Topic
1. Print Numbers from 1 to 102. Print All Even Numbers Between 1 and 1003. Sum of First N Natural Numbers4. Print the Factorial of a Given Number5. Print All Odd Numbers Between 1 and 1006. Print Numbers from 10 Down to 17. Print Multiplication Table8. Sum of All Even Numbers Up to N9. Sum of All Odd Numbers Up to N10. Product of Digits11. Count Numbers Divisible by 312. Print Multiples of 5 Up to N13. Sum of Squares Up to N14. Print Alternating Numbers

Print Alternating Numbers

Print numbers 1 to n with alternating signs.

BeginnerPhase 2 - Level 1: Basic LoopingExample 14 of 14
print-alternating-numbers.py
1# Take n as input
2n = int(input("Enter n: "))
3

4# Print alternating
5for i in range(1, n + 1):
6    if i % 2 == 0:
7        print(-i, end=" ")
8    else:
9        print(i, end=" ")
10print()

Output

Enter n: 5
1 -2 3 -4 5

What's going on

Alternate signs based on even/odd.

Key Concepts:

Check if number is even
Print negative for even, positive for odd
Create alternating pattern

🔗Related Content

PreviousSum of Squares Up to N