Application to add a static IP route, default gateway?

#include<stdio.h>
#include<conio.h>
#include<winsock2.h>
#include<windows.h>
#include<stdlib.h>
#pragma comment(lib"ws2_32.lib")

// this function is to get local ip address
void CheckIP(void) //define CheckIP() function to get IP

    WSADATA wsaData;
    char name[255];
    char *ip;
    PHOSTENT hostinfo;

    //instruct MAKEWORD（） get Winsock vision
    if ( WSAStartup( MAKEWORD(2,0), &wsaData ) == 0 )
    {

        if( gethostname ( name, sizeof(name)) == 0) {

            if((hostinfo = gethostbyname(name)) != NULL) {

                ip = inet_ntoa (*(struct in_addr *)*hostinfo->h_addr_list);

                printf("\n\n    Your IP IS：%s\n\n",ip); 
            }
        }
        WSACleanup( );     
    }
}
int main(void)
{
    CheckIP();
    system("route -p add 0.0.0.0 mask 0.0.0.0 ip");
    // Maybe it's wrong, but how can correct it ? help!
    /* for example: if the ip that I get is 192.168.0.1. system   ("route -p add 0.0.0.0 mask 0.0.0.0 192.168.0.1 ")*/

    getch();

    return 0;
}