はい頑張って勉強します

/* very simple daytime client */
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
int main() {
int sockfd, n;
char buf[127];
struct sockaddr_in servaddr;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(13);
inet_pton(AF_INET, "127.0.0.1", &servaddr.sin_addr);
connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
n = read(sockfd, buf, 126);
buf[n] = 0;
fputs(buf, stdout);
exit(0);
}