Answer 1

The problem is in
`Math.pow(s, strNum.length())`
Here, `s` is of type char. When you pass `s` to Math.pow(), it will be implcitly converted to int, which will be the ascii value of the character.

For example, if the input was "153" and `s` has the value '1', then the result of the call to Math.pow() will be
'1' ^ 3
= 49 ^ 3 ('1' converted to its ascii value)
= 117649

You can get the numeric value stored in 's' by using the Character.getNumericValue() method. So the call to Math.pow() will be changed to
`Math.pow( Character.getNumericValue(s), strNum.length() )`