问如何打印端口号的值？

EN

int main(int argc, char **argv){
    struct addrinfo hints, *res, *p;
    int status;
    char ipstr[INET_ADDRSTRLEN];

    memset(&hints, 0, sizeof hints);
    hints.ai_family = AF_INET;
    hints.ai_socktype = SOCK_STREAM;
    //  hints.ai_flags = AI_NUMERICSERV;//leaving this off for now

    if((status = getaddrinfo(argv[1], argv[2], &hints, &res)) != 0) 
    {
        fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(status));
        return 2;
    }
    `for(p = res; p != NULL; p = p->ai_next)
    {        
    void *addr;

    struct sockaddr_in *ipv4 = (struct sockaddr_in *)p->ai_addr;
    addr = &(ipv4->sin_addr);
    inet_ntop(p->ai_family, addr, ipstr, sizeof ipstr);
    printf("%s\n", ipstr);
    }

    printf("IP addresses for %s:\n\n", argv[1]); //displays IP correctly
    printf("Port for %s: ", argv[2]); // doesn't display port number
    freeaddrinfo(res);

    return 0;
}