不知道如何运行unix网络编程下面的代码

最近下了本电子书，unix网络编程，我的安装的操作系统是CentOS 5.5 ,把源代码导入之后，按照着readme.txt那个说明编译运行了一遍，发现有些报错内容，忽略过去了，但是就是运行第一个程序的时候就报错，非常郁闷：
[root@localhost intro]# ./daytimetcpcli1 127.0.0.1-bash: ./daytimetcpcli1: No such file or directory[root@localhost intro]# ./daytimetcpcli 127.0.0.1connect error: Connection refused
本来是想学C语言的网络编程的，但是第一个程序就跑不起来，对我的打击相当的大啊，在网上找了半天也没有详细的说明如何用里面的方法，都是很大牛的口气告诉新手，直接改代码吧。。。让我很是无奈。。。我只知道用C写的源文件可以用gcc来编译，但是里面的源代码我用GCC这个命令来编译，就报一大堆的错，相当的郁闷。。。
[root@localhost intro]# ./daytimetcpcli1.c 127.0.0.1./daytimetcpcli1.c: line 3: int: command not found./daytimetcpcli1.c: line 4: syntax error near unexpected token `int'./daytimetcpcli1.c: line 4: `main(int argc, char **argv)'[root@localhost intro]# gcc daytimetcpcli1.c daytimetcpcli1.c:1:17: error: unp.h: No such file or directorydaytimetcpcli1.c: In function amaina:daytimetcpcli1.c:7: error: aMAXLINEa undeclared (first use in this function)daytimetcpcli1.c:7: error: (Each undeclared identifier is reported only oncedaytimetcpcli1.c:7: error: for each function it appears in.)daytimetcpcli1.c:8: error: storage size of aservaddra isnat knowndaytimetcpcli1.c:13: error: aAF_INETa undeclared (first use in this function)daytimetcpcli1.c:13: error: aSOCK_STREAMa undeclared (first use in this function)daytimetcpcli1.c:16: warning: incompatible implicit declaration of built-in function abzeroadaytimetcpcli1.c:22: error: aSAa undeclared (first use in this function)daytimetcpcli1.c:22: error: expected expression before a)a tokendaytimetcpcli1.c:28: error: astdouta undeclared (first use in this function)daytimetcpcli1.c:28: error: aEOFa undeclared (first use in this function)daytimetcpcli1.c:34: warning: incompatible implicit declaration of built-in function aprintfadaytimetcpcli1.c:35: warning: incompatible implicit declaration of built-in function aexita 我准备下个FreeBSD来试试，莫非是操作系统的版本不对的问题吗。。。总之，这次尝试是让我相当的不开心啊