//File name is PI.cpp
/*This program experiments with use of formatting in chapter 3
 and explores how accurate float and double values are as stored in the computer
  AUTHOR Carol Conway Jan. 31, 2017 */
#include <iostream>
#include <iomanip>
#include <string>
using namespace std;
int main()
{
    const double PI =  3.14159265358979323846;  //actual value accurate to 20 digits
    const float PI2 = 3.141592;                 //actual value accurate to 6 digits
    const long double PI3 = 3.14159265358979323846;
    string PIValue = "3.14159265358979323846";

    cout << left<<setw(50) << "The value of PI accurate to 20 digits is " << right<< setw(22)<< PIValue<< endl;
    cout << left<< setw(50) << "double PI no number of decimal places specified " << right << setw(22) << PI << endl;
    cout << left<< setw(50) << "float PI no number of decimal places specified " << right<< setw(22)<<PI2 << endl;

    cout << "double PI with 20 fixed decimal places " << setprecision(20)<< fixed<<PI<< endl;
    cout << "long double PI with 20 fixed decimal places " << setprecision(20)<< fixed<<PI3<< endl;
    cout << "float PI with 20 fixed decimal places " << setprecision(20)<< fixed<<PI2<< endl;
    cout << "Sizes of long double, double and float are " << sizeof(PI3) << " " <<sizeof(PI)<<" " << sizeof(PI2) << endl;
    return 0;

}