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16-Bit Language Tools Libraries
fopen
Description:
Include:
Prototype:
Opens a file.
<stdio.h>
FILE *fopen(const char * filename , const char * mode );
Arguments:
filename
mode
name of the file
type of access permitted
Return Value:
Remarks:
Returns a pointer to the open stream. If the function fails a null pointer
is returned.
Following are the types of file access:
r -
opens an existing text file for reading
w - opens an empty text file for writing. (An existing file will
be overwritten.)
a - opens a text file for appending. (A file is created if it
doesn't exist.)
rb -
opens an existing binary file for reading.
wb - opens an empty binary file for writing. (An existing file
will be overwritten.)
ab - opens a binary file for appending. (A file is created if it
doesn't exist.)
r+ -
opens an existing text file for reading and writing.
w+ - opens an empty text file for reading and writing. (An
existing file will be overwritten.)
a+ - opens a text file for reading and appending. (A file is
created if it doesn't exist.)
r+b or rb+ -
opens an existing binary file for reading and writing.
w+b or wb+ - opens an empty binary file for reading and writing. (An
existing file will be overwritten.)
a+b or ab+ - opens a binary file for reading and appending. (A file is
created if it doesn't exist.)
DS51456E-page 56
Example:
#include <stdio.h> /* for fopen, fclose, */
/* printf, FILE, */
/* NULL, EOF */
int main(void)
{
FILE *myfile1, *myfile2;
int y;
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