i want make to time table in c with store all teacher data

If this is a homework question, good luck with it....

If on the other hand, this is a task that's required for an actual educational institution - I suggest you further examine your idea of constraints. That is to say, that when timetabling for each trimester/semester the hardest aspect is fitting in with the constraints of the individual students, or as is the more usual collection - student sets.

Where a student-set is defined as the group of students that are undertaking all of their classes together.

I've spent quite some time creating the timetables for a smallish college with some 1500 students. Commercial solutions include Allocate+ and Syllabus+




Though I'm not (usually) a total bastard, and I will give you a hint or two:
It's my advice that you break the week up into blocks of 1 hour or 30 min or 15 min (whichever is the finest granularity you need for scheduling - we used 1 hour)
So, you may have 5 days a week, from 9am to 5pm - This would imply breaking the week up into 8 hrs/day * 5 days = 40 blocks.
You can then give each staff member an array with 40 elements. Each element may be set to NULL if the staff member doesn't have a class, or it could be set to a value that designates the class scheduled during that block of time.

This will allow you to tell who is doing what at any given time. You'll obviously need this information when your code is trying to decide when to schedule each class. It's then up to you to come up with a method to calculate (if possible) a timetable that schedules each of the required classes.

Without serious restrictions on the set of input data, this may be a daunting process. Good luck!