Null pointer assignment

Hi
I wrote a c program where my input is a file and i store output also in a file. Everything works fine. But in my command prompt it shows null pointer assignment. but my output is not affected. i know about null pointer assignment. but how to detect which part of my pgm is accessing that oth address which causes this error

Quote:

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Originally Posted by Raghavan

Hi
Everything works fine. But in my command prompt it shows null pointer assignment.

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It is not possible for both of these things to be true at the same time. I'm guessing, since you're posting here, that you mean the second one.

Quote:

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Originally Posted by Raghavan

how to detect which part of my pgm is accessing that oth address which causes this error

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With a debugger, if you have one. Judicious use of printf statements. Carefully examining your code for memory accesses.

My Hat of Guessing thinks you are fclose'ing a file twice, but would not be willing to bet any amount of money at any odds that that is actually right.