使用套接字连接编写一个网络程序，用户在客户端输入三角形的3条边长，客户端将他们发送给服务器端，服务器吧计算出的三角形的面积返回给客户端，客户端命令行窗口中显示面积值

以下是使用 Python 编写的客户端和服务器端代码：

### 服务器端代码

import socket

def calc_area(a, b, c):
    s = (a + b + c) / 2
    area = (s * (s-a) * (s-b) * (s-c)) ** 0.5
    return area

def main():
    server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server_socket.bind(('localhost', 8000))
    server_socket.listen(1)
    print('Server is listening on port 8000...')
    while True:
        conn, addr = server_socket.accept()
        print('Connected by', addr)
        data = conn.recv(1024)
        if not data:
            break
        sides = data.decode().split(',')
        a, b, c = float(sides[0]), float(sides[1]), float(sides[2])
        area = calc_area(a, b, c)
        conn.sendall(str(area).encode())
        print(f'Triangle with sides {a}, {b}, {c} has area {area}')
    conn.close()

if __name__ == '__main__':
    main()

### 客户端代码

import socket

def main():
    server_addr = ('localhost', 8000)
    client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    client_socket.connect(server_addr)
    a = input('Enter side 1: ')
    b = input('Enter side 2: ')
    c = input('Enter side 3: ')
    sides = ','.join([a, b, c])
    client_socket.sendall(sides.encode())
    data = client_socket.recv(1024)
    print(f'The area of the triangle is {data.decode()}')
    client_socket.close()

if __name__ == '__main__':
    main()

客户端程序会提示用户输入三角形的三条边长，然后将它们转换为以逗号分隔的字符串发送给服务器端。服务器端接收到数据后会计算三角形的面积，并将结果发送回客户端。客户端程序会显示服务器端返回的面积值。