Notice: This page requires JavaScript to function properly.
Please enable JavaScript in your browser settings or update your browser.Lære Closing Files with fclose | Introduction and File Streams
C File Handling Basics

bookClosing Files with fclose

The fclose function in C is used to close a file that was previously opened using functions like fopen. Closing a file is crucial because it ensures that all data written to the file is properly saved, and it releases system resources associated with the file. The syntax for closing a file is fclose(FILE *stream);, where stream is the pointer to the file you want to close.

main.c

main.c

copy

              
123456789101112131415161718

            
#include <stdio.h>

int main() {
    FILE *file = fopen("example.txt", "w");
    if (file == NULL) {
        printf("Failed to open file.\n");
        return 1;
    }

    fprintf(file, "Hello, file handling in C!\n");

    // Always close the file when done
    if (fclose(file) == 0) 
        printf("File closed successfully.\n");
    else 
        printf("Error closing the file.\n");
    return 0;
}

If you do not close a file using fclose, you risk losing unsaved data and causing resource leaks. This can lead to unpredictable program behavior or running out of file handles, especially in larger applications.

question mark

What does fclose return on successful file closure?

Select the correct answer

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 1. Kapitel 4

Spørg AI

expand

Spørg AI

ChatGPT

Spørg om hvad som helst eller prøv et af de foreslåede spørgsmål for at starte vores chat

Awesome!

Completion rate improved to 12.5

bookClosing Files with fclose

Stryg for at vise menuen

The fclose function in C is used to close a file that was previously opened using functions like fopen. Closing a file is crucial because it ensures that all data written to the file is properly saved, and it releases system resources associated with the file. The syntax for closing a file is fclose(FILE *stream);, where stream is the pointer to the file you want to close.

main.c

main.c

copy

              
123456789101112131415161718

            
#include <stdio.h>

int main() {
    FILE *file = fopen("example.txt", "w");
    if (file == NULL) {
        printf("Failed to open file.\n");
        return 1;
    }

    fprintf(file, "Hello, file handling in C!\n");

    // Always close the file when done
    if (fclose(file) == 0) 
        printf("File closed successfully.\n");
    else 
        printf("Error closing the file.\n");
    return 0;
}

If you do not close a file using fclose, you risk losing unsaved data and causing resource leaks. This can lead to unpredictable program behavior or running out of file handles, especially in larger applications.

question mark

What does fclose return on successful file closure?

Select the correct answer

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 1. Kapitel 4
some-alt