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
//------------------------------------------
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <queue>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <string>
#include <cstring>
#include <ctime>


using namespace std;

//conversion
//------------------------------------------
inline int toInt(string s) { int v; istringstream sin(s); sin >> v; return v; }
template<class T> inline string toString(T x) { ostringstream sout; sout << x; return sout.str(); }

//math
//-------------------------------------------
template<class T> inline T sqr(T x) { return x*x; }

//typedef
//------------------------------------------
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef long long LL;

//container util
//------------------------------------------
#define ALL(a)  (a).begin(),(a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define PB push_back
#define MP make_pair
#define SZ(a) int((a).size())
#define EACH(i,c) for(typeof((c).begin()) i=(c).begin(); i!=(c).end(); ++i)
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define EXISTch(s,c) ((((s).find_first_of(c)) != std::string::npos)? 1 : 0)//cがあれば1 if(1)
#define SORT(c) sort((c).begin(),(c).end())

//repetition
//------------------------------------------
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define rep(i,n)  FOR(i,0,n)
#define loop(n) FOR(i,0,n)
#define rrep(i,a,b) for(int i=(a);i>=(b);--i)
//constant
//--------------------------------------------
const double EPS = 1e-10;
const double PI = acos(-1.0);
const int INF = (int)1000000007;
const LL MOD = (LL)1000000007;//10^9+7
const LL INF2 = (LL)100000000000000000;//10^18

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(){
   int i,j;
    
   for(i=1;i<10;i++){
      for(j=1;j<10;j++){
        cout << i << "x" << j << "=" << i*j << "\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;

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

C++: #include<stdio.h>
int main(void)
{
	int a,b,c,x;
	for(a=1;a<=9;a++){
		for(b=1;b<=9;b++){
			c=a*b;
		printf("%dx%d=%d\n",a,b,c);
			}
		}
	return 0;
}

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

int main(){
	int index,jndex;
	for(index = 1; index <= 9 ; index++){
		for(jndex = 1 ; jndex <= 9 ; jndex++){
			cout<<index<<"x"<<jndex<<"="<<index*jndex<<endl;
		}
	}
	
}

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

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

C++: main(){__builtin_puts("1x1=1\n1x2=2\n1x3=3\n1x4=4\n1x5=5\n1x6=6\n1x7=7\n1x8=8\n1x9=9\n2x1=2\n2x2=4\n2x3=6\n2x4=8\n2x5=10\n2x6=12\n2x7=14\n2x8=16\n2x9=18\n3x1=3\n3x2=6\n3x3=9\n3x4=12\n3x5=15\n3x6=18\n3x7=21\n3x8=24\n3x9=27\n4x1=4\n4x2=8\n4x3=12\n4x4=16\n4x5=20\n4x6=24\n4x7=28\n4x8=32\n4x9=36\n5x1=5\n5x2=10\n5x3=15\n5x4=20\n5x5=25\n5x6=30\n5x7=35\n5x8=40\n5x9=45\n6x1=6\n6x2=12\n6x3=18\n6x4=24\n6x5=30\n6x6=36\n6x7=42\n6x8=48\n6x9=54\n7x1=7\n7x2=14\n7x3=21\n7x4=28\n7x5=35\n7x6=42\n7x7=49\n7x8=56\n7x9=63\n8x1=8\n8x2=16\n8x3=24\n8x4=32\n8x5=40\n8x6=48\n8x7=56\n8x8=64\n8x9=72\n9x1=9\n9x2=18\n9x3=27\n9x4=36\n9x5=45\n9x6=54\n9x7=63\n9x8=72\n9x9=81");}

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;
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 <stdio.h>

int main(void)
{

C++: #include <stdio.h>

int main(void)
{
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 <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>
using namespace std;

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

	return 0;
}

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

C++: #include<iostream>
using std::cout;
using std::endl;
int main()
{
	for (int x = 1; x <= 9; x++)
	{
		for (int y = 1; y <= 9; y++)
		{
			cout << x <<"x"<< y <<"="<<x*y<<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;
	}
}

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

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

C++: #include<stdio.h>
int a, b;int main(){for(a=1;a<=9;a++)for(b=1;b<=9;b++)printf("%dx%d=%d\n",a,b,a*b);return 0;}

C++: #include <stdio.h>

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>
#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 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()
{
	int i,j;

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

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

using namespace std;

typedef long long ll;


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;
    }
  }

}

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;
		}
	}
}

C++: #include<stdio.h>

int main(){

    return 0;
}

C++: #include<iostream>
using namespace std;
int main(){
int i,j;
for(i=1;i<=9;i++){
for(j=1;j<=9;j++){
cout<<i<<"x"<<j<<"="<<i*j<<endl;
}
}
return 0;
}

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

int main(){
	int k = strtol("4294967297", 0, 10);
	return k == 1;
}