5.15

/* 5.15 Triangle-Printing Program
   Deitel & Deitel C++ How to Program, 10th ed (Indian subcontinent adaptation)
   Visual Studio Community 2019 */

#include <iostream>
#include <iomanip>
using namespace std;

int main() {
   int x, row;

   // (a.)
   for (row = 1; row <= 10; row++) {
      for (x = 1; x <= row; x++) cout << '*';
      cout << endl;
   }
   cout << endl << endl;

   // (b.)
   for (row = 0; row < 10; row++) {
      for (x = 1; x <= 10 - row; x++) cout << '*';
      cout << endl;
   }
   cout << endl << endl;

   // (c.)
   for (row = 1; row <= 10; row++) {
      for (x = 1; x <= 10; x++) {
         //deal with spaces
         if (x < row) cout << ' ';
         else cout << '*';
      }
      cout << endl;
   }
   cout << endl << endl;

   // (d.)
   for (row = 1; row <= 10; row++) {
      for (x = 0; x < 10; x++) {
         //spaces
         if (x < 10 - row) cout << ' ';
         else cout << '*';
      }
      cout << endl;
   }
   cout << endl << endl;

   return 0;
}