C Tutorial/stdio.h/clearerr

clearerr

Item Value Header file stdio.h Declaration void clearerr(FILE *stream); Function Reset (set to zero) the error flag. The end-of-file indicator is also reset.

<source lang="cpp">#include <stdio.h>

 #include <stdlib.h>
 int main(int argc, char *argv[]) {
   FILE *in, *out;
   char ch;
   if((in=fopen("inFile.txt", "rb")) == NULL) {
     printf("Cannot open input file.\n");
     exit(1);
   }
   if((out=fopen("outFile.txt", "wb")) == NULL) {
     printf("Cannot open output file.\n");
     exit(1);
   }
   while(!feof(in)) {
     ch = getc(in);
     if(ferror(in)) {
       printf("Read Error");
       clearerr(in);
       break;
     } else {
       if(!feof(in))
         putc(ch, out);
        
       if(ferror(out)) {
         printf("Write Error");
         clearerr(out);
         break;
       }
     }
   }
   fclose(in);
   fclose(out);
   return 0;
 }</source>