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Chapter 4 — Chapter 4 — Control Structures in Python

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Topic 1 · pp. 52–55 · Free

Decision Making

Source: CS 10, Ch 4, pp. 52–55

📘Easy summary

Control structures manage decision-making and repetition. if runs a block when a condition is True; if-else gives an alternative when False; if-elif-else checks several conditions in order; nested conditions place an if inside another. Blocks are defined by indentation. if marks >= 80: print("A") elif marks >= 60: print("B") else: print("C")

⭐Key points

  • else runs when condition is False.

🔬Diagram

if-elif-elseCheck condition 1True → block 1Else check condition 2Else → else block

🌿Real-life example

Even/odd with n % 2 == 0.

💡Exam tip

  • Indentation.

✅Quick check

1. Executes when false:

2. Purpose of control structures:

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