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extra-task-1.cpp
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#include <cfloat>
#include <cassert>
#include <cmath>
double seconds_difference(double time_1, double time_2)
{
return time_2 - time_1;
/*
Return the number of seconds later that a time in seconds
time_2 is than a time in seconds time_1.
>>> seconds_difference(1800.0, 3600.0)
1800.0
>>> seconds_difference(3600.0, 1800.0)
-1800.0
>>> seconds_difference(1800.0, 2160.0)
360.0
>>> seconds_difference(1800.0, 1800.0)
0.0
*/
}
double hours_difference(double time_1, double time_2)
{
return (time_2 - time_1) / 3600.0;
/*
Return the number of hours later that a time in seconds
time_2 is than a time in seconds time_1.
>>> hours_difference(1800.0, 3600.0)
0.5
>>> hours_difference(3600.0, 1800.0)
-0.5
>>> hours_difference(1800.0, 2160.0)
0.1
>>> hours_difference(1800.0, 1800.0)
0.0
*/
}
double to_float_hours(int hours, int minutes, int seconds)
{
assert(minutes < 60 and minutes >= 0);
assert(seconds < 60 and seconds >= 0);
return hours + minutes / 60.0 + seconds / 3600.0;
/*
Return the total number of hours in the specified number
of hours, minutes, and seconds.
Precondition: 0 <= minutes < 60 and 0 <= seconds < 60
>>> to_float_hours(0, 15, 0)
0.25
>>> to_float_hours(2, 45, 9)
2.7525
>>> to_float_hours(1, 0, 36)
1.01
*/
}
double to_24_hour_clock(double hours)
{
return _CMATH_::fmod(_CMATH_::fmod(hours, 24), 12);
}
int get_hours(int sec)
{
return sec / 3600;
}
int get_minutes(int sec)
{
return sec % 3600 / 60;
}
int get_seconds(int sec)
{
return sec % 3600 % 60;
}
/*
Implement three functions
* get_hours
* get_minutes
* get_seconds
They are used to determine the hours part, minutes part and seconds part
of a time in seconds. E.g.:
>>> get_hours(3800)
1
>>> get_minutes(3800)
3
>>> get_seconds(3800)
20
In other words, if 3800 seconds have elapsed since midnight,
it is currently 01:03:20 (hh:mm:ss).
*/
double time_to_utc(int utc_offset, double time)
{
return _CMATH_::fmod((24 + time - utc_offset), 24);
/*
Return time at UTC+0, where utc_offset is the number of hours away from
UTC+0.
You may be interested in:
https://en.wikipedia.org/wiki/Coordinated_Universal_Time
>>> time_to_utc(+0, 12.0)
12.0
>>> time_to_utc(+1, 12.0)
11.0
>>> time_to_utc(-1, 12.0)
13.0
>>> time_to_utc(-11, 18.0)
5.0
>>> time_to_utc(-1, 0.0)
1.0
>>> time_to_utc(-1, 23.0)
0.0
*/
}
double time_from_utc(int utc_offset, double time)
{
return _CMATH_::fmod((24 + time + utc_offset), 24);
/*
Return UTC time in time zone utc_offset.
>>> time_from_utc(+0, 12.0)
12.0
>>> time_from_utc(+1, 12.0)
13.0
>>> time_from_utc(-1, 12.0)
11.0
>>> time_from_utc(+6, 6.0)
12.0
>>> time_from_utc(-7, 6.0)
23.0
>>> time_from_utc(-1, 0.0)
23.0
>>> time_from_utc(-1, 23.0)
22.0
>>> time_from_utc(+1, 23.0)
0.0
*/
}
//òåñòû
int main()
{
//1
assert(_CMATH_::fabs(seconds_difference(1800.0, 3600.0) - 1800.0) < DBL_EPSILON);
assert(_CMATH_::fabs(seconds_difference(3600.0, 1800.0) - -1800.0) < DBL_EPSILON);
assert(_CMATH_::fabs(seconds_difference(1800.0, 2160.0) - 360.0) < DBL_EPSILON);
assert(_CMATH_::fabs(seconds_difference(1800.0, 1800.0) - 0.0) < DBL_EPSILON);
//2
assert(_CMATH_::fabs(hours_difference(1800.0, 3600.0) - 0.5) < DBL_EPSILON);
assert(_CMATH_::fabs(hours_difference(3600.0, 1800.0) - -0.5) < DBL_EPSILON);
assert(_CMATH_::fabs(hours_difference(1800.0, 2160.0) - 0.1) < DBL_EPSILON);
assert(_CMATH_::fabs(hours_difference(1800.0, 1800.0) - 0.0) < DBL_EPSILON);
//3
assert(_CMATH_::fabs(to_float_hours(0, 15, 0) - 0.25) < DBL_EPSILON);
assert(_CMATH_::fabs(to_float_hours(2, 45, 9) - 2.7525) < DBL_EPSILON);
assert(_CMATH_::fabs(to_float_hours(1, 0, 36) - 1.01) < DBL_EPSILON);
//4
assert(_CMATH_::fabs(to_24_hour_clock(24) - 0.0) < DBL_EPSILON);
assert(_CMATH_::fabs(to_24_hour_clock(48) - 0.0) < DBL_EPSILON);
assert(_CMATH_::fabs(to_24_hour_clock(25) - 1.0) < DBL_EPSILON);
assert(_CMATH_::fabs(to_24_hour_clock(28.5) - 4.5) < DBL_EPSILON);
//5
assert(get_hours(3800) == 1);
assert(get_minutes(3800) == 3);
assert(get_seconds(3800) == 20);
//6
assert(_CMATH_::fabs(time_to_utc(+0, 12.0) - 12.0) < DBL_EPSILON);
assert(_CMATH_::fabs(time_to_utc(+1, 12.0) - 11.0) < DBL_EPSILON);
assert(_CMATH_::fabs(time_to_utc(-1, 12.0) - 13.0) < DBL_EPSILON);
assert(_CMATH_::fabs(time_to_utc(-11, 18.0) - 5.0) < DBL_EPSILON);
assert(_CMATH_::fabs(time_to_utc(-1, 0.0) - 1.0) < DBL_EPSILON);
assert(_CMATH_::fabs(time_to_utc(-1, 23.0) - 0.0) < DBL_EPSILON);
//7
assert(_CMATH_::fabs(time_from_utc(+0, 12.0) - 12.0) < DBL_EPSILON);
assert(_CMATH_::fabs(time_from_utc(+1, 12.0) - 13.0) < DBL_EPSILON);
assert(_CMATH_::fabs(time_from_utc(-1, 12.0) - 11.0) < DBL_EPSILON);
assert(_CMATH_::fabs(time_from_utc(+6, 6.0) - 12.0) < DBL_EPSILON);
assert(_CMATH_::fabs(time_from_utc(-7, 6.0) - 23.0) < DBL_EPSILON);
assert(_CMATH_::fabs(time_from_utc(-1, 0.0) - 23.0) < DBL_EPSILON);
assert(_CMATH_::fabs(time_from_utc(-1, 23.0) - 22.0) < DBL_EPSILON);
assert(_CMATH_::fabs(time_from_utc(+1, 23.0) - 0.0) < DBL_EPSILON);
}