CODEWITHSUNDEEP
cprintffwrite
user3434272
user3434272

Reputation: 1

fprintf and fwrite (written bytes to fp)

I have question about fprintf and fwrite. How many bytes are written when this code runs (assuming fp has been correctly set up).

int i = 10000;

fprintf(fp,"%d",i);

fwrite(fp,sizeof(int),1,&i);

When I checked then 5 bytes and 9 bytes respectively. Maybe I am wrong. I thought it is 4 bytes since int. Can someone explain please??? Thanks.

Upvotes: 0

Views: 2822

Answers (3)

Iharob Al Asimi
Iharob Al Asimi

Reputation: 53006

fprintf writes the string 10000 (5 bytes) to the file, while fwrite writes binary representation of 10000 (sizeof(int) bytes) to the file.

Upvotes: 2

Adem
Adem

Reputation: 9429

fprintf(fp,"%d",i); writes 5 bytes. it writes 10000 as string, 5 chars

Upvotes: 1

Seema Kadavan
Seema Kadavan

Reputation: 2638

How are you checking the number of bytes written? sizeof(int) depends on platform.

Given below is the function signature for fwrite.

size_t fwrite ( const void * ptr, size_t size, size_t count, FILE * stream );

fwrite writes an array of count elements, each one with a size of size bytes, from the block of memory pointed by ptr to stream. The return value gives the actual number of bytes written. Mostly it is going to be size * count.

Similarly fprintf returns the number of characters written/printed.

Upvotes: 1

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