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C File Handling Basics

bookClosing Files with fclose

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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

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#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?

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セクション 1. 章 4
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