CODEWITHSUNDEEP
c
danny suen
danny suen

Reputation: 39

I get the Warning: comparison between pointer and integer

I am confused as to why I get this warning[Warning] comparison between pointer and integer

while (fread(&searchrecord, sizeof(record), 1, fl) != NULL)

How I fix it?

Upvotes: 2

Views: 921

Answers (2)

Bathsheba
Bathsheba

Reputation: 234695

fread returns a size_t value which is an unsigned integral type. Your platform is defining NULL as (void*)0 which is a pointer type.

Your compiler issues a warning since you're comparing these unrelated types.

The solution is to drop the != NULL in your condition:

while (fread(&searchrecord,sizeof(record),1,fl))

which is clearer anyway.

Upvotes: 5

chqrlie
chqrlie

Reputation: 144715

fread returns the number of items successfully read from the stream. You should compare that to the actual number you passed:

while (fread(&searchrecord, sizeof(record), 1, fl) == 1)

If you try and read more than one item, you should store the return value and compare that to 0.

Upvotes: 0

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