Conditions and Input

Explanation

1. Purpose

This program checks for an optional integer score from user input (defaulting to 82 if none is provided) and prints a feedback message based on that score.

2. Key Concepts

• User Input & Validation: Using Scanner methods (hasNextInt() and nextInt()) to read input safely without crashing.
• Default Values: Assigning a fallback value to a variable before checking for user input.
• Conditional Branching: Using an if-else if-else ladder with relational operators (>=) to categorize values.

3. Code Walkthrough

• Lines 5–6 (Setup): Sets a default score = 82 and initializes a Scanner to listen for user input from the console.
• Lines 7–9 (Safe Input): input.hasNextInt() checks if the user entered an integer. If yes, input.nextInt() updates score. If not (e.g., user enters text or presses EOF), the default score of 82 is preserved.
• Lines 11–17 (Classification):
  • If score >= 85, prints "Excellent work".
  • Otherwise, if score >= 70, prints "Good progress".
  • Otherwise (score is below 70), prints "Keep practicing".

4. Output

The output depends on the value entered:

• Default (no input provided) or input between 70 and 84:
  Good progress (Note: Since the default is 82, running without input triggers this)
• Input $\ge 85$ (e.g., 90):
  Excellent work
• Input $< 70$ (e.g., 65):
  Keep practicing