1. Chapter 4 TCP 서버/클라이언트
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Lab 3

2. Why Socket Programming?
“To build any Networked Application”
WWW ( Internet Explorer , Firefox )
FTP (Filezilla)
P2P (Limewire, Bit-torrent)
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3. TCP Server – Client interaction
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4. Telephone Analogy Socket() – Endpoint for communication (Telephone)
Bind() - Assign a unique telephone number (Phone No)
Listen() – Wait for a caller.
Connect() - Dial a number.
Accept() – Receive a call.
Send(), Recv() – Talk.
Close() – Hang up.
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5. Question 1
Write a TCP Server Program to convert all received message from Client to UPPERCASE.
Send the UPPERCASE message back to client.
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6. Sample Output Question 1
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7. Question 2 Write a Body Mass Index (BMI) Calculator Server Program.
A useful tool to estimate a healthy body weight based on how tall a person is.
Developed by Adolphe Quelet( ), and was known as the Quetelet Index.
Client sends Weight(kg) and Height(m) to server
Server return BMI value and weight status
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8. Question 2 - continue
BMI ( kg/m² ) = weight in kilograms —————————— height in meters²
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BMI
Weight Status
< 18.5
Underweight
Normal
Overweight
>= 30
Obese

9. Sample Output Question 2
Enter your Height(cm): 175
Enter your Weight(kg): 68
======================
Your BMI value:
Your weight status: Normal
Enter your Height(cm): 174
Enter your Weight(kg): 80
Your BMI value:
Your weight status: Overweight !
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10. Question 3 Modify FileSender.cpp to display % of data has been sent.
20% data has been transferred successfully.
50% data has been transferred successfully.
78% data has been transferred successfully.
89% data has been transferred successfully.
100% data has been transferred successfully.
File transfer success !
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11. Thank you
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