Horew to write a parsePolynomial in Java?

Question

parsePolynomial -- this method takes one parameter (a String) and returns a new Polynomial. The parameter is a String that represents a polynomial of the form similar to 2x^2+5.You must return a new instance of a Polynomial that correctly represents the string.

You will have to use some of the methods in the Java String class, so you should probably review the online documentation for the Java String class. For example, you might want to look at the replaceAll(), lastIndexOf(), charAt() and substring() methods (among others).

`You will have to use some of the methods in the Java String class, so you should probably review the online documentation for the Java String class.` Did you actually do that? Or you just want us to do it for you? :( — Rihards, Apr 02 '11 at 21:43

score 2 · Accepted Answer · answered Apr 02 '11 at 21:36

2

First split at the +es so you get parts of either the form 2x^2 or 5.

Next test if they contain x^ and if yes use that to split them again so you get the coefficient and the exponent. Then parse them as double and int and you're done.

answered Apr 02 '11 at 21:36

CodesInChaos

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Nice way to walk the line, helpful without just outright giving the answer. – Kevin D Apr 02 '11 at 21:50

Horew to write a parsePolynomial in Java?

1 Answers1