How can I reorder the bytes of an integer? [duplicate]

Answer 1

This is my sample. It reverses the endianess of an integer. Notice that C doesn't specify the size of int. It could be 16, 32, 64 ... Using the (uint_16t, uint_32t, uint_64t) instead if you want to ensure the size,

void reverse_endianess(int* number)
{
    char byte_arr[8] = {0};
    int i;

    for (i=0; i < sizeof(int); i++) {
        byte_arr[i] = (*number & 0xFF);
        *number = *number >> 8;
    }

    *number = 0;

    for (i=0; i < sizeof(int); i++) {
        *number |=  byte_arr[i];
        *number = *number << 8;
    }
}