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++)
			printf("%dx%d=%d\n",i,j,i*j);
    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 <iostream>			//std::cout, std::cin
#include <string>			//std::string,std::to_string(C++11)
#include <vector>			//std::vector
#include <valarray>			//std::valarray
#include <algorithm>		//std::sort
#include <ctime>			//localtime_s
#include <cstdlib>			//abs
#include <cmath>			//abs,std::pow,sqrt,sin,cos,round,floor,ceil
#include <fstream>			//std::ifstream,std::ofstream
#include <iomanip>			//std::setprecision,std::setw,std::setfill
#include <random>			//std::random(C++11)
#include <numeric>			//std::accumulate
#include <functional>		//std::greater
#include <chrono>			//std::chrono(C++11)
#include <bitset>			//std::bitset
#include <queue>			//std::queue

const static double	de_PI	= 3.14159265358979323846;
const static int	de_MOD	= 1000000007;
const static int	de_MAX	= 999999999;

int main(void) {

	//std::ifstream in("123.txt");	std::cin.rdbuf(in.rdbuf());
	//std::ofstream ofs("456.csv");
	//std::chrono::system_clock::time_point t_st = std::chrono::system_clock::now();

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


	//std::chrono::system_clock::time_point t_ed = std::chrono::system_clock::now();
	//std::cout << std::chrono::duration_cast<std::chrono::milliseconds>(t_ed - t_st).count() << "ms" << std::endl;

}

C++: #include<stdio.h>
int a, b;int main(){for(a=1;a<=9;a++)for(b=0;b<9;printf("%dx%d=%d\n",a,++b,a*b));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 <iostream>
#include <string>
#include <vector>
#include <map>
#include <algorithm>
#include <deque>
#include <cctype>
#include <cstdio>
#include <math.h>
#include <set>
using namespace std;
int main(void){
    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 <= 9; i++){
		for(int j = 1; j <= 9; j++){
			cout << i << "x" << j << "=" << i * j << endl;
		}
	}
	return 0;
}

C++: #include <iostream>
int s,e;int main(){while((s+=(e=e%9+1)<2)<10)std::cout<<s<<'x'<<e<<'='<<s*e<<'\n';exit(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++: for i in range(1,10):
    for j in range(1,10):
        print(i,"x", j,"=", i*j)

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

C++: #include<stdio.h>
int main(void){
	int a, b, c;
	for(a=1;a<10;a++);{
	for(b=1;b<10;b++);{
		c = a * b;
		printf("%dx%d=%d\n", a, b, c);
	}
	}
	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()
{
int i;
float s, a;

s = 1
a = 2
for (s = 1; s <= 10; s = s + 1) {
for (a = 2; a <=10; a = a + 1) {
 i=s*a;

printf("i=%d, i=%f\n",i );
}
}}

C++: #include <iostream>
#include <cmath>
#include <cstdio>
#include <algorithm>
#include <vector>
#include <sstream>
#include <string>
#include <cstdlib>
using namespace std;

template <class T> int streamvar(std::istream& in, T& var)
{
    if (!in) {
        return 1;
    }
    in >> var;
    if (in.fail()) {
        return 1;
    }
    return 0;
}
template <class T> int streamvec(std::istream& in, std::vector<T> &v)
{
    v.clear();
    string s;

    if (!in) {
        return 1;
    }
    getline(in, s);
    if (in.fail()) {
        return 1;
    }
    istringstream is(s);
    while (1) {
        T tmp;
        is >> tmp;
        if (is.fail())
            break;
        v.push_back(tmp);
    }
    return 0;
}

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

C++: #include<iostream>
#include<string>
#include<cmath>
#include<vector>
#include<stack>
#include<queue>
#include<algorithm>
#include<complex>
using namespace std ;
typedef vector<int> vi ;
typedef vector<vi> vvi ;
typedef vector<string> vs ;
typedef pair<int, int> pii; 
typedef long long ll ;

#define loop(i,a,b) for(int i = a ; i < b ; i ++)
#define rep(i,a) loop(i,0,a)
#define all(a) (a).begin(),(a).end()

int main(void){
  loop(i,1,10)
    loop(j,1,10)
    cout<< i << "x" << j << "=" << i * j << endl;
}