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1. Print Line of N Stars Recursively2. Print Square of Stars Recursively3. Print Triangle (Top-Down) Recursively4. Print Triangle (Bottom-Up) Recursively5. Number Patterns Recursively6. Print Reverse Triangle Recursively7. Multiplication Table Recursively8. Increasing + Decreasing in One Function9. Sum Series with Steps Recursively10. Character Patterns Recursively

Increasing + Decreasing in One Function

Print numbers increasing then decreasing recursively.

AdvancedPhase 3 - Level 3: Pattern RecursionExample 8 of 10
increasing-decreasing-in-one-function.py
1def print_inc_dec(n, current=1):
2    # Base case
3    if current > n:
4        return
5    
6    # Print increasing
7    print(current, end=" ")
8    # Recurse
9    print_inc_dec(n, current + 1)
10    # Print decreasing (after recursion)
11    if current < n:
12        print(current, end=" ")
13

14# Test
15n = int(input("Enter n: "))
16print_inc_dec(n)
17print()

Output

Enter n: 5
1 2 3 4 5 4 3 2 1

What's going on

Print before recursion (increasing), after (decreasing).

Key Concepts:

Print before recursion: increasing order
Print after recursion: decreasing order
Creates symmetric pattern

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