In this section, we will learn what the feof() function is and how it works in C.

C feof() Function

When reading the content of a file, we often times want to stop the operation when the end of that file reached.

One of the ways to find out if the end of a file is reached or not is via the call to the `feof()` function.

Note: we need to include the `stdio.h` header file in order to work with this function because the prototype of the function is in this file.

C feof() Function Syntax:

Here’s the prototype of the function:

int feof(FILE *stream)

C feof() Function Parameters

This function takes one argument and that is the address of the memory space allocated to the FILE-structure of the target file.

C feof() Function Return Value

The function returns a non-zero value when the end of the file reached and zero if the file is not at its end.

Example: using feof() function in C

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main() {


    FILE *file = fopen("G:/fileOne.txt","a+");

    if (file == NULL){
        printf("Could not open the file");
        exit(EXIT_FAILURE);

    }

    char c;
    while (1){
        c = getc(file);
        if (feof(file)){
            break;
        }
        printf("%c",c);
    }

    fclose(file);

    printf("\nDone\n");
    return 0;
}

Output:

Hello, my name is John Doe

Done