10

Phase 2 - Level 5: Logical Loop Combinations

Chapter 10 • Advanced

105 min

Phase 2 - Level 5: Logical Loop Combinations

Introduction

This advanced level combines loops with complex logical conditions. You'll solve problems requiring multiple conditions, filtering, and sophisticated loop control.

Key Techniques

Conditional Accumulation

  • Sum only numbers meeting certain criteria
  • Count elements with specific properties
  • Filter and process selectively

Multi-Step Operations

  • Process numbers in multiple passes
  • Combine different operations
  • Chain logical conditions

Loop Control

  • break: Exit loop early
  • continue: Skip current iteration
  • Nested loops: Loops within loops
  • Conditional loops: Loops with complex conditions

Common Patterns

Filtering Pattern

python.js
for item in range(...):
    if condition:
        # Process item

Accumulation Pattern

python.js
result = 0
for item in range(...):
    if condition:
        result += item

Skip Pattern

python.js
for item in range(...):
    if skip_condition:
        continue
    # Process item

Problem Types

  1. Conditional Counting: Count numbers meeting criteria
  2. Selective Summation: Sum only specific numbers
  3. Multi-condition Filtering: Multiple conditions
  4. Digit Analysis: Process digits with conditions
  5. Range Operations: Operations on number ranges

Advanced Concepts

  • Early Exit: Using break for efficiency
  • Skip Iterations: Using continue strategically
  • Nested Conditions: Multiple if statements in loops
  • Complex Logic: Combining AND, OR, NOT operators

Hands-on Examples

Numbers with Even Digit Sum

# Find numbers 1-100 with even digit sum
print("Numbers with even digit sum:")
for num in range(1, 101):
    # Calculate digit sum
    digit_sum = 0
    temp = num
    while temp > 0:
        digit_sum += temp % 10
        temp //= 10
    
    # Check if sum is even
    if digit_sum % 2 == 0:
        print(num, end=" ")

For each number, calculate sum of digits. If sum is even, print the number. Use modulo to extract digits.

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Phase 2 - Level 4: Pattern Printing
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Phase 3 - Level 1: Basic Recursion

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