检测CPU字节序

#include <stdio.h>

int CheckCpuEndian(void)
{
    union CpuEndian
    {
        int a;
        char b;
    }c;
    
    c.a = 1;
    return (1 == c.b);
}

int main(int argc, char** argv)
{
    if (!CheckCpuEndian())
    {
        printf("Big endian.\n");
    }
    else
    {
        printf("Little endian.\n");
    }
    
    return 0;
}