C

write a binary file c

FILE *write_ptr;

write_ptr = fopen("test.bin","wb");  // w for write, b for binary

fwrite(buffer,sizeof(buffer),1,write_ptr); // write 10 bytes from our buffer

Read Binary File in C Language

int main()
{
    FILE *file = fopen("input.txt", "r");
    char buffer[2048];

    if (file)
    {
        /* Loop will continue until an end of file is reached i.e. fread returns 0 elements read */
        while (fread(buffer, 4, 1, file) == 1)
        {
            printf("%s", buffer);
        }
        fclose(file);
    }
}