Elapsed Time C Program using struct - c

Question

//import library
#include <stdio.h>
#include <stdlib.h>
//declare variable structure
struct time{
int hour;
int min;
int sec;
}startTime, endTime, different, elapsed;
//mould struct and compute elapsedTime
struct time elapsedTime(struct time start, struct time end){
int secondStart, secondEnd, secondDif;
secondEnd = end.hour * 60 * 60 + end.min * 60 + end.sec;
secondStart = start.hour * 60 * 60 + start.min * 60 + start.sec;
if (secondEnd>secondStart)
secondDif = secondEnd - secondStart;
else
secondDif = secondStart - secondEnd;
different.hour = secondDif / 60 / 60;
different.min = secondDif / 60;
return different;
}
//main function
void main(){
printf("Enter start time (Hour Minute Second) using 24 hours system : ");
scanf("%d %d %d", startTime.hour, startTime.min, startTime.sec);
printf("Enter end time (Hour Minute Second) using 24 hours system : ");
scanf("%d %d %d", endTime.hour, endTime.min, endTime.sec);
elapsed = elapsedTime(startTime, endTime);
}
Can someone help me check and run the code to check whether it is working or not?

Answer 1

You have a mistakes in main function, you should use in scanf int * instead of int so you must add &, you can see below:
//main function
void main(){
printf("Enter start time (Hour Minute Second) using 24 hours system : ");
scanf("%d %d %d", &startTime.hour, &startTime.min, &startTime.sec);
printf("Enter end time (Hour Minute Second) using 24 hours system : ");
scanf("%d %d %d", &endTime.hour, &endTime.min, &endTime.sec);
elapsed = elapsedTime(startTime, endTime);
}

Answer 2

I assume you would want to calculate different.sec so I think the correct calculation of the different time is:
secPerHr = 60 * 60;
secPerMin = 60;
if (secondDif >= secPerHr) {
different.hour = secondDif / secPerHr;
secondDif -= different.hour * secPerHr;
}
if (secondDif >= secPerMin) {
different.min = secondDif / secPerMin;
secondDif -= different.min * secPerMin;
}
different.sec = secondDif;
Also, for testing purposes you would probably want to display the result in your main function.