87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
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#include "types.h"
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#include <stdio.h>
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bool is_leap_year(int year) {
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return (year % 4 == 0 && year % 100 != 0) ||
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(year % 4 == 0 && year % 400 == 0);
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}
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/**
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* Determine whether the provided date is valid.
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*
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* @param date Datová struktura reprezentující datum
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*
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* @return `true` v případě validního data, `false` jinak
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*/
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bool is_valid_date(struct date_t date) {
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return !(date.day > 31 || date.day < 1 || date.month > 12 || date.month < 1 ||
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(date.month == 2 && date.day > 29 && is_leap_year(date.year)) ||
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(date.month == 2 && date.day > 28 && !is_leap_year(date.year)) ||
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date.year < 1582 || date.year > 2024 ||
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((date.month == 4 || date.month == 6 || date.month == 9 ||
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date.month == 11) &&
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date.day > 30));
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}
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/**
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* Find the earlier date by comparing years, months and days.
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*
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* @param date1 Datová struktura reprezentující první datum
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* @param date2 Datová struktura reprezentující druhé datum
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*
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* @return `DATE1_IS_EARLIER` v případě date1 je dřívější,
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* `DATE1_IS_LATER` když date2 je dřívější,
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* `DATES_ARE_EQUAL` jinak (data jsou stejná)
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*/
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int earlier_date(struct date_t date1, struct date_t date2) {
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// TODO: implementujte funkci dle zadání
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if (date1.year == date2.year && date1.month == date2.month &&
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date1.day == date2.day) {
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return DATES_ARE_EQUAL;
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}
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if (date1.year < date2.year ||
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(date1.year == date2.year && date1.month < date2.month) ||
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(date1.year == date2.year && date1.month == date2.month &&
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date1.day < date2.day)) {
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return DATE1_IS_EARLIER;
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}
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return DATE1_IS_LATER;
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}
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#ifndef TEST_BUILD
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int main(void) {
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struct date_t date1, date2;
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// Load two dates from the user
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printf("Provide the first date (format yyyy-mm-dd): ");
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scanf("%d-%d-%d", &date1.year, &date1.month, &date1.day);
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printf("Provide the second date (format yyyy-mm-dd): ");
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scanf("%d-%d-%d", &date2.year, &date2.month, &date2.day);
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// Check that the dates are valid
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if (!is_valid_date(date1) || !is_valid_date(date2)) {
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printf("Invalid date!\n");
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return 1;
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}
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// Compare the dates and find the earlier one
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int earlier = earlier_date(date1, date2);
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if (earlier == DATE1_IS_EARLIER) {
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printf("The date %d-%d-%d is earlier.\n", date1.year, date1.month,
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date1.day);
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} else if (earlier == DATE1_IS_LATER) {
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printf("The date %d-%d-%d is earlier.\n", date2.year, date2.month,
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date2.day);
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} else {
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printf("The dates are the same.\n");
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}
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return 0;
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}
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#endif
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