// Pizza Pi Program
// Calculates how many slices of pizza can be cut from a pizza of given diameter.
 
#include <iostream>
#include <iomanip>
#include <cmath>   // for M_PI (π constant)
using namespace std;
 
int main() {
    const double SLICE_AREA = 14.125; // area of one slice in square inches
    double diameter, radius, pizzaArea, slices;
 
    // Ask user for pizza diameter
    cout << "Enter the diameter of the pizza (in inches): 16";
    cin >> diameter;
 
    // Radius is half of diameter
    radius = diameter / 2.0;
 
    // Calculate pizza area
    pizzaArea = M_PI * pow(radius, 2);
 
    // Calculate number of slices
    slices = pizzaArea / SLICE_AREA;
 
    // Display result
    cout << fixed << setprecision(2);
    cout << "\nA pizza with a diameter of 16" << diameter 
         << " inches can be cut into approximately " 
         << slices << " slices." << endl;
 
    return 0;
}
 

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