a, b);
			n = LCM(a, b, m);
			cout << m << " " << n << endl;
		}
	}
}

C++: #include <iostream>
#include <math.h>
using namespace std;
#define ep 0.00001

int main()
{
	int a, b, temp;
	int a1, b1;
	int gcd, lcm;
	
	while (cin >> a >> b) {
		if (a > b) {
			temp = a;
			a = b;
			b = temp;
		}
		for (int i = b; i >= 1; i--) {
			if ((a % i == 0) && (b % i == 0)) {
				gcd = i;
				break;
			}
		}
		a1 = a;
		b1 = b;
		while (a1 != b1) {
			if (a1 < b1)
				a1 += a;
			else if (a1 > b1)
				b1 += b;
		}
		lcm = a1;
		cout << gcd << " " << lcm << "\n";
	}
	return 0;
}

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

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

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

C++: #include <iostream>
#include <cstring>
#include <cstdio>
#include <algorithm>
#include <vector>
#include <queue>
#include <map>
using namespace std;

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

int main()
{
    long long m,n;
    while(cin>>m>>n);
        cout<<gcd(m,n)<<" "<<lcm(m,n)<<endl;
    return 0;
}

C++: #include <iostream>
using namespace std;
int gcd(int a,int b){
    if(a%b)return gcd(b,a%b);
    else return b;
}
int main(){
    int a,b;
    while(cin>>a>>b){
        cout << gcd(a,b) << " " << a/gcd(a,b)*b << endl;
    }
}

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

int main(){
int i = 0;int a = 0;int b = 0;int aa = 0;int bb = 0;
while(!cin.eof()){
cin >> a >> b;
if(a >= b){
aa = b;bb = a;
}
else{
aa = a;bb = b;
}
while(aa != 0){
int c = 0;
bb = bb % aa;
c = aa;
aa = bb;
bb = c;
}
int P = a * b;
cout << bb << " " << P / bb << endl;

}
    return 0;
}

C++: #include <cstdio>

using namespace std;

#define max( a, b ) ( ( a > b ) ? a : b )
#define min( a, b ) ( ( a < b ) ? a : b )

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 = 1; i * max( a, b ) <= 2000000000; i++ )
		{
			if ( !( a * i % b ) )
			{
				printf("%d\n", a * i );
				break;
			}
		}
	}

	return 0;
}

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

int GCD(int, int);
int LCM(int ,int);

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

int GCD(int a, int b) {
  int c;
  do {
    if (a > b) {
      c = a %= b;
    } else {
      c = b %= a;
    }
  } while (c != 0);
  return a != 0 ? a : b;
}

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

int main(){
  long long a,b,c,l;
  while(cin>>a>>b){
    l = a*b;
    while(b){
      c = a;
      a = b;
      b = c % b;
    }
    cout<<a<<" "<<l/a<<endl;
  }
}

C++: #include <cstdio>
int a,b;
int gcd(int a,int b){return b?gcd(b,a%b):a;}
int main(){
    while(~scanf("%d%d",&a,&b)){printf("%d %lld\n",gcd(a,b),1LL*a*b/gcd(a,b));}
    return 0;
}

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

int main(){

	long long a = 0, b = 0;

	while (cin >> a >> b){
		long long gcd = 0;
		long long lcm = 0;
		long long r = 0;
		long long temp_a = 0, temp_b = 0;
		temp_a = a;
		temp_b = b;
		while ((max(temp_a, temp_b) % min(temp_a, temp_b)) != 0){
			r = (max(temp_a, temp_b) % min(temp_a, temp_b));
			temp_a = temp_b;
			temp_b = r;
		}
		gcd = min(temp_a, temp_b);
		lcm = (a / gcd) * b;
		cout << gcd << " "<< lcm << endl;

	}

	//getchar();

	return 0;
}

C++: #include <cstdio>

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

int main(){
	long long int a,b;
	while(scanf("%lld%lld",&a,&b)!=EOF){
	    long long int c=gcd(a,b);
	    long long int d=a*b/c;
	    printf("%lld %lld\n",c,d);
	}
	return 0;
}

C++: 
#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <cmath>
#include <stack>
#include <cctype>
#include <complex>
#include <vector>
#include <algorithm>

using namespace std;


bool solve(){
	int a,b;
	while(cin>>a>>b){
		int lcm, gcd;
		
		int n=min(a,b);
		for(int i=n/2; i>=1; i--){
			if(!(a%i) && !(b%i)){
				gcd = i;
				break;
			}
		}
		lcm = a * (b / gcd);		//()必要。intの範囲のため
		
		cout<< gcd<< " "<< lcm<< endl;
	}

	return true;
}

int main(){
	cout.setf(ios::fixed);
	cout.precision(10);
	solve();

	return 0;
}