Strange Things with C

[DBQ]

Hi everybody, could somebody let me know what is wrong please?

I wrote this function to check whether the fopen command opened the file:




void fcheck(FILE* fp, char* name)
{
if(fp == NULL)
{
fprintf("<ERROR MESSAGE>");
exit(1);
}
}



Now if I have a stamement FILE* fp = fopen("noSuchFile","r"), and do if(fp==NULL){.....print error} the NULL is picked up. When I do fcheck(fp,"noSuchFile") the NULL value is not picked up why???

[dwhitney67]

Is the code you posted the "real" code, or something that you typed for your query? You are missing an arg to the fprintf() call; namely a pointer to a FILE (perhaps stdout or stderr?).

As for the function, it should work, presuming of course you performed an fopen() prior to the function call, and passed the file-pointer returned by the fopen() call.

[DBQ]

The code is something I types for the query. I will look at it more and see why this behavior is happening.

[PandaGoat]

When you call fcheck, are you sure you are not actually passing a pointer to the pointer (&fp if fp is defined as FILE* fp)?

As far as I know, with the code you gave, it does what you want, except for misusing fprintf.