Converting a string to the corresponding value of type double

Hey, im a really noob at this, but I need some help with this question. I've got to complete this in order to progress to my second year although im not doing programming and will not need it in the second year. The question is as follows:
"Write a method called convertDouble as follows:
public double convertDouble (String value) {
This method should convert its parameter (a string like "3.1415") to the corresponding value of type double. If the string supplied is not a valid number, it should return 0.0 as its result. Note that you can use the method Double.parseDouble() to do the hard work for you. "
To be honest I dont really have a clue what how to write this so any help would be much appreciated. Cheers guys

Well the simplest way is to use Java's already inbuilt converter:
which is if you have a string S which represents a double i.e 3.142
You can use
double number = Double.parseDouble(S); and thats it.
The other way to do it is to loop through the string and check whether it is a number
by using Character.IsDigit(ch) ? or somethign similar.
and if it is a digit then subtract a fixed amount depending on its ASCII value.
so if character with a value of 40 represents 0 (im not sure if it does) then
any Digit character - 40 would give you the decimal value.
Please ask questions if i dont make sense.
Edited by: z0rgy on Aug 18, 2008 7:36 AM

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