#include<stdio.h> //頭文件,大家都會吧
#include<winsock2.h>
#pragma comment(lib,"ws2_32.lib")
void CheckIP(void) 
{
	WSADATA wsaData;
	char name[155];
	char *ip;
	PHOSTENT hostinfo; 
	if ( WSAStartup( MAKEWORD(2,0), &wsaData ) == 0 ) { 
		if( gethostname ( name, sizeof(name)) == 0) { 
			if((hostinfo = gethostbyname(name)) != NULL) { //這些就是獲得IP的函數(shù)
				ip = inet_ntoa (*(struct in_addr *)*hostinfo->h_addr_list); 
				
				printf("%s\n",ip);
			} 
		} 
		WSACleanup( );
} } 

int main(void)
{
	CheckIP();
	return 0;
}