size_t fwrite(const void *buf, size_t size, size_t count, FILE *fp)
- prototype in stdio.h
- writes (count * size) bytes to file stream "fp"
- swapping parameters "size" and "count" can often provide more
exact feedback (exactly how many bytes were written)
- returns number of data blocks actually written or a short count
- see fopen() fread() setvbuf()