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Showing content from https://www.tutorialspoint.com/c_standard_library/c_function_feof.htm below:

C Library - feof() function

The C library int feof(FILE *stream) function tests the end-of-file indicator for the given stream.This function is part of the standard input/output library (stdio.h) and is important for managing file reading operations in a controlled manner.

Following is the C library syntax of the feof() function −

int feof(FILE *stream);

This function accepts only a single parameter −

• FILE *stream: This is a pointer to a FILE object that identifies the stream to be checked.

The feof function returns a non-zero value if the end-of-file indicator associated with the stream is set. Otherwise, it returns zero.

This program reads characters from example file and prints them until feof indicates the end of the file.

Below is the illustration of C library feof() function.

#include <stdio.h>

int main() {
   FILE *file = fopen("example1.txt", "r");
   if (file == NULL) {
       perror("Failed to open file");
       return 1;
   }

   while (!feof(file)) {
       char c = fgetc(file);
       if (feof(file)) break;
       putchar(c);
   }

   fclose(file);
   return 0;
}

The above code prints the content of example.txt to the console as result.−

Welcome to tutorials point

Here the program reads lines from example3.txt using fgets and prints them until feof confirms that the end of the file has been reached.

#include <stdio.h>

int main() {
   FILE *file = fopen("example3.txt", "r");
   if (file == NULL) {
       perror("Failed to open file");
       return 1;
   }

   char buffer[256];
   while (fgets(buffer, sizeof(buffer), file) != NULL) {
       printf("%s", buffer);
   }

   if (feof(file)) {
       printf("End of file reached.\n");
   }

   fclose(file);
   return 0;
}

After execution of above code,the content of example3.txt will be printed line by line, followed by the message:

End of file reached.

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