Answer to Question #284724 in C++ for papi

Question

FRIDAY THE 13TH

When will Friday the 13th occur in 1990? Write a program that will

find all months in 1990 in which the 13th falls on a Friday.

You need to know the following.

1. January 1, 1990 was on a Monday.

2. September, April, June, and November have thirty days, all the rest

have 31 except for February which has 28 except in leap years when it has 29.

3. 1990 is not a leap year.

Note: To make it fair for everyone, you may not use any built-in date

functions from your computer language.

Sample Run

In 1990, Friday the 13th occurs in the months:

APRIL

Answer 1

Source.cpp
#include <iostream>
#include <iomanip>
#include "Date.h"

using namespace std;

void iterateMonth(int);
bool isFriday13th();
string dayofweek[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "" };
string month[] = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December", "" };
//int dayInMonth[13] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
//int dayInMonthLeap[13] = { 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };


void iterateMonth(int year) {
    int dayCode, month, daysInMonth, day, u;
    bool leapYear;
    cout << year;

    // returns the day on which January 1 of year begins.
    dayCode = Date::getDayCode(year);
    // returns true if year is a leap year, false otherwise
    leapYear = Date::isLeap(year);

    // month is 0 for Jan, 1 for Feb, etc.
    for (month = 1; month <= 12; month++)
    {
        switch (month)
        {
        case 1:
            cout << "\n\nJanuary\n";
            daysInMonth = 31;
            break;
        case 2:
            cout << "\n\nFebruary\n";
            if (leapYear)
                daysInMonth = 29;
            else
                daysInMonth = 28;
            break;
        case 3:
            cout << "\n\nMarch\n";
            daysInMonth = 31;
            break;
        case 4:
            cout << "\n\nApril\n";
            daysInMonth = 30;
            break;
        case 5:
            cout << "\n\nMay\n";
            daysInMonth = 31;
            break;
        case 6:
            cout << "\n\nJune\n";
            daysInMonth = 30;
            break;
        case 7:
            cout << "\n\nJuly\n";
            daysInMonth = 31;
            break;
        case 8:
            cout << "\n\nAugust\n";
            daysInMonth = 31;
            break;
        case 9:
            cout << "\n\nSeptember\n";
            daysInMonth = 30;
            break;
        case 10:
            cout << "\n\nOctober\n";
            daysInMonth = 31;
            break;
        case 11:
            cout << "\n\nNovember\n";
            daysInMonth = 30;
            break;
        case 12:
            cout << "\n\nDecember\n";
            daysInMonth = 31;
            break;
        }
        //cout << "\n\nSun  Mon  Tue  Wed  Thu  Fri  Sat\n";
        for (int i = 0; i < (sizeof(dayofweek) / sizeof(dayofweek[0])); i++)
        {
            cout << dayofweek[i] << "  ";
        }
        cout << endl;
        for (day = 1; day <= dayCode * 5; day++)
        {
            cout << " ";
        }
        for (day = 1; day <= daysInMonth; day++)
        {
            cout << setw(3) << day;
            if ((day + dayCode) % 7 > 0)
            {
                cout << "  ";
            }
            else
                cout << endl;
        }
        dayCode = (dayCode + daysInMonth) % 7;
   }
}
//bool isFriday13th() {
//
//}

int main() {
    int year;

//cout << "Please enter a year: ";}