int ferror ( FILE * stream );
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/* ferror example: writing error */
#include <stdio.h>
int main ()
{
FILE * pFile;
pFile=fopen("myfile.txt","r");
if (pFile==NULL) perror ("Error opening file");
else {
fputc ('x',pFile);
if (ferror (pFile))
printf ("Error Writing to myfile.txt\n");
fclose (pFile);
}
return 0;
}Error Writing to myfile.txt