pattern_18.cpp

#include<bits/stdc++.h>
using namespace std;

int main()
{
    int n;
    cin>>n;

    int i =1;
    while (i<=n)
    {
        int j =1;
       while (j<=n)
       {
        char ch ='A'+j-1;
        cout<<ch<<" ";
        j= j+1;
       }
        cout<<endl;
        i =i+1;
    }
    
}