In this example, we will calculate the difference between two time periods using a structure.

## Calculate Difference Between Two Time Periods

```	```
#include<stdio.h>

struct time
{
int hours;
int minutes;
int seconds;
};

int main()
{
/* Creating structure variables */
struct time start, stop, diff;

/* Reading first time period */
printf("Enter hours, minutes and seconds of start time: ");
scanf("%d%d%d", &start.hours,&start.minutes, &start.seconds);

/* Reading second time period */
printf("Enter hours, minutes and seconds of stop time: ");
scanf("%d%d%d", &stop.hours,&stop.minutes, &stop.seconds);

if(start.seconds > stop.seconds)
{
stop.seconds += 60;
--stop.minutes;
}

if(start.minutes > stop.minutes)
{
stop.minutes += 60;
--stop.hours;
}

diff.seconds = stop.seconds - start.seconds;
diff.minutes = stop.minutes - start.minutes;
diff.hours = stop.hours - start.hours;

printf("Difference = %d : %d : %d", diff.hours, diff.minutes, diff.seconds);
return 0;
}
```
```

Output :

```	```
Enter hours, minutes and seconds of start time: 10 11 55
Enter hours, minutes and seconds of stop time: 12 14 55
Difference = 2 : 4 : 0
```
```