Tic Tac Toe is a well-known game for two players First, one of tho players should compile and execute game_server.c file, then both players need to compile game_client.c file and execute it with the server's port.
./game_server <port>
./game_client <server's ip-address> <port>
Then the game will show understandable instuctions.
The program exits itself as the game ends.