fopen
Syntax:
#include <cstdio> FILE *fopen( const char *fname, const char *mode );
The fopen() function opens a file indicated by fname and returns a stream associated with that file. mode is used to determine how the file will be treated (i.e. for input, output, etc).
If there is an error, fopen() returns NULL.
| Mode | Meaning |
|---|---|
| “r” | Open a text file for reading |
| “w” | Create a text file for writing |
| “a” | Append to a text file |
| “rb” | Open a binary file for reading |
| “wb” | Create a binary file for writing |
| “ab” | Append to a binary file |
| “r+“ | Open a text file for read/write |
| “w+“ | Create a text file for read/write |
| “a+“ | Open a text file for read/write |
| “rb+“ | Open a binary file for read/write |
| “wb+“ | Create a binary file for read/write |
| “ab+“ | Open a binary file for read/write |
An example:
int ch; FILE *input = fopen( "stuff", "r" ); ch = getc( input );
Related Topics: fclose, fflush, fgetc, fputc, fread, freopen, fseek, fwrite, getc, getchar, setbuf