Untitled

#include <iostream>
using namespace std;

int main(){
  int r;
  while(true){
      cout << "Enter number of rows: ";
      cin >> r;
      if(r < 3) cout << "That is too few rows for me to make a right-upper trianglei.\n";
      else if(r > 23) cout << "That is too many rows for me to make a right-upper trianglei.\n";
      else break;
  }
  if(r % 2 == 0) r++;
  for(int i = 1; i < r; i++){
      for(int j = i-1; j >= 1; j--){
       cout << ' ';
    }
    for(int j = r-i; j >= 1; j--){
      cout << '*';
    }
    cout << "\n";
  }
  
}