function

feof

<cstdio>
int feof ( FILE * stream );
Check end-of-file indicator
Checks whether the end-of-File indicator associated with stream is set, returning a value different from zero if it is.

This indicator is generally set by a previous operation on the stream that attempted to read at or past the end-of-file.

Notice that stream's internal position indicator may point to the end-of-file for the next operation, but still, the end-of-file indicator may not be set until an operation attempts to read at that point.

This indicator is cleared by a call to clearerr, rewind, fseek, fsetpos or freopen. Although if the position indicator is not repositioned by such a call, the next i/o operation is likely to set the indicator again.

Parameters

stream
Pointer to a FILE object that identifies the stream.

Return Value

A non-zero value is returned in the case that the end-of-file indicator associated with the stream is set.
Otherwise, zero is returned.

Example

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/* feof example: byte counter */
#include <stdio.h>
int main ()
{
  FILE * pFile;
  long n = 0;
  pFile = fopen ("myfile.txt","rb");
  if (pFile==NULL) perror ("Error opening file");
  else
  {
    while (!feof(pFile)) {
      fgetc (pFile);
      n++;
      }
    fclose (pFile);
    printf ("Total number of bytes: %d\n", n-1);
  }
  return 0;
}


This code opens the file called myfile.txt, and counts the number of characters that it contains by reading all of them one by one. Finally, the total amount of bytes is printed out.

See also

clearerr
Clear error indicators (function )
ferror
Check error indicator (function )

C++