How to check if a file size is greater than a determined number? [duplicate]

Question

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I want to use a if statement to check if a file size is greater than a determined number in kb. For example:

if(filesize GTREATER than VARX){
 DO
}else{
 DO
}

I'm new to C yet, so please, can you explain clearly, if I have to use a different function.

Answer 1

If you've already fopen()ed the file, then you can use fstat(). stat() or lstat() can be used on files by name (in a string), but are somewhat less efficient if you do it repeatedly. You'll need to use fileno() to get the file descriptor (int) from the FILE * returned by fopen(). Otherwise, the man pages have reasonable examples.