Go: // 九九を出すだけ
package main
import (
	"fmt"
	"os"
	"bufio"
)
var out = bufio.NewWriter(os.Stdout)

func main(){
	defer out.Flush()
	for i:=1; i<10; i++{
		for j:=1; j<10; j++{
			fmt.Fprintf(out, "%dx%d=%d\n", i, j, i*j)
		}
	}
}

C++: #include <bits/stdc++.h>
#include <fstream>
using namespace std;
 
#define rep(i,n) for(int i=0;i<n;i++)
#define REP(i,s,n) for(int i=(s);i<(n);i++)
#define repr(i,n) for(int i=n-1;i>=0;i--)
#define REPR(i,s,n) for(int i=(s);i>=(n);i--)
#define all(a) (a).begin(),(a).end()
#define rall(a) (a).rbegin(),(a).rend()
#define Eunique(v) v.erase(unique(all(v)),v.end())
#define pvec(v) rep(i,v.size()){cout << v[i] << " ";};cout<<endl;
#define pb push_back
#define pf push_front
#define mod 1e9+7
#define m_p make_pair
 
typedef vector<int> vi;
typedef vector<string> vs;
typedef long long ll;
typedef vector<ll> vll;
typedef pair<int,int> pii;
typedef vector<pii> vpii;
typedef pair<ll,ll> pll;
typedef vector<pll> vpll;
typedef vector<vector<int>> vvi;
const double pi = acos(-1.0);
 
ll gcd(ll x, ll y) { return (y == 0) ? x : gcd(y, x % y); }
ll lcm(ll x, ll y) { return x * y / gcd(x, y); }

bool IsPrime(int num)
{
    if (num < 2) return false;
    else if (num == 2) return true;
    else if (num % 2 == 0) return false;

    double sqrtNum = sqrt(num);
    for (int i = 3; i <= sqrtNum; i += 2)
    {
        if (num % i == 0)
        {
            return false;
        }
    }
    return true;
}

int main()
{
    for(int i=1;i<=9;i++){
        for(int j=1;j<=9;j++) printf("%dx%d=%d\n",i,j,i*j);
    }
    return 0;
}

C++: #include<iostream>

int main(){
  for(int i=1; i<=9; i++){
    for(int j=1; j<=9; j++){
      std::cout << i << "x" << j << "=" << i*j << std::endl
    }
  }
  
  return 0;
}

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

int main() {
    
    for (int i = 1; i <= 9; i++) {
        for (int j = 1; j <= 9; j++) {
            std::cout << i << "x" << j << "=" << i*j << std::endl;
        }
    }
    
    return 0;
}

C++: #include  <cstdio>
int main(){
  for(int i=1;i<=9;i++)
    for(int j=1;j<=9;j++)
      printf("%dx%d=%d\n",i,j,i*j);
}

C++: #include <iostream>
using namespace std;
int main(void){
    int x,y,z;
    for(x = 1; x < 10; x++){
        for(y = 1; y < 10; y++){
            z = x*y;
            std::cout << x << "x"<< y << "=" <<z<< std::endl;
        }
    }
}

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

int main()
{
	int i,j;
	
	for(i=1;i<10;i++){
		for(j=1;j<10;j++){
			cout<<i<<"x"<<j<<"="<<i*j<<endl;
		}
	}
	return 0;
}

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

int main(){
	for(int i=1;i<=9;i++){
		for(int j=1;j<=9;j++){
			cout << i << "x" << j << "=" << i*j << endl;
		}
	}

	return 0;
}

C++: #include<stdio.h>

int main()
{
	int i, j;
	for(i=1;i<=9;i++)
		for ( j = 1; j < 10; j++)
		{
			printf("%d??%d=%d\n", i, j, i*j);
		}
	return 0;
}

C++: #include<string>
#include<algorithm>
#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
//	int a;
for(int i=1;i<10;i++)
{
for(int k=1;k<10;k++)
{cout<<i<<"x"<<k<<"="<<i*k<<endl;}
}
	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
#define FOR(i, s, n) for(int i = s; i < (int)n; i++)
#define per(i, n) for(int i = n; i >= 0; i--)
#define ROF(i, s, n) for(int i = s; i >= (int)n; i--)
#define FORIT(i, A) for (auto i : A)
#define PRINT(x) cout << (x) << "\n"
#define ALL(a) (a).begin(),(a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define MP make_pair
#define EACH(i, n) for (__typeof((n).begin()) i = (n).begin(); i != (n).end(); ++i)
#define SZ(a) int((a).size())
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define SORT(c) sort((c).begin(),(c).end())
#define CLR(a) memset((a), 0 ,sizeof(a))
#define NCLR(a) memset((a), -1 ,sizeof(a))
#define dump(x) cout << #x << " = " << (x) << "\n";
#define debug(x) cout << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << "\n";
#define sq(n) (n) * (n)
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef long long LL;
typedef vector<LL> VLL;
typedef vector<VLL> VVLL;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef priority_queue<int> maxpq;
typedef priority_queue< int, vector<int>, greater<int> > minpq;
typedef complex<double> P;
static const double EPS = 1e-10;
static const double PI = acos( -1.0 );
static const int mod = 1000000007;
static const int INF = 1 << 29;
static const LL LL_INF = 1152921504606846976;
static const int dx[] = { -1, 0, 1, 0, 1, -1, 1, -1 };
static const int dy[] = { 0, -1, 0, 1, 1, 1, -1, -1 };


int main() {
#ifdef _DEBUG
	printf( "debug\n" );
#endif
	for ( int i = 1; i < 10; i++ ) {
		for ( int j = 1; j < 10; j++ ) {
			printf( "%dx%d=%d\n", i, j, i * j );
		}
	}
	return 0;
}

C++: #include<cstdio>

int main(){
	for(int i = 1; i <= 9 ; i++){
		for(int j = 1; j<= 9; j++){
			printf("%dx%d=%d\n", i, j, i * j);
		}
	}
	return 0;
}

C++: int main(void){
	int i,j;
	for(i=j=1;i<=9||(i=(j++));i++,j<=9||exit(0))printf("%dx%d=%d\n",j,i,i*j);
	return 0;
}