C / C++ / MFC

	  void input (int p, int q); // what is this semi-colon doing here?
{

#include <stdio.h>
#include <stdlib.h>

int main()
{
    void *ptr = malloc(1024);
    char *tmp = ptr;

    for(size_t i = 0; i < 24; i++, ++tmp) {
        long double *d = (long double *)tmp;
        *d = i * 2.0L;
        printf("tmp = %p, d = %p *d = %Lf\n", tmp, d, *d);
    }

    free(ptr);

    return 0;
}

k5054 wrote:

I think you need to be careful with #pragma pack. X86-64 doesn't seem to have a problem accessing unaligned data, but I assume its slower to do so than correctly aligned data.

struct S {
    int i;
    double d;
    char str[25];
};

S s;

std:ifstream data("data.bin", std::ios:binary);
data.read(reinterpret_cast<char *>(&s), sizeof s);