incompatible types: String cannot be converted to double

Question

String LOA, LWL, Beam, Displacement, SailArea;
LOA = stdin.readLine(); //(LOA) Total Length of Vessel
System.out.println("LOA: " + (LOA));
System.out.println("HullSpeed: " + (1.34 * Math.pow(LWL, 0.5)));

Can I get help? I'm new to java and have no idea how to fix this error with the last LWL.
incompatible types: String cannot be converted to double

What is the value of LWL?

Reut Sharabani
– Reut Sharabani

2015-09-09 06:24:01 +00:00
Commented Sep 9, 2015 at 6:24 — Reut Sharabani
– Reut Sharabani, Commented Sep 9, 2015 at 6:24
is there a way to use while or for loops?

OP- azLuffy
– OP- azLuffy

2015-09-09 06:41:21 +00:00
Commented Sep 9, 2015 at 6:41 — OP- azLuffy
– OP- azLuffy, Commented Sep 9, 2015 at 6:41

Reut Sharabani · Accepted Answer · 2015-09-09 06:22:07Z

5

If LWL is a String that represents a Double, try parsing that Double by using Double.parseDouble:

Double LWLDouble = Double.parseDouble(LWL);
System.out.println("HullSpeed: " + (1.34 * Math.pow(LWLDouble, 0.5)));

It's reasonable that you can not use a mathematical operations on a String.

answered Sep 9, 2015 at 6:22

Reut Sharabani

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Comments

Ghazanfar · Accepted Answer · 2015-09-09 06:22:13Z

0

See this part of your code,

System.out.println("HullSpeed: " + (1.34 * Math.pow(LWL, 0.5)));

Here, LWL is of String type Math.pow() does not take a String argument it takes a double.

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