Linux C/C++ UDP sockets

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C++

C

Linux

UDP

sockets

Hello, I want to send a packet or a string over the internet in C,
and most of my questions that i have asked on diffrent forum just don't really help,
so i have used something from a webpage that maybe can help ppl help me.

You can download the file:
Here[^]

And the place i found it on:
Here[^]

What I have tried:

in the download file i tried to use the udp-send.c Becuse i want to send something over the internet so that can only be the logical thing.

The Error it have me:

udp-send.c: In function ‘int main()’:
udp-send.c:26:17: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings]
  char *server = "xxx.xx.xx.xx"; /* change this to use a different server */
                 ^
udp-send.c:53:41: error: ‘inet_aton’ was not declared in this scope
  if (inet_aton(server, &remaddr.sin_addr)==0) {
                                         ^
udp-send.c:66:10: error: ‘close’ was not declared in this scope
  close(fd);
          ^