C or CPP doesn’t support socket programming?

When compile c socket script, errors happened:

server.c:23:11: warning: implicit declaration of function 'socket' is invalid in C99 [-Wimplicit-function-declaration]
server = socket(AF_INET, SOCK_STREAM, 0);
^
server.c:29:2: warning: implicit declaration of function 'bind' is invalid in C99 [-Wimplicit-function-declaration]
bind(server, (struct sockaddr *)&server_address, sizeof(server_address));
^
server.c:30:2: warning: implicit declaration of function 'listen' is invalid in C99 [-Wimplicit-function-declaration]
listen(server, 20);
^
server.c:37:12: warning: implicit declaration of function 'accept' is invalid in C99 [-Wimplicit-function-declaration]
client = accept(server, (struct sockaddr *)&client_address, &client_address_len);