Go: package main

import "fmt"

func gcd(x, y int64) int64 {
	for y != 0 {
		r := x % y
		x = y
		y = r
	}
	return x
}

func lcm(x, y int64) int64 {
	return x / gcd(x, y) * y
}

func main() {
	for {
		var a, b int64

		fmt.Scanf("%d %d", &a, &b)

		if a == 0 && b == 0 {
			break
		}

		fmt.Printf("%d %d\n", gcd(a, b), lcm(a, b))
	}
}

C++: #include <algorithm>
#include <cmath>
#include <iomanip>
#include <iostream>
#include <list>
#include <numeric>
#include <vector>
using namespace std;

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

int getLcm(int a, int b) {
  bool end = false;
  int multi = 1;
  while (!end) {
    if (a * multi % b == 0) {
      break;
    }
    multi++;
  }
  return a * multi;
}

int main(int argc, char const *argv[]) {
  int ans_gcd, ans_lcm, a, b, tmp;
  while (!(cin >> a >> b).eof()) {
    if (a > b) {
      tmp = a;
      a = b;
      b = tmp;
    }
    ans_gcd = getGcd(a, b);
    ans_lcm = getLcm(a, b);
    std::cout << ans_gcd << " " << ans_lcm << '\n';
  }
  return 0;
}

C++: #include<iostream>

using namespace std;

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

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

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

C++: #include <iostream>
#include <string>
#include <sstream>
#include <vector>
#include <cstring>

//typedef struct
//{
//    int left_val;
//    int right_val;
//};

class GcdAndLcm
{
public:
    GcdAndLcm() : m_gcd(0), m_lcm(0) {}
    void Run();

private:
    void readData();
    void GetData(std::string s, int& v1, int& v2);
    int calcGcd(int m, int n);
    int calcLcm(int m, int n);
    void Show();

private:
    std::vector<std::string> m_data;
    unsigned int m_gcd;
    unsigned int m_lcm;
};

void GcdAndLcm::Run()
{
    int val1 = 0, val2 = 0;

    readData();
    
    for (unsigned int i = 0; i < m_data.size(); ++i) {
        GetData(m_data[i], val1, val2);
        m_gcd = calcGcd(val1, val2);
        m_lcm = calcLcm(val1, val2);
        Show();
    }
}
void GcdAndLcm::readData()
{
    std::string line;

    while (std::getline(std::cin, line)) {
        m_data.push_back(line);
    }
}

void GcdAndLcm::GetData(std::string s, int& v1, int& v2)
{
    size_t pos = s.find(" ");
    char tmp[100] = { 0 };
    std::strncpy(tmp, s.c_str(), pos);
    v1 = std::atoi(tmp);
    std::memset(tmp, 0x00, sizeof(tmp));
    pos++;
    std::strncpy(tmp, s.c_str() + pos, s.size() - pos);
    v2 = std::atoi(tmp);
}
int GcdAndLcm::calcGcd(int m, int n)
{
    if ((0 == m) || (0 == n))
        return 0;

    while (m != n)
    {
        if (m > n) m = m - n;
        else         n = n - m;
    }
    return m;
}//gcd

int GcdAndLcm::calcLcm(int m, int n)
{
    if ((0 == m) || (0 == n))
        return 0;

    return ((m / calcGcd(m, n)) * n); // lcm = m * n / gcd(m,n)
}//lcm

void GcdAndLcm::Show()
{
    std::cout << m_gcd << " " << m_lcm << std::endl;
}

int main()
{
    GcdAndLcm gcdAndLcm;

    gcdAndLcm.Run();
}

C++: #include <bits/stdc++.h>
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define rep(i,n) for (int i=0;i<(int)(n);i++)
#define codefor int test;scanf("%d",&test);while(test--)
#define yn(ans) cout<<(ans?"Yes":"No")<<endl
#define YN(ans) cout<<(ans?"YES":"NO")<<endl
#define umap unordered_map
#define uset unordered_set
using namespace std;
using ll = long long;
//入力系
void scan(int& a){scanf("%d",&a);}
void scan(long long& a){scanf("%lld",&a);}
template<class T> void scan(T& a){cin>>a;}
template<class T> void scan(vector<T>& vec){for(auto&& it:vec)scan(it);}
void in(){}
template <class Head, class... Tail> void in(Head& head, Tail&... tail){scan(head);in(tail...);}
//出力系
void print(int& a){printf("%d",a);}
//void print(long long& a){printf("%lld",a);}
void print(double& a){printf("%.15lf",a);}
template<class T> void print(T& a){cout<<a;}
template<class T> void print(vector<T>& vec){if(vec.empty())return;print(vec[0]);for(auto it=vec.begin();++it!= vec.end();){putchar(' ');print(*it);}}
void out(){putchar('\n');}
template<class T> void out(T& t){print(t);putchar('\n');}
template <class Head, class... Tail> void out(Head& head, Tail&... tail){print(head);putchar(' ');out(tail...);}
//デバッグ系
template<class T> void dprint(T& a){cerr<<a;}
template<class T> void dprint(vector<T>& vec){if(vec.empty())return;cerr<<vec[0];for(auto it=vec.begin();++it!= vec.end();){cerr<<" "<<*it;}}
void debug(){cerr<<endl;}
template<class T> void debug(T& t){dprint(t);cerr<<endl;}
template <class Head, class... Tail> void debug(Head& head, Tail&... tail){dprint(head);cerr<<" ";debug(tail...);}

int main(){
    ll a,b;
    while(scanf("%lld %lld",&a,&b)!=EOF){
        printf("%lld %lld\n",__gcd(a,b),a*b/__gcd(a,b));
    }
}

C++: #include <iostream>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <queue>
#include <vector>
#include <cmath>
#include <stack>
#include <map>
#include <set>
#define pi acos(-1)
#define LL long long
#define INF 0x3f3f3f3f
using namespace std;
typedef pair<int, int> P;
const int maxn = 1e5 + 5;

LL GCD(LL a, LL b)
{
    if (b == 0) return a;
    return GCD(b, a%b);
}
int main(void)
{
//	freopen("C:\\Users\\wave\\Desktop\\NULL.exe\\NULL\\in.txt","r", stdin);
    LL a, b;
    while (cin >> a >> b)
    {
        LL gcd = GCD(a, b);
        a /= gcd;
        b /= gcd;
        LL lcm = a * b * gcd;
        cout << gcd << " " << lcm << endl;
    }

    return 0;
}

C++: #include<stdio.h>

int main(void)
{
	int a,b,c,d,z , *q;
	
	scanf("%d%d",&a,&b);
	c = 1;
	d = 1;
	while(1){
		if( a * c < b * d){
			c++;
		}else if( a * c > b * d){
			d++;
		}else if(a * c == b * d){
				*q = a*c;
			break;
		}
	}
	
	while(a % b != 0){
				z = a % b;
				a = b;
				b = z;
	}
	printf("%d %d",b,*q);
}

C++: #include<iostream>

using namespace std;

//Euclidean algorithm
int gcd(int m, int n)
{
	int t;
	while (m != 0) {
		t = m, m = n % m, n = t;
	}
	return n;
}

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



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

	return 0;
}

C++: #include <iostream>
#include <iomanip>
#include <cstdlib>
#include <ctime>
#include <algorithm>
#include <string>

using namespace std;
int main()
{

int x,y,r,a,b;

cin>>x>>y;
a=x;
b=y;
while(x%y!=0)
{
r=x%y;
x=y;
y=r;
}
cout<<y<<" "<<a*b/y<<endl;
return 0;
}

C++: #pragma warning (disable:4996)
#include<iostream>
#include<algorithm>
#include<string>
#include<cmath>
#include<cstdio>
#include<cstring>
#include<string>
#include<queue>
#include<set>
#include<map>
#include<stack>
#include<cstdlib>
#include<functional>
#define ll long long
using namespace std;
int gcd(int a, int b)//最大公约数
{
	if (b == 0)
		return a;
	return gcd(b, a%b);
}

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

C++: #include <iostream>
using namespace std;
int main(void){
   int x, y, temp;
   if (x < y){
       temp = x;
       x = y;
       y = temp;
   }
   
   while (y != 0){
       temp = y;
        y = x % y;
        x = temp;
   }
   return 0;
}

C++: #include <stdio.h>
using namespace std;

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

int lcm(unsigned long n1, unsigned long n2) {
	return n1 * n2 / gcd(n1, n2);
}

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