// The old 30 days program using a while loop.
// You are offered a job working in the heat from sunup to sundown for 30 days.
// Your salary starts at $0.01 per day and will double each day.
// Would you take the job? Run this program and see if the job is worth it.

#include <iostream>
#include <iomanip>
#include <string>

using std::streamsize;
using std::setprecision;

int main()
{
    double salary = .01; // daily salary
    double total = 0.0; // total of the current days salary and previous days
    const int width1 = 3; // used to format the day column
    const int width2 = 15; // used to format the salary and total columns
    streamsize prec = std::cout.precision(); // used to reset the output

    // print the column headers
    std::cout << std::endl;
    std::cout << std::setw(width1) << "Day"
              << std::setw(width2) << "Salary"
              << std::setw(width2) << "Total" << std::endl;

    // for each day, add the daily salary to the running total, print
    // the results, and then double the salary for the next day.
    int day = 1;
    while (day <= 30) {
        total += salary; // get the daily total

        // print the day, daily salary, and running total
        std::cout << std::setw(width1) << day << setprecision(12)
                  << std::setw(width2) << salary
                  << std::setw(width2) << total
                  << setprecision(prec) << std::endl;

        salary *=2; // double the salary
        ++day; // increment the day; in this case it can be ++day or day++
    }

    return 0;
}