Input and Output

So far you've only printed hard-coded values. Now you'll make your program interactive by reading input from the user.

What you'll learn

• How to read text input with input()
• How to convert strings to numbers with int() and float()
• A cleaner way to format output with f-strings
• How to combine input and output in a useful program

Instructions

1. The starter code has a greeting program that asks for a name.
2. Extend it to also ask for the user's birth year.
3. Calculate their approximate age (use 2025 as the current year).
4. Print a message like: "Hi Alice! You are about 25 years old."

Use the stdin tab in the output panel to provide test input (one value per line).

Key concepts

input() always returns a string, even if the user types a number:

name = input("What is your name? ")     # returns str
year = input("What year were you born? ") # returns str — "1999", not 1999

To do math with the input, convert it first:

year = int(input("What year were you born? "))
age = 2025 - year

Common conversions:

• int("42") → 42 (whole number)
• float("3.14") → 3.14 (decimal)
• str(42) → "42" (back to text)

f-strings are a cleaner way to do what + and str() did in the last lesson. Put f before the opening quote and drop variables straight into the string with {}:

print("Age: " + str(age))     # the long way (lesson 2)
print(f"Age: {age}")          # the f-string way (same output)

You don't have to call str() — f-strings convert numbers, booleans, floats automatically.

Hints

• input() pauses the program and waits for a line of text. In this editor, input comes from the stdin tab.
• If you forget int(), you'll get a TypeError when you try to subtract.
• Put each input prompt on its own line in the stdin tab.