Answer to Question #253474 in C++ for Commish

Question

c++ program that print out calendar given month year as input

Answer 1

#include <bits/stdc++.h>
using namespace std;


int dayNumber(int day, int month, int year)
{


    int t[] = {0, 3, 2, 5, 0, 3, 5, 1,
                      4, 6, 2, 4};
    year -= month < 3;
    return (year + year / 4 - year / 100 +
            year / 400 + t[month - 1] + day) %
           7;
}


string monthsName(int monthIndex)
{
    string months[] = {"January", "February", "March",
                       "April", "May", "June",
                       "July", "August", "September",
                       "October", "November", "December"};


    return (months[monthIndex]);
}


int dayNumber(int monthIndex, int year)
{
    if (monthIndex == 0)
        return (31);


    if (monthIndex == 1)
    {
        if (year % 400 == 0 ||
            (year % 4 == 0 && year % 100 != 0))
            return (29);
        else
            return (28);
    }


    if (monthIndex == 2)
        return (31);


    if (monthIndex == 3)
        return (30);


    if (monthIndex == 4)
        return (31);


    if (monthIndex == 5)
        return (30);


    if (monthIndex == 6)
        return (31);


    if (monthIndex == 7)
        return (31);


    if (monthIndex == 8)
        return (30);


    if (monthIndex == 9)
        return (31);


    if (monthIndex == 10)
        return (30);


    if (monthIndex == 11)
        return (31);
}


void getCalendar(int year)
{
    printf("         Calendar - %d\n\n", year);
    int days;


    int current = dayNumber(1, 1, year);


    for (int i = 0; i < 12; i++)
    {
        days = dayNumber(i, year);


        printf("\n  ------------%s-------------\n",
               monthsName(i).c_str());


        printf("  Sun  Mon  Tue  Wed  Thu  Fri  Sat\n");


        int k;
        for (k = 0; k < current; k++)
            printf("     ");


        for (int j = 1; j <= days; j++)
        {
            printf("%5d", j);


            if (++k > 6)
            {
                k = 0;
                printf("\n");
            }
        }


        if (k)
            printf("\n");


        current = k;
    }


    return;
}


int main()
{
    int year = 2021;
    getCalendar(year);


    return (0);
}