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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/../cpp/../cpp/../c/io/feof.html below:

feof - cppreference.com

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

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

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.

#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;
}

Possible output:

Hello, world!
End of file is reached successfully

• C11 standard (ISO/IEC 9899:2011):

• 7.21.10.2 The feof function (p: 339)

• C99 standard (ISO/IEC 9899:1999):

• 7.19.10.2 The feof function (p: 305)

• C89/C90 standard (ISO/IEC 9899:1990):

• 4.9.10.2 The feof function

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