Is String a Valid Number?

Statement

Given an input string, determine if a given string makes a valid number or not.

Notes:

• For simplicity, assume that white spaces are not present in the input.
• In case the input string is empty, the function should return TRUE.

Example

Example 1

Sample input

4.325

Expected output

true

Example 2

Sample input

1.1.1

Expected output

false

Try it yourself