不包含全頭文件的後果相當嚴重

#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <stdlib.h>
//#include <sys/types.h>    //BUG
//#include <arpa/inet.h>    //BUG


int main(void)
{
    int socketfd,socketfd_server;
    struct sockaddr_in myaddr,cliaddr;
    socklen_t addrlen;
    
    socketfd=socket(PF_INET,SOCK_STREAM,0);
    memset(&myaddr,0,sizeof(myaddr));
    myaddr.sin_family=PF_INET;
    myaddr.sin_port=htons(8000);
    myaddr.sin_addr.s_addr=inet_addr("127.0.0.1");
    addrlen=sizeof(myaddr);
    bind(socketfd,(struct sockaddr*)&myaddr,addrlen);
    listen(socketfd,10);

    addrlen=sizeof(cliaddr);
    memset(&cliaddr,0,sizeof(cliaddr));
//    while(1)
//        {
    socketfd_server=accept(socketfd,(struct sockaddr*)&cliaddr,&addrlen);//這裏需要注意是&addrlen
    printf("歡迎登錄%s端口:",inet_ntoa(cliaddr.sin_addr));
    printf("hello\n");
    printf("歡迎登錄端口:%hd",ntohs(cliaddr.sin_port));
    close(socketfd_server);
    
//        }
    
}

gcc編譯時報警告

liu@XXXXX:~/FAR_SIGHT/Day_30/Day_30/LAB$ gcc Server.c

Server.c: In function ‘main’:

Server.c:30:2: warning: format ‘%s’ expects type ‘char *’, but argument 2 has type ‘int’

man inet_ntoa

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
INET(3)                    Linux Programmer's Manual                   INET(3)

NAME
       inet_aton,    inet_addr,    inet_network,   inet_ntoa,   inet_makeaddr,
       inet_lnaof, inet_netof - Internet address manipulation routines

SYNOPSIS
       #include <sys/socket.h>
       #include <netinet/in.h>
       #include <arpa/inet.h>

       int inet_aton(const char *cp, struct in_addr *inp);

       in_addr_t inet_addr(const char *cp);

       in_addr_t inet_network(const char *cp);

       char *inet_ntoa(struct in_addr in);

       struct in_addr inet_makeaddr(int net, int host);

       in_addr_t inet_lnaof(struct in_addr in);