Get IP by Hostnam

#include<stdio.h>
#include<stdlib.h>
#include<netdb.h>
#include<arpa/inet.h>


int main(int argc, char **argv) {
	struct hostent *host;
	char str[100];
	char addr[INET_ADDRSTRLEN];
	char **p;
	int c;
	while (1){
		c=0;
		gets(str);		
		printf("%s\n",str);
		if ((host=gethostbyname(str))==NULL){
			perror("host");
		break;
		}
		p=host->h_addr_list;
	
		for (;*p!=NULL;p++){
			c++;
			inet_ntop(AF_INET, *p, addr, INET_ADDRSTRLEN);
			printf("%d:%s\n", c, addr);
		}
	}
	return 0;
}