# Valid Number InterviewBit Solution

**Problem:** Valid Number

**Problem Description:**

Validate if a given string is numeric.

**Examples:**

"0" => true

" 0.1 " => true

"abc" => false

"1 a" => false

"2e10" => true

Return 0 / 1 ( 0 for false, 1 for true ) for this problem

**Clarify the question using “See Expected Output”**

*Is 1u ( which may be a representation for unsigned integers valid?**For this problem, no.**Is 0.1e10 valid?**Yes**-01.1e-10?**Yes**Hexadecimal numbers like 0xFF?**Not for the purpose of this problem**3. (. not followed by a digit)?**No**Can exponent have decimal numbers? 3e0.1?**Not for this problem.**Is 1f ( floating point number with f as prefix ) valid?**Not for this problem.**How about 1000LL or 1000L ( C++ representation for long and long long numbers )?**Not for this problem.**How about integers preceded by 00 or 0? like 008?**Yes for this problem*

## Solution Approach

First, try to find if it has any character other than digits or not.

If it doesn't have any character other than a digit, you can return true.

If it has some characters in it, try to check whether it denotes a sign, exponent or decimal. If yes then you are good to go return true, otherwise false.

## Solution:

In C++