请问怎么用inet

nvert a string like "192.168.0.1" to a integer

struct sockaddr_in sock;
/*...*/
sock.sin_addr.s_addr=inet_addr("192.168.0.1");
/*...*/

谢谢两位SIR，上面的代码和给的链接看得不是很明白。这是我写的，请帮看看错在哪里？

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
main ()
{
char in_addr_t ;
in_addr_t=inet_addr(" 211.100.7.101");
printf ("%s\n",in_addr_t);
}

in_addr_t是一定义好的类型，
在/usr/include/netinet/in.h

typedef uint32_t in_addr_t;

main ()
{
in_addr_t addr ;
addr=inet_addr(" 211.100.7.101");
printf ("%d\n",addr);
}

      1 #include <sys/socket.h>
      2 #include <netinet/in.h>
      3 #include <arpa/inet.h>
      4
      5 main ()
      6 {
      7   in_addr_t addr ;
      8   addr=inet_addr("211.92.88.40");
      9 //        addr = inet_addr("127.0.0.1");
     10   printf ("%d\n",addr);
     11 }

我成功收到值了。呵呵
676879571
可惜看不到字符串。是怎么看到的啊。？

为什么我不行，出了一大堆的错误？
这是源代码：
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
main()
in_addr_t addr;
addr=inet_addr("211.100.7.101");
printf("%d\n",addr);
}

# gcc -c inet_addr.c
In file included from inet_addr.c:1:
/usr/include/sys/socket.h:52: syntax error before `sa_family_t'
/usr/include/sys/socket.h:52: warning: data definition has no type or storage cl
ass
/usr/include/sys/socket.h:163: syntax error before `u_char'
/usr/include/sys/socket.h:174: syntax error before `u_short'
/usr/include/sys/socket.h:188: syntax error before `u_char'
/usr/include/sys/socket.h:190: `int64_t' undeclared here (not in a function)
/usr/include/sys/socket.h:190: `u_char' undeclared here (not in a function)
/usr/include/sys/socket.h:190: size of array `__ss_pad1' is too large
/usr/include/sys/socket.h:191: syntax error before `int64_t'
/usr/include/sys/socket.h:192: `u_char' undeclared here (not in a function)
/usr/include/sys/socket.h:192: `int64_t' undeclared here (not in a function)
/usr/include/sys/socket.h:192: `u_char' undeclared here (not in a function)
/usr/include/sys/socket.h:192: `int64_t' undeclared here (not in a function)
/usr/include/sys/socket.h:359: syntax error before `pid_t'
/usr/include/sys/socket.h:364: syntax error before `gid_t'
/usr/include/sys/socket.h:399: syntax error before `u_short'
/usr/include/sys/socket.h:407: syntax error before `caddr_t'
/usr/include/sys/socket.h:411: syntax error before `caddr_t'
In file included from inet_addr.c:1:
/usr/include/sys/socket.h:444: syntax error before `recv'
/usr/include/sys/socket.h:444: syntax error before `size_t'
/usr/include/sys/socket.h:444: warning: data definition has no type or storage c

inet_addr.c: In function `main':
inet_addr.c:6: syntax error before `addr'

看样子你好像没有装头文件似的