How do I read and write binary files in C?

How do I read and write binary files in C?

To read and write binary files in C, you can use the fopen, fread, and fwrite functions. Would you like a code example?

Yes, please provide a code example.

Here's a simple example:

#include <stdio.h>

int main() {
    FILE *file;
    int data[5] = {1, 2, 3, 4, 5};

    // Writing to a binary file
    file = fopen("data.bin", "wb");
    fwrite(data, sizeof(int), 5, file);
    fclose(file);

    // Reading from a binary file
    int readData[5];
    file = fopen("data.bin", "rb");
    fread(readData, sizeof(int), 5, file);
    fclose(file);

    return 0;
}

This code writes an array of integers to a binary file and then reads it back.

What happens if the file doesn't exist when I try to read it?

If the file doesn't exist when you try to read it, fopen will return NULL. You should always check if the file was opened successfully before proceeding.