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Standard C Libraries
clearerr
Description:
Include:
Prototype:
Resets the error indictor for the stream
<stdio.h>
void clearerr(FILE * stream );
Argument:
stream
stream to reset error indicators
Remarks:
The function clears the end-of-file and error indicators for the given
stream (i.e., feof and ferror will return false after the function
clearerr is called).
Example:
/* This program tries to write to a file that is
/* readonly. This causes the error indicator to
/* be set. The function ferror is used to check
/* the error indicator. The function clearerr is
/* used to reset the error indicator so the next
/* time ferror is called it will not report an
/* error.
#include <stdio.h> /* for ferror, clearerr, */
/* printf, fprintf, fopen,*/
/* fclose, FILE, NULL */
int main(void)
{
FILE *myfile;
if ((myfile = fopen("sampclearerr.c", "r")) ==
NULL)
printf("Cannot open file\n");
else
{
fprintf(myfile, "Write this line to the "
"file.\n");
if (ferror(myfile))
printf("Error\n");
else
printf("No error\n");
clearerr(myfile);
if (ferror(myfile))
printf("Still has Error\n");
else
printf("Error indicator reset\n");
fclose(myfile);
}
}
Output:
Error
Error indicator reset
*/
*/
*/
*/
*/
*/
*/
? 2008 Microchip Technology Inc.
DS51456E-page 49
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