32bit-64bit small-endian big-endian

gistfile1.txt

#include <iostream>

int main(int argc, char* argv[]) {
    std::cout << sizeof(void *) << std::endl;
    std::cout << sizeof(int *) << std::endl;
    std::cout << sizeof(double *) << std::endl;
    int* p = 0x0;
    p++;
    if (p == (int *)0x4) {
        std::cout << "32 bit" << std::endl;
    }
    // 0x01 0x02 0x03 0x04
    //
    union {
        int i;
        char c;
    } x;
    x.i = 0x87654321;
    if (x.c == 0x87) {
        std::cout << "big endian" << std::endl;
    }
    else if (x.c == 0x21) {
        std::cout << "small endian" << std::endl;
    }

    int xx = 0x87654321;
    char c = *(char *)&xx;
    std::cout << (int)c << std::endl;
    return 0;
}