编写TCP程序，由客户端发送正整数n，服务端计算n!并返回

以下是一个简单的TCP程序实现：

客户端代码：

import socket

def factorial(n):
    if n == 0:
        return 1
    else:
        return n * factorial(n-1)

host = 'localhost'
port = 8888

client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect((host, port))

n = int(input("Enter a positive integer: "))
client_socket.send(str(n).encode())

result = client_socket.recv(1024).decode()
print("Factorial of", n, "is", result)

client_socket.close()

服务端代码：

import socket

def factorial(n):
    if n == 0:
        return 1
    else:
        return n * factorial(n-1)

host = 'localhost'
port = 8888

server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.bind((host, port))

server_socket.listen(1)
print("Listening for incoming connections...")

while True:
    conn, addr = server_socket.accept()
    print("Connection from:", addr)

    data = conn.recv(1024).decode()
    n = int(data)

    result = factorial(n)
    conn.send(str(result).encode())

    conn.close()

运行服务端程序后，客户端程序可以通过输入一个正整数n，向服务端发送请求。服务端接收到请求后，计算n!并返回给客户端。客户端程序接收到结果后，输出n!的值。