网络编程day1-(理论)

作业一、

用联合体（共用体）的方式验证计算机是大端还是小端？

#include 
#include 
#include 
#include 
#include 
#include 
#include 

union
{
    int i;
    char c;

} *p, u;

int main(int argc, const char *argv[])
{
    p = &u;
    unsigned int a = 0x87654321;
    //p->i = &a;
    p->c = *(char *)&a;

    if (0x21 == p->c)
    {
        printf("little endian\n");
    }
    else if (0x87 == p->c)
    {
        printf("big endian\n");
    }
}