110 lines
2.4 KiB
C++
110 lines
2.4 KiB
C++
#include <stdio.h>
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#include <iostream>
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#include <iomanip>
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using namespace std;
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struct Date {
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int day;
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int month;
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int year;
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};
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char * daynames[] = {
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"Sonntag",
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"Montag",
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"Dienstag",
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"Mittwoch",
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"Donnerstag",
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"Freitag",
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"Samstag"
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};
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char * leapYearStr[] = {
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"kein",
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"ein"
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};
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/**
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* Days of year
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*/
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int daysofyear[][12] = {
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{ /* no leap year */
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0,
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1*31,
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1*31 + 1*30 - 2,
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2*31 + 1*30 - 2,
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2*31 + 2*30 - 2,
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3*31 + 2*30 - 2,
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3*31 + 3*30 - 2,
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4*31 + 3*30 - 2,
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4*31 + 4*30 - 2,
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5*31 + 4*30 - 2,
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5*31 + 5*30 - 2,
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6*31 + 5*30 - 2,
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},
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{ /* leap year */
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0,
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1*31,
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1*31 + 1*30 - 1, /* add leap day after march */
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2*31 + 1*30 - 1,
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2*31 + 2*30 - 1,
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3*31 + 2*30 - 1,
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3*31 + 3*30 - 1,
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4*31 + 3*30 - 1,
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4*31 + 4*30 - 1,
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5*31 + 4*30 - 1,
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5*31 + 5*30 - 1,
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6*31 + 5*30 - 1,
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}
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};
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bool isLeapYear(struct Date date) {
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return date.year % 4 == 0 && (date.year % 400 == 0 || date.year % 100 != 0);
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}
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int calcLeapDays(struct Date date) {
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int leapDays = 0;
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int years = date.year - 1; /* only use past years for calc */
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leapDays += years / 4;
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leapDays += years / 400;
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leapDays -= years / 100;
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return leapDays;
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}
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int main(int argc, char **argv) {
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struct Date date;
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/* read date */
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cout << "Bitte gebe ein Datum ein (dd-mm-yyyy): ";
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scanf("%d.%d.%d", &date.day, &date.month, &date.year);
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/* input validation to stay in array boundaries */
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date.day = (date.day-1) % 31 + 1;
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date.month = (date.month-1) % 12 + 1;
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//cout << date.day << "." << date.month << "." << date.year << endl; /* check validation results */
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bool bLeapYear = isLeapYear(date);
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int leapDays = calcLeapDays(date);
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int years = date.year - 1; /* gregorian calendar starts with 1.1.1 */
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int days = 0;
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days += years * 365; /* add years without leap days */
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days += daysofyear[isLeapYear(date)][date.month-1];
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days += date.day;
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days += leapDays;
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/* Output */
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cout << endl << "Berechnungen für den " << setfill('0') << setw(2) << date.day << "." << setw(2) << date.month << "." << setw(4) << date.year << endl;
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cout << "Das Jahr " << setfill('0') << setw(4) << date.year << " ist " << leapYearStr[bLeapYear] << " Schaltjahr." << endl;
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cout << "Anzahl der Schaltjahre:\t\t" << leapDays << endl;
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cout << "Anzahl normaler Jahre:\t\t" << years - leapDays << endl;
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cout << "Anzahl der Tage:\t\t" << days << endl;
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cout << "Wochentag (Modulo):\t\t" << days % 7 << endl;
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cout << "Der Wochentag ist ein " << daynames[days % 7] << "." << endl;
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return 0;
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}
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