Good day Sir/Ma'am,

Just want to ask if you can help me with this one, and please can you provide me a sample code on how to do this in C language:


If an employee input a data like this:
--------------------------------------------------
Enter Time-in: 08:00
Enter Time-out: 17:01
Total No. of Working Hours: 8 hours
--------------------------------------------------

How will i do this in C language using time.h?

Thanks a lot....

For example, this way:

#include <time.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
void main()
{
char stb[1025];
char ste[1025];
char sh[3],sm[3];
tm rtb,rte;
time_t ttb,tte,ttr;
long qh,qm;

printf("Enter Time-in: ");scanf("%s",stb);
printf("Enter Time-out: ");scanf("%s",ste);

rtb.tm_year=111;rtb.tm_mon=0;rtb.tm_mday=1;rtb.tm_sec=0;
strncpy(sh,stb,2);sh[2]='\0';
strncpy(sm,stb+3,2);sm[2]='\0';
rtb.tm_hour=atoi(sh);
rtb.tm_min=atoi(sm);

rte.tm_year=111;rte.tm_mon=0;rte.tm_mday=1;rte.tm_sec=0;
strncpy(sh,ste,2);sh[2]='\0';
strncpy(sm,ste+3,2);sm[2]='\0';
rte.tm_hour=atoi(sh);
rte.tm_min=atoi(sm);

ttb=mktime(&rtb);
tte=mktime(&rte);

ttr=difftime(tte,ttb);
qm=ttr/60;
qh=qm/60;
if(qh)
qm=qm%(qh*60);
printf("Total No. of Working Hours: %02d:%02d\n",qh,qm);
}

Sir thanks for your kind reply and code sample

BUT i receive this error when i run your code, this is the Error:

Undefined symbol 'mktime' in module

hope you could help me with this one...

thanks a lot sir!

Sir skaa7,

thanks a lot for your post, its working now, i already found the problem, i use Turbo C++ 3.0 and now its working....

thanks a lot again sir!

By the way sir, i have a question:
First Question:
---------------------------------------
why did you add +3 on stb?

strncpy(sm,stb+3,2);
---------------------------------------

Second Question:
---------------------------------------
and what is this for?

sm[2]='\0';
---------------------------------------


Thank you very much Sir!

strncpy(sm,stb+3,2); is because of this time format:
HH:MM
, so if we count from 0, MM begins from 3-rd symbol.
sm[2]='\0'; is because functions like atoi(...) work with null-terminated strings.

Sir Skaa7,

Thank you very much for your kind reply! I really appreciated it!

Sir i have another problem, the code is working except in the part of minutes like this:

Enter Time-in: 8:00
Enter Time-out: 17:00
Total No. of Working Hours: 9:00 hours

the above is correct but when I Enter a data like this:

Enter Time-in: 8:15
Enter Time-out: 17:00
Total No. of Working Hours: 7:00 hours

which is I think Wrong... it has to be 8:45 hours (9hrs - 15minutes = 8:45 hours)

Hope you can help me on this one too sir...

Thank you very much again Sir!

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