Go: package main

import (
	"fmt"
	"strconv"
)

func main() {
	for _, leftValue := range MultiplicationTableNum(9) {
		for _, rightValue := range MultiplicationTableNum(9) {
			strLeftVal, strRightVal, strMulti := strconv.Itoa(leftValue), strconv.Itoa(rightValue), strconv.Itoa(Multiplication(leftValue, rightValue))
			fmt.Println(strLeftVal + "x" + strRightVal + "=" + strMulti)
		}
	}
}

func MultiplicationTableNum(num int) []int {
	multiNum := []int{}
	for i := 1; i <= num; i++ {
		multiNum = append(multiNum, i)
	}
	return multiNum
}

func Multiplication(x, y int) int {
	return x * y
}

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 <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int,int> ii;
typedef vector<int> vi;
typedef vector<ii> vii;

const int  MOD=1000000007;
const int  INF= int(1e9);

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

}

C++: /*
C++ ???????????????????????????????????¬??????
??????AOJ-ITP1??????????????????
*/
#define _USE_MATH_DEFINES

#include <iostream> // ?¨??????\??????
#include <fstream>  // ??????????????\??????
#include <string>   // ???????????¢???
#include <vector>   // ???????????????
#include <cmath>    // ??°??????
#include <iomanip>  // stream???????????¢???
#include <algorithm>// max??¢??°??????

using std::cin;
using std::cout;
using std::endl;
using std::string;
using std::vector;        // ????´???°????????????????????????
using std::fixed;         // ???????????????????¨???????????????????????????????
using std::setprecision;  // ?????°????°???°?????\???????????°????????????????????¨????????\???

int main() {
	int row = 9;	// ???
	int col = 9;	// ???
	for (size_t i = 1; i <= row; i++)
	{
		for (size_t j = 1; j <= col; j++)
		{
			cout << i << "??" << j << "=" << i*j << endl;
		}
	}
	return 0;
}

C++: #include <cstdio>

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

	return 0;
}

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

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

C++: #include<stdio.h>
main(){int i=8;while(i++<89)printf("%dx%d=%d\n",i/9,i%9+1,i/9*(i%9+1));}

C++: #include <stdio>

using namespace std;

int main(void)
{
    for (int i = 0; i <= 9; i++) {
        for ( int j = 0; j <= 9; j++) {
            cout << i << 'x' << j << '=' << i * j << endl;
        }
    }
    return 0;
}

C++: #include <bits/stdc++.h>
#define times(i,a) for(int i=0;i<(int)a;i++)
using namespace std;

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

C++: #include<iostream>

using namespace std;

int main(void){
    int i, j;

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

    return 0;
}

C++: #include <cstdio>

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

	return 0;
}

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

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

    return 0;
}

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

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

C++: #include <stdio.h>

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

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

int main()
{
 for(int i=1; i<10; i++)
  for(int j=1; j<10; j++)
   cout << i << 'x' << j << '=' << i*j << '\n';

 return 0;
}

C++: #include <iostream>using namespace std;int main(){    int a,b;    
for(int i=0;i++;i<9){a++;for(int j=0;j++;j<9){b++;    cout << a<<"x"<<b<<"="<<a*b<< endl;    return 0;}

C++: #include <iostream>
using namespace std;
int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    for (int i = 1; i <= 9; i++)
        for (int j = 1; j <= 9; j++)
            cout << i << "x" << j << "=" << i * j << "\n";
}

C++: #include <iostream>
#include <cstdio>
 
using namespace std;
 
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>
using namespace std;
int i;
int I;
int main(){
     for(i=1;i<=10;i++){
        for(I=1;I<=10;I++){
          cout<<i<<'x'<<I<<'='<<i*I<<'\n';
         }
      }
    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 <iostream>
using namespace std;
#define rep(i , m , n) for(int i=m;i<n;++i)
	
int main(){
	rep(i , 1 , 10){
		rep(j , 1 , 10){
			cout << i << 'x' << j << '=' << i*j << endl;
		}
	}
	return 0; 
}