segmentation fault when opening file

I'm doing code in c language
I get segmentation fault when i try to open a file that contains 1000 lines similar to this

1,2,1,5,6,7 (I have six integers in every line separated by comma)
What is the maximum limit to read using fopen in c?

 

Some piece of code is required for somebody to help you. You will not satisfy if a person replies "Check the fopen function".

 

I have found the answer.please stop this thread

 

thank you. i figured out the fault. my file pointer was null and i was trying to close it