Object Oriented Programming with C++, Second Edition

14.11 IN THE DAYS OF C

Since C++ is the superset of C, facilities present in C language can be used directly in C++ programs. Many times we have to maintain code written few years ago. Hence, it will be in order to have a brief introduction to file handling in C language.

C uses structure named FILE to hold information regarding a file. It has defined structure “FILE” with following definition.

typedef struct   { short     level;     unsigned   flags;     char       fd;     unsigned char hold;     short      bsize;     unsigned char *buffer, *curp;     unsigned   istemp;     short      token;   } FILE;

To open a file function fopen() has to be used. It has the following syntax:

FILE *fopen(const char *filename, const char *mode);

Mode string ...