02-13-2018
In addition to what RudiC has already said, you say that you have messed up the loops; but there aren't any loops in your code! There are only nested if statements that seem to try to calculate the number of days in years without accounting for the number of days in months or the number of days between days within a month. You are correct in thinking that you need a couple of nested loops (one looping through months and one looping through years, and depending on how you structure your code, you might also want a loop to loop through days in a month), but your code does not contain any loops at all. Loops start with keywords like for, until, and while; not with the keyword if.
One might note that the prompts given to your users asks for 10 character inputs in the format YYYY-MM-DD, but when you extract the year, month, and day fields from the entered strings, you only look at the first 8 of those 10 characters.
RudiC mentioned that you have a dangling else. I'm not sure it that is true or not. Your lack of consistent indentation makes it impossible to line up ifs with their corresponding elses and fis. But it is clear that you have more fis than you have ifs; and that has to be an error.
Instead of partially checking whether the start date comes before or after the end date so many times, you might want to check that just after you get the two dates from your user and switch their values if the end comes before the start.
Note also that if you have a date like December 31 in one year and January 1 in the next year, there is one day between them whether or not either of those years is a leap year. And, if you go from February 28 to March 1 that is going to be one day or two days depending on what year is being processed. Your code only calculates leap days if the years are different. And, if you go from March 1 in one leap year to February 28 in the next leap year; even though both years are leap years, there are no leap days in the four or eight years between those two dates.
And, finally, you might also note that you use a variable named start, but you never assign any value to it. I haven't verified that there aren't any other variables that are used without being set.
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LEARN ABOUT FREEBSD
calendar
CALENDAR(3) BSD Library Functions Manual CALENDAR(3)
NAME
easterg, easterog, easteroj, gdate, jdate, ndaysg, ndaysj, week, weekday -- Calendar arithmetic for the Christian era
LIBRARY
Calendar Arithmetic Library (libcalendar, -lcalendar)
SYNOPSIS
#include <calendar.h>
struct date *
easterg(int year, struct date *dt);
struct date *
easterog(int year, struct date *dt);
struct date *
easteroj(int year, struct date *dt);
struct date *
gdate(int nd, struct date *dt);
struct date *
jdate(int nd, struct date *dt);
int
ndaysg(struct date *dt);
int
ndaysj(struct date *dt);
int
week(int nd, int *year);
int
weekday(int nd);
DESCRIPTION
These functions provide calendar arithmetic for a large range of years, starting at March 1st, year zero (i.e., 1 B.C.) and ending way beyond
year 100000.
Programs should be linked with -lcalendar.
The functions easterg(), easterog() and easteroj() store the date of Easter Sunday into the structure pointed at by dt and return a pointer
to this structure. The function easterg() assumes Gregorian Calendar (adopted by most western churches after 1582) and the functions
easterog() and easteroj() compute the date of Easter Sunday according to the orthodox rules (Western churches before 1582, Greek and Russian
Orthodox Church until today). The result returned by easterog() is the date in Gregorian Calendar, whereas easteroj() returns the date in
Julian Calendar.
The functions gdate(), jdate(), ndaysg() and ndaysj() provide conversions between the common "year, month, day" notation of a date and the
"number of days" representation, which is better suited for calculations. The days are numbered from March 1st year 1 B.C., starting with
zero, so the number of a day gives the number of days since March 1st, year 1 B.C. The conversions work for nonnegative day numbers only.
The gdate() and jdate() functions store the date corresponding to the day number nd into the structure pointed at by dt and return a pointer
to this structure.
The ndaysg() and ndaysj() functions return the day number of the date pointed at by dt.
The gdate() and ndaysg() functions assume Gregorian Calendar after October 4, 1582 and Julian Calendar before, whereas jdate() and ndaysj()
assume Julian Calendar throughout.
The two calendars differ by the definition of the leap year. The Julian Calendar says every year that is a multiple of four is a leap year.
The Gregorian Calendar excludes years that are multiples of 100 and not multiples of 400. This means the years 1700, 1800, 1900, 2100 are
not leap years and the year 2000 is a leap year. The new rules were inaugurated on October 4, 1582 by deleting ten days following this date.
Most catholic countries adopted the new calendar by the end of the 16th century, whereas others stayed with the Julian Calendar until the
20th century. The United Kingdom and their colonies switched on September 2, 1752. They already had to delete 11 days.
The function week() returns the number of the week which contains the day numbered nd. The argument *year is set with the year that contains
(the greater part of) the week. The weeks are numbered per year starting with week 1, which is the first week in a year that includes more
than three days of the year. Weeks start on Monday. This function is defined for Gregorian Calendar only.
The function weekday() returns the weekday (Mo = 0 .. Su = 6) of the day numbered nd.
The structure date is defined in <calendar.h>. It contains these fields:
int y; /* year (0000 - ????) */
int m; /* month (1 - 12) */
int d; /* day of month (1 - 31) */
The year zero is written as "1 B.C." by historians and "0" by astronomers and in this library.
SEE ALSO
ncal(1), strftime(3)
STANDARDS
The week number conforms to ISO 8601: 1988.
HISTORY
The calendar library first appeared in FreeBSD 3.0.
AUTHORS
This manual page and the library was written by Wolfgang Helbig <helbig@FreeBSD.org>.
BUGS
The library was coded with great care so there are no bugs left.
BSD
November 29, 1997 BSD