im new to c++ and having trouble completing this program. Write a program that r

Question

im new to c++ and having trouble completing this program.

Write a program that reads in the size of a triangle and then prints a hollow triangle of that size out of asterisks and blanks. Your program should work for triangles of all sizes between 1 and 20. When the user enters the triangle size, make sure it is a number from 1 to 20. If it is not a valid number, ask the user to re-enter the number. Allow the user to draw as many triangles as they would like before ending the program. Note: due to the character size, the triangle will not actually look like a right triangle.


Example Output:
Enter the triangle size: 25
Size must be between 1 and 20, Enter the triangle size: 5
*
**
* *
* *
*****

Explanation / Answer

Note: Enter wrong triangle size twice to end program.

#include <iostream>
using namespace std;

int main()
{
   //PROTOTYPES
   void printRightHollowTriangle(int length);

   //LOCAL DECLARATIONS
   int length;

   //PROCEDURES
   do
   {
      cout << "Enter the triangle size: ";
      cin >> length;
      cin.ignore();
      if (length <= 20 && length >= 1)
      {
         printRightHollowTriangle(length);
         cout << endl;
      }
      else
      {
         cout << "Size must be between 1 and 20,"
              << " re-enter the triangle size: ";
         cin >> length;
         cin.ignore();
         if (length <= 20 && length >= 1)
         {
            printRightHollowTriangle(length);
            cout << endl;
         }
         else
         {
            cout << "End - Program aborted ";
         }
      }
   }
   while (length <= 20 && length >= 1);

   cin.get();
   return 0;
}

//---------------------------------------------------------
// FUNCTION DEFINITION
//---------------------------------------------------------
void printRightHollowTriangle(int length)
{
   for (int line = 1; line < length; ++line)
   {
      cout << "*";
      for (int blank = 0; blank < line - 2; blank++)
      {
         cout << " ";
      }
      if (line > 1)
      {
         cout << "*";
      }
      cout << endl;
   }
   for (int line = 0; line < length; ++line)
   {
      cout << "*";
   }
   cout << endl;
}

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