Question

C please

In this question, you will find the difference between two time durations. You are given the following struct definitions:

typedef struct _duration {
    int hours;
    int minutes;
} Duration;

Design a function to find the difference between two durations:

Duration* subtract(Duration* duration1, Duration* duration2) {

}

Return a pointer to a new duration struct that contains the difference between the two.

It may be useful to reduce the durations to a single unit (example: minutes), find the difference, and then convert it back to hours and minutes.

Duration 1 will always be longer than duration 2.

Your answer should be in reduced form. For example, a time of "0 hours and 130 minutes" would be incorrect. The expected result, in this case, would be "2 hours and 10 minutes".

You must include the main function in your submission (provided in the template) so the code will compile. Note that only the return value of the subtract function will be tested.

Examples

Example 1 (provided in template)

Given duration1 is a pointer to a duration struct with:

5 hours and 30 minutes

And given duration2 is a pointer to a duration struct with:

1 hours and 55 minutes

If you call Duration* difference = subtract(duration1, duration2)

difference should be a pointer to a struct containing 3 hours and 35 minutes.

Example 2

Given duration1 is a pointer to a duration struct with:

6 hours and 45 minutes

And given duration2 is a pointer to a duration struct with:

2 hours and 15 minutes

If you call Duration* difference = subtract(duration1, duration2)

difference should be a pointer to a struct containing 4 hours and 30 minutes.

TEMPLATE

#include <stdio.h>

#include <stdlib.h>

typedef struct _duration {

int hours;

int minutes;

} Duration;

Duration* subtract(Duration* d1, Duration* d2) {

// CODE HERE

}

// Example main. You only need to write 'subtract', but this is here to help you test.

int main() {

Duration a = {5, 30}; // Struct shorthand for 5 hours, 30 minutes

Duration b = {1, 55}; // Struct shorthand for 1 hour, 55 minutes

Duration* d = subtract(&a, &b);

printf("%d:%d\n", d->hours, d->minutes);

// Expected output:

// 3:35

}

Answer 1

If you have any doubts, please give me comment...

#include <stdio.h>

#include <stdlib.h>

typedef struct _duration {

int hours;

int minutes;

} Duration;

Duration *subtract(Duration *d1, Duration *d2) {

Duration *temp = (Duration *)malloc(sizeof(Duration));

int tot_mins = (d1->hours*60 + d1->minutes) - (d2->hours*60 + d2->minutes);

temp->hours = tot_mins/60;

temp->minutes = tot_mins%60;

return temp;

}

// Example main. You only need to write 'subtract', but this is here to help you

// test.

int main() {

Duration a = {5, 30}; // Struct shorthand for 5 hours, 30 minutes

Duration b = {1, 55}; // Struct shorthand for 1 hour, 55 minutes

Duration *d = subtract(&a, &b);

printf("%d:%d\n", d->hours, d->minutes);

// Expected output:

// 3:35

}