Converting data types in Java?

willsi_1989 · #1 05-15-2008, 02:34 PM

I wondered if it is possible to convert a "double" data type into a "integer" data type?

This is simply because I have calculated a formula which is giving me an answer in a "double" data type... and when i output the result I basically just want to knock off the decimal point and give the answer as an integer.

Doing this the way I would do it as a beginner at java just gives me the error, possible loss of precision.

I understand you may not be able to do it this way, and if its so its cool.

would appreciate it if people could give me some help.

Thanks in advance.

blessed_thang · #2 05-15-2008, 02:39 PM

Get real familiar with the
String.format()
method. Consider...
double dd = 555.5554;
System.out.println( String.format("double to int is: %3.0f", dd));

and the result is: 556 -- as a String

for a real int...
double dd = 555.5554;
int x = Integer.parseInt( String.format("%3.0f", dd) ); // this method uses String

And, what's going on? This is like the C language.
% = entity
3.0 = number of columns, number of decimals
f = a floating point number, either float or double

Because, in hacking we have to jump back and forth between String and a number and back again. String.format() has been the fastest technique I have learned from Java 1.5+.

Chad · #3 05-15-2008, 02:43 PM

you can do this;

(int)(a*b);

where a * b is returning a double.. the (int) will convert it to an integer.

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