Go: package main
import (
	"os"
	"fmt"
	"strconv"
	"bufio"
	"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++: #include <iostream>

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

int main()
{ 
	int a, b;

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

	return 0;
}

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


 
int main(){
	int in[2],a,b,ans[2],i = 2;
	while(cin >> in[0] >> in[1]){
		a = in[0];
		b = in[1];
		if(a >= b){
			while(a >= 0){
				if(in[0] % a == 0 and in[1] % a == 0){
					ans[0] = a;
					break;
				}
				a--;
			}
		}else if(b >= a){
			while(b >= 0){
				if(in[0] % b == 0 and in[1] % b == 0){
					ans[0] = b;
					break;
				}
				b--;
			}
		}else{
			ans[0] = 1;
		}
		cout << ans[0] << endl;
		a = in[0];
		b = in[1];

		ans[1] = 1;
		while(i <= a or i <= b){
			if(a % i == 0 and b % i == 0){
				a = a / i;
				b = b / i;
				ans[1] = ans[1]*i;
				i = 1;
			}
			i++;
		}
		ans[1] = ans[1]*a*b;
		cout << ans[1] << endl;
		
	}
}

C++: /********************************************************************
 * ??£?????´??° a,b ?????\?????????a ??¨ b ????????§??¬?´???°??¨????°???¬?????°???????????????
 * ????????°?????????????????????????????????
 ********************************************************************/
#include <iostream>
//#include <cstring>
typedef struct _input_values {
    int a;
    int b;
} INPUT_VALUES;

typedef struct _input_values_list {
    INPUT_VALUES sList[10000];
    int effectCount;
} INPUT_VALUES_LIST;

int gcd( int a, int b );    // ?????§??¬?´???°????±???????
int lcm( int a, int b, int g );    // ????°???¬?????°????±???????

using namespace std;

int main()
{
    int i = 0;
    int tA = 0, tB = 0;
    int g = 0, l = 0;
    INPUT_VALUES_LIST values = {0};

    //memset( &values, 0, sizeof(values) );

    while( cin >> tA >> tB ) {
        values.sList[values.effectCount].a = tA;
        values.sList[values.effectCount].b = tB;
        values.effectCount++;
    }

    for ( i = 0; i < values.effectCount; i++ ) {
        g = gcd( values.sList[i].a, values.sList[i].b );
        l = lcm( values.sList[i].a, values.sList[i].b, g );
        cout << g << " " << l << endl;
    }

    return 0;
}

/*  @brief  ?????§??¬?´???°????±???????
 *  @param  [i] a   ???????????????
 *  @param  [i] b   ???????????????
 *  @retval ?????§??¬?´???°
 */
int gcd( int a, int b )
{
    int ret = 0;

    if ( 0 == a || 0 == b ) {
        return 0;
    }

    if ( a != b ) {
        if ( a > b ) {
            a = a - b;
        } else {
            b = b - a;
        }
    } else {
        return a;
    }

    ret = gcd( a, b );

    return ret;
}

/*  @brief  ????°???¬?????°????±???????
 *  @param  [i] ???????????????
 *  @param  [i] ???????????????
 *  @param  [i] ?????§??¬?´???°
 *  @retval ????°???¬?????°
 */
int lcm( int a, int b, int g )
{
    if ( 0 == a || 0 == b ) {
        return 0;
    }

    return ( a * b / g );
}

C++: #include<iostream>
using namespace std;
int GCD(int n,int m){
  if(n<m){
    int t;
    t = m;
    m = n;
    n = t;
  }
  int i;
  while(n%m != 0){
    i = n%m;
    n = m;
    m = i;
  }
  return m;
    
}
int main(){
  int n,m,i=0,a[50],b[50];
  while(cin >> n >> m){
    a[i] = GCD(n,m);
    b[i] = m/GCD(n,m)*n;
    i++;
    n = 0;
    m = 0;
  }
  for(n=0;n<i;n++) cout << a[n] << " " << b[n] << endl;
  return 0;
}

C++: #include<iostream>
#include<algorithm>
#define LL long long

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

int main() {
	LL A, B;
	while (std::cin >> A >> B) {
		if (A < B)std::swap(A, B);
		LL g = gcd(A, B);
		std::cout << g << " " << (A*B) / g << std::endl;
	}
	return 0;
}

C++: #include<iostream>
#include<cmath>
#include<string>
#include<cctype>
#include<vector>
#include<algorithm>
using namespace std;
int main(){
        int a,b,gcda,gcdb,c;
        while(scanf("%d %d",&a,&b)!=EOF){
                if(a<b){
                        swap(a,b);
                }
                gcda=a;
                gcdb=b;
                while(gcda%gcdb){
                        c=gcdb;
                        gcdb=gcda%gcdb;
                        gcda=gcdb;
                }
                printf("%d %d\n",gcdb,(a*b)/gcdb);
        }
        return 0;
}

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

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

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

int main ()
{
    long long x,y;
    while(cin>>x>>y){
    cout<<gcd(x,y)<<' '<<lcm(x,y)<<endl;
    }
    return 0;
}

C++: #include <iostream>

using namespace std;

int gcd(int x,int y);
int lcm(int x,int y);

int main(){
  int a,b;

  cin >> a >> b;

  cout << gcd(a,b) <<" "<<lcm(a,b)<<endl;

  return 0;
}

int gcd(int x,int y){
  int z;
  while(y != 0){
  z = x%y; 
  x = y;
  y = z;
  }
  return x;
}

int lcm(int x,int y){

  return x/gcd(x,y)*y;

}

C++: #include<stdio.h>
int gcd(int x,int y){
    int r,m;
    if(x < y){
        m=x;
        x=y;
        y=m;
    }
    while(y > 0){
        r = x % y;
        x = y;
        y = r;
    }
    return x;
}
int main()
{
    unsigned long long int a,b,x,n;
    while(scanf("%lld%lld",&a,&b)!=EOF){
        x=gcd(a,b);
        printf("%lld ",x);
        n=a/x*b;
        printf("%lld\n",n);
    }
    return 0;
}

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

int main(){
  int a,b,ky,kb,t,k;

  for(int n=0;n<50;n++){
    cin>>a;
    cin>>b;
    t=1;
    for(int i=1;i<2000000000;i++){
      if(a%i==0&&b%i==0){
        a=a/i;
        b=b/i;
        t=i*t;
      }
    }
    k=t*a*b;
    cout<<t<<" "<<k;
  }
  return 0;
}

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

int main(){
	long long a,b,GCD,LCM,x,a2,b2;
	while(cin>>a>>b){
	a2=a;
	b2=b;
	while(a!=b){
		if(a>b){
			x=a-b;
			a=b;
			b=x;
		}
		else if(b>a){
			x=b-a;
			b=a;
			a=x;
		}
	}
	GCD=a;
	LCM=a2*b2/a;

	cout<<GCD<<" "<<LCM<<endl;
	}
	return 0;
}

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

int main() {
	// your code goes here
	int a,b;
	int miner,maxer;
	while(cin >> a >> b){
		int a2=a,b2=b;
		while(max(a2,b2)%min(a2,b2)!=0){
			if(a2>b2)
			a2=a2-b2;
			else
			b2=b2-a2;
		}
		miner =min(a2,b2)
		cout << miner << endl;
		cout << a*b/miner << endl;
	}
	return 0;
}

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

#define times(n, i) uptil(0, n, i)
#define upto(f, t, i) for(auto _##i = (t), i = decltype(_##i)(f) poi i <= _##i poi i++)
#define uptil(f, t, i) for(auto _##i = (t), i = decltype(_##i)(f) poi i < _##i poi i++)
#define downto(f, t, i) for(auto i = (f), _##i = decltype(i)(t) poi i >= _##i poi i--)
#define downtil(f, t, i) for(auto i = (f), _##i = decltype(i)(t) poi i > _##i poi i--)

#define unless(c) if(!(c))
#define until(c) while(!(c))
#define loop while(true)

#define poi ;
#define poipoi << "\n"

using namespace std;

template<class T> T lov_yet(T t){
    if(t) return t poi
    else return 0 poi
}

template<class T> T gcd(T a, T b){
    if(b) return gcd(b, a % b) poi
    else return a poi
}

int main(){
    long long a, b poi
    while(cin >> a >> b)
        cout << gcd(a, b) << " " << a * b / gcd(a, b) poipoi poi
    return 0 poi
}