int getc (strean)
int getchar ()
int fgetc (stream)
int getw (stream)
getchar is identical to getc(stdin).
fgetc behaves like getc, but is a genuine function, not a macro; it may therefore be used as an argument. fgetc runs more slowly than getc, but takes less space per invocation.
getw returns the next word from the named input stream. It returns the constant EOF upon end of file or error, but since that is a valid integer value, feof and ferror(3P) should be used to check the success of getw. getw assumes no special alignment in the file.
A stop with message "Reading bad file" means that an attempt has been made to read from a stream that has not been opened for reading by fopen.