Converting strings to double

Programming Questions

isa.hay1

in Programming Questions • 24 days ago

Hi, new to processing.

I am trying to convert user input using strings into double. Any ideas on house to do this?

Or is there a better way to accept user input?

double user_temp;

double user_wind_speed;

PFont f;

// Variable to store text currently being typed

String typing = "";

// Variable to store saved text when return is hit

String saved = "";

void setup() {

size(600,450);

f = createFont("Arial",15,true);

}

void draw() {

background(255);

int indent = 25;

// Set the font and fill for text

textFont(f);

fill(0);

// Display everything

text("Click in this box and start entering the values. \nHit return to save what you typed. \n Enter the Air Temperature:", indent, 40);

text(typing,indent,100);

text(saved,indent,130);

Thanks.

Replies(4)

PhiLho

Re: Converting strings to double

24 days ago

Why use the double type? I think the float type, the default used in Processing for all its math functions should be enough, no?
In this case, you can use float x = float("3.14"); or similar.

isa.hay1

Re: Converting strings to double

24 days ago

Hey PhiLho,

So in my code, the user enters a number and this is accepted as a string.

text(typing,indent,100);

I can use float but I also want to compare it with double.

How can I convert the user input into double type?

Thanks.

GoToLoop

Re: Converting strings to double

24 days ago

Processing only use float as its fractional data-type for all of its API.
If you still wanna use double, you gotta use original Java classes and methods.
Check it out Double class for example -> http://docs.oracle.com/javase/6/docs/api/java/lang/Double.html

PhiLho

Re: Converting strings to double

23 days ago

As said by GoToLoop. In short, use:

double x = Double.parseDouble("3.14");
println(x);

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