Validate a Positive Integer Input

Easy ⏱ 8 min 76% acceptance ★★★★★ 4.8

Write a function safe_sqrt(n) that returns the square root of n (as a float) if n is a non-negative number, and returns the string "Invalid input" if n is negative. Validate before computing.

Examples

Example 1

Input

safe_sqrt(16)

Output

4.0

Explanation

16 is non-negative, so its square root 4.0 is returned.

Example 2

Input

safe_sqrt(-4)

Output

Invalid input

Explanation

Negative input is rejected before any computation is attempted.

Constraints

n may be an int or a float.
Do not let math.sqrt raise an exception for negative input — validate first.

Topics

Functionsinput validation

Companies

SalesforceServiceNow

Hints

Hint 1

Check `if n < 0` before calling sqrt.

Hint 2

n ** 0.5 also computes a square root without importing math.

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