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 if I want to append data to an existing binary file?

You can open the file in append mode using "ab" for writing. Here's how:

file = fopen("data.bin", "ab");
// Use fwrite to append data
fwrite(newData, sizeof(int), newSize, file);
fclose(file);