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<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 << endl;
    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 << endl;
        }
    }
    return 0;
}

C++: #include <cstdio>

using namespace std;

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

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 <bits/stdc++.h>

using namespace std;

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);

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

C++: #include<stdio.h>
int main(void)
{
	int i,j;
	
	for(i=0; i<9; i++){
		for(j=0; j<9; j++){
			printf("%dx%d=%d",i,j,i*j);
		}
	}
}