fwrite() not working to write integer in binary file

Question

Can someone tell my why won\'t this function work? I just can\'t get it...

void writeRegister(FILE *arq, Book *L){ //writes in actual file position
  char          


        

Answer 1

The first parameter of fwrite expects a pointer.

Lines such as the following:

fwrite(L->PAGES, sizeof(int), 1, arq);

Should be written as follows:

fwrite(&(L->PAGES), sizeof(int), 1, arq);

Sames goes for YEAR and PRICE members of that struct

fwrite(&(L->YEAR), sizeof(int), 1, arq);
...
fwrite(&(L->PRICE), sizeof(float), 1, arq);

Note, you don't need to make the same change for TITLE, PUBLISHER, and AUTHOR because the type of those member fields are already pointers (char*).