n, return the sum of its decimal digits. For 0, return 0.Digit Sum
L1 Easy Arrays & Hashing
Concept
Grabbing the decimal digits of a number by repeatedly dividing by 10 is a classic loop.
n % 10 yields the last digit and n / 10 drops it.For a non-negative integer
Examples
▸ n = 123
→ 6
▸ n = 9009
→ 18
▸ n = 0
→ 0
Progressive Hints
Hint 1 · Nudge
Peel a number apart one digit at a time, starting from the back.
Hint 2 · Plan
Repeatedly take the last digit with n % 10 and add it to a running total, then chop that digit off with integer division by 10. Stop once n reaches 0.
Hint 3 · Approach
total = 0. While n > 0: total = total + (n % 10); n = n / 10 (integer division). Return total.
All hints are out. Take a breath and give it a shot.
Output
// Run your code to see the output here.