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"
#include <gmp.h>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> veci;
typedef vector<ll> vecll;
typedef vector<string> vecs;
template<class T,class U> using Hash=unordered_map<T,U>;

#define REP(i, a, n) for(ll i = a; i < (ll)n; i++)
#define RREP(i, a, n) for(ll i = n-1; i >= (ll)a; i--)
#define rep(i, n) REP(i, 0, n)
#define rrep(i, n) RREP(i, 0, n)
#define MD 1000000007

template<class T> T read(){T a;cin >> a;return a;}
template<class T> void read(T& a){cin >> a;}
template<class T, class ...Args> void read(T& a, Args&... args){cin >> a; read(args...);} 
template<class T> void rarr(T a, int n){for(int i = 0; i < n; i++) {cin >> a[i];}}
template<char c = ' ',class T> void write(T a){cout << setprecision(12) << a << endl;}
template<char c = ' ',class T,class ...Args> void write(T a, Args... args){cout << setprecision(12) << a << c; write<c>(args...);}
template<class T> void warr(vector<T> a, const char* c = " "){cout << a[0];for(int i = 1; i < (int)a.size(); i++)cout << c << a[i];cout << endl;;}
template<class T> void warr(T a, int n, const char* c = " "){cout << a[0];for(int i = 1; i < n; i++)cout << c << a[i];cout << endl;}
void split(string s, string delim, veci& result){result.clear();string::size_type pos = 0;while(pos != string::npos){string::size_type p = s.find(delim, pos);if(p == string::npos){result.push_back(atoi(s.substr(pos).data()));break;}else {result.push_back(atoi(s.substr(pos, p - pos).data()));}pos = p + delim.size();}}
void split(string s, string delim, vecs& result){result.clear();string::size_type pos = 0;while(pos != string::npos){string::size_type p = s.find(delim, pos);if(p == string::npos){result.push_back(s.substr(pos));break;}else {result.push_back(s.substr(pos, p - pos));}pos = p + delim.size();}}
ll gcd(ll a, ll b){while(true){ll k = a % b;if(k == 0)return b;a = b;b = k;}}
ll comb(ll n, ll m){ll p=1;m=min(m,n-m);for(ll i=1;i<=m;i++){p*=n-i+1;p/=i;}return p;}

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

C++: #include <iostream>

using namespace std;

int main(int argc, char **argv) {
    for (int i = 1; i <= 9; i++) {
        for (int j = 1; j <= 9;j ++) {
            cout << i << 'x' << j << '=' << i * j << endl;
        }
    }

    return 0;
}

C++: main(){for(int i=0,j,k;j=i/9+1,k=i%9+1,81-i;i++)printf("%dx%d=%d\n",j,k,j*k);}

C++: #include <stdio.h>
int main()
{
    int i, j;
    return 0;
}

C++: #include<stdio.h>

int main()
{

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

    //printf("\n");

    }
return 0;

}

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

C++: #include<stdio.h>

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

C++: #include<stdio.h>
main(){int i,j=1;while(j<=9){for(i=1;i<10;i++){printf("%dx%d=%d\n",j,i,i*j);}j++;}

C++: #include <cstdio>

int main()
{
	for (unsigned int i = 1; i <= 9; i++)
	{
		for (unsigned int j = 1; j <= 9; j++)
		{
			std::printf("%ux%u=%u\n", i, j, i * j);
		}
	}
	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<<"*"<<j<<"="<<i*j<<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()
{
        int a,b,c;
        a=b=1;
        for(b=1;b<10;b++)
        {
                for(a=1;a<10;a++)
                {
                c=a*b;
                printf("%dx%d=%d\n",b,a,c);
                }
        }




        return 0;
}

C++: #include<iostream>
using namespace std ;
int main()
{
	int a,
	for ( a = 1 ; a < 10 ; a++ )
		for ( b = 1 ; b < 10 ; b++ )
			cout << a << 'x' << b << '=' << a * b << endl ;
	return 0 ;
}

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

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(){

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

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

void outerLoop(int i);
void innerLoop(int i, int j);

static const int MAX = 9;

int main()
{
    outerLoop(1);
}

void outerLoop(int i)
{
    if (MAX < i) {
        return;
    }
    innerLoop(i, 1);
    outerLoop(i + 1);
}

void innerLoop(int i, int j)
{
    if (MAX < j) {
        return;
    }
    cout << i << "x" << j << "=" << i * j << endl;;
    innerLoop(i, j + 1);
}

C++: #include <iostream>
int main(){
	int a,b,c;
		for(a=1;a<10;++a){
			for(b=1;b<10;++b){
				c=a*b;
				std::cout<<a<<"x"<<b<<"="<<c<<std::endl;
				}
		}
	 return 0;
	}

C++: int main(){
	int a,b;
	for(a=1;a<=9;a++){
		for(b=1;b<=9;b++)
		std::cout<< a << "x" << b << "=" << a*b <<std::endl;
	}
	return 0;
	}