struct in_addr {
union {
struct {
u_char s_b1,s_b2,s_b3,s_b4;
} S_un_b; //An IPv4 address formatted as four u_chars.
struct {
u_short s_w1,s_w2;
} S_un_w; //An IPv4 address formatted as two u_shorts
u_long S_addr; //An IPv4 address formatted as a u_long
} S_un;
};
#include
#include
#include
#pragma comment(lib, "ws2_32.lib")
int main()
{
in_addr addr;
addr.S_un.S_un_b.s_b1 = 222;
addr.S_un.S_un_b.s_b2 = 205;
addr.S_un.S_un_b.s_b3 = 41;
addr.S_un.S_un_b.s_b4 = 160;
printf("%s\n", inet_ntoa(addr)); //222.205.41.160
in_addr addr1;
addr1.S_un.S_un_w.s_w1 = htons((222 << 8) + 205);
addr1.S_un.S_un_w.s_w2 = htons((41 << 8) + 161);
printf("%s\n", inet_ntoa(addr1)); //222.205.41.161
in_addr addr2;
addr2.S_un.S_addr = htonl((((((222 << 8) + 205) << 8) + 41) << 8) + 162);
printf("%s\n", inet_ntoa(addr2)); //222.205.41.162
}
