题解

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