题解

#include<cstdio>
#include<iostream>
#include<cmath>
using namespace std;
int main(){
  int a,b=1;
  cin >>a ;
  if(a!=0){
  	
  	for(int k =1; k<= a;k++){
  	for(int i = 1; i <=a; i++){
  	cout << b << "x"<< i << "=";
  	printf("%2d", b*i);
  	cout <<" ";
  }

  	cout <<endl;
	  b++;
  }
  	
  }else {
  	cout << "Error";
  }
  
  
    return 0;
}