Write a program that prints an oval using the character \'*\'. The user will ent

Question

Write a program that prints an oval using the character '*'. The user will enter the

number of '*'s on the middle row and then the number of rows above and below the middle

row. For instance, an oval with 16 '*"s in the middle row and 2 rows above and below looks

like:

************

**************

****************

**************

************

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

int main()
{
// Declare and initialize variables
int middle_row;
int rows;

// Repeatedly prompt for middle row size until valid value is entered
cout << "Enter size of the middle row: ";
cin >> middle_row;
while (middle_row < 3)
    {
      cout << "Size of the middle row must be at least three." << endl;
      cout << "Enter size of the middle row again: ";
      cin >> middle_row;
    }

// Repeatedly prompt for the number of rows until valid value is entered
cout << "Enter number of rows: ";
cin >> rows;
while (rows < 0 || (middle_row-2*rows) < 2)
    {
      cout << "Invalid number of rows." << endl;
      cout << "Enter number of rows again: ";
      cin >> rows;
    }
cout << endl;

// Print the oval

return 0;

}

Explanation / Answer

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

int main()
{
// Declare and initialize variables
int middle_row;
int rows;

// Repeatedly prompt for middle row size until valid value is entered
cout << "Enter size of the middle row: ";
cin >> middle_row;
while (middle_row < 3)
{
cout << "Size of the middle row must be at least three." << endl;
cout << "Enter size of the middle row again: ";
cin >> middle_row;
}

// Repeatedly prompt for the number of rows until valid value is entered
cout << "Enter number of rows: ";
cin >> rows;
while (rows < 0 || (middle_row-2*rows) < 2)
{
cout << "Invalid number of rows." << endl;
cout << "Enter number of rows again: ";
cin >> rows;
}
cout << endl;

// Print the oval
  
for(int i = -rows ; i <= rows ; i++){
int diff = ( i > 0 ? i : -i);
for(int j = 0 ; j < diff; j++ ) cout << " " ;
for(int j = diff; j < middle_row; j++) cout << "*";
}

return 0;

}

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