26

Phase 6 - Category 1: Number Logic

Chapter 26 • Advanced

90 min

Phase 6 - Category 1: Number Logic

Introduction

This phase combines all previous concepts - conditionals, loops, recursion, arrays, and strings - to solve complex, real-world problems.

Problem-Solving Approach

  1. Understand: Read the problem carefully
  2. Plan: Break into smaller subproblems
  3. Choose Tools: Select appropriate techniques
  4. Implement: Write code step by step
  5. Test: Verify with multiple test cases

Key Strategies

  • Decomposition: Break complex problems into simpler parts
  • Pattern Recognition: Identify similar problems you've solved
  • Incremental Development: Build solution step by step
  • Edge Cases: Consider boundary conditions

Common Challenge Types

  • Multi-step number manipulation
  • Complex conditional logic
  • Nested loops and iterations
  • Combining multiple data structures

Hands-on Examples

Complex Number Validation

# Example: Check if number meets multiple criteria
num = int(input("Enter a number: "))

# Check multiple conditions
is_positive = num > 0
is_even = num % 2 == 0
is_two_digit = 10 <= num <= 99
sum_of_digits = sum(int(d) for d in str(num))
sum_is_even = sum_of_digits % 2 == 0

if is_positive and is_even and is_two_digit and sum_is_even:
    print("Number meets all criteria")
else:
    print("Number does not meet all criteria")

Combine multiple conditions using logical operators. Check each property separately for clarity.

Previous
Phase 5 - Category 5: Word-level Operations
Next
Phase 6 - Category 2: String + Logic Mix

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