feof

Checks if the end of the given file stream has been reached.

[edit] Parameters

[edit] Return value

nonzero value if the end of the stream has been reached, otherwise ​0​

[edit] Notes

This function only reports the stream state as reported by the most recent I/O operation, it does not examine the associated data source. For example, if the most recent I/O was a fgetc , which returned the last byte of a file, feof returns zero. The next fgetc fails and changes the stream state to end-of-file. Only then feof returns non-zero.

In typical usage, input stream processing stops on any error; feof and ferror are then used to distinguish between different error conditions.

[edit] Example

#include <stdio.h>
#include <stdlib.h>
 
int main(void)
{
 const char* fname = "/tmp/unique_name.txt"; // or tmpnam(NULL);
 int is_ok = EXIT_FAILURE ;
 
 FILE * fp = fopen (fname, "w+");
 if (!fp)
 {
 perror ("File opening failed");
 return is_ok;
 }
 fputs ("Hello, world!\n", fp);
 rewind (fp);
 
 int c; // note: int, not char, required to handle EOF
 while ((c = fgetc (fp)) != EOF ) // standard C I/O file reading loop
 putchar (c);
 
 if (ferror (fp))
 puts ("I/O error when reading");
 else if (feof(fp))
 {
 puts ("End of file is reached successfully");
 is_ok = EXIT_SUCCESS ;
 }
 
 fclose (fp);
 remove (fname);
 return is_ok;
}

Hello, world!
End of file is reached successfully

[edit] References

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