CS50-Week-0

Solutions to CS50’s Week 0: Python assignments — Indoor Voice, Playback Speed, Making Faces, Einstein, and Tip Calculator.

CS50 Week 0 - Python Basics 🐍

This repository contains my solutions to CS50’s Week 0 (Python) problem sets.
The projects here introduce the fundamentals of programming in Python, including:

• Taking user input/output
• Performing string manipulation
• Using functions and variables
• Applying arithmetic operations
• Writing interactive programs

These problems are the first step of the CS50 journey, helping me build a strong foundation before moving to C, SQL, and web development.

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📂 Projects

1. Indoor Voice

Converts all uppercase input into lowercase, simulating an “indoor voice.”

• Concepts: Strings, .lower() function, user input
• Run:

  python indoor.py

##Example Run:

Input: HELLO, WORLD Output: hello, world 2. Playback Speed

Replaces spaces in user input with ... to mimic slower speech.

Concepts: String replacement with .replace()

Run:

 python indoor.py 

Example Run:

Input: This is CS50 Output: This...is...CS50

3. Making Faces

Replaces typed emoticons with emoji symbols.

:) → 😀

:( → 🙁

Concepts: Functions, string replacement, conditionals

Run:

python faces.py

Example Run:

Input: I am happy :) Output: I am happy 😀

Input: I am sad :( Output: I am sad 🙁

4. Einstein

Implements Einstein’s formula E = mc². The program prompts for mass (m, in kilograms) and outputs the equivalent energy (E, in joules).

Concepts: Arithmetic operations, integers, variables

Run:

python einstein.py

Example Run:

Input: 1 Output: 9000000000

Input: 50 Output: 450000000000

5. Tip Calculator

Calculates the tip based on the meal cost and desired tip percentage.

Concepts: Floats, arithmetic, string formatting, functions

Run:

python tip.py

Example Run:

Input: Cost of meal: $100 Input: Tip percentage: 15% Output: $15.00

Input: Cost of meal: $65.50 Input: Tip percentage: 20% Output: $13.10