I tried writing a simple program which can calculate a couple of numbers entered. The result works fine only that that data type (double) which i declared the result to be in gives me a .00 value instead of maybe a .45 value or .86 value. It automatically rounds off the value which is kinda annoying. Anyone in the house who has an idea on this should help me out please.

epospiky:
I tried writing a simple program which can calculate a couple of numbers entered. The result works fine only that that data type (double) which i declared the result to be in gives me a .00 value instead of maybe a .45 value or .86 value. It automatically rounds off the value which is kinda annoying. Anyone in the house who has an idea on this should help me out please.

Can u post your code also

sunnico:

Can u post your code also

I am not with my pc right now. I will post the full code later in the evening if need be. Here is how i declared the method to be kind of.

poblic double setResult = ((data1*2)+(data2*3)+(data3*3)+(dat4*2)+(data5*2)/19

i think the issue is with ur data1,data2..., did u define them as an integer type,
if yes u can either change thier data type to double or use a cast operator i.e
double setResult = double((data1*2)+(data2*3)+(data3*3)+(dat4*2)+(data5*2))/19;


*note public is used to reference variables outside the class not inside it, from the little i know

Cast it to int or long

.simple

sunnico:
i think the issue is with ur data1,data2..., did u define them as an integer type,
if yes u can either change thier data type to double or use a cast operator i.e
double setResult = double((data1*2)+(data2*3)+(data3*3)+(dat4*2)+(data5*2))/19;


*note public is used to reference variables outside the class not inside it, from the little i know

yeah i defined them as integers kind of. I couldn't get string value directly from the textfield so i converted them from string to integer using Integer.parseInteger().
This is how i actually declared the result to be
public double setResult {
(return
(data1*2)+(data2*3)+(data3*3)+(dat4*2)+(data5**3))/19}

epospiky:

yeah i defined them as integers kind of. I couldn't get string value directly from the textfield so i converted them from string to integer using Integer.parseInteger().
This is how i actually declared the result to be
public double setResult {
(return
(data1*2)+(data2*3)+(data3*3)+(dat4*2)+(data5**3))/19}

Okay, just use The cast operator as i said earlier dat should do it...

public double setResult {

return double((data1*2)+(data2*3)+(data3*3)+(dat4*2)+(data5*2))/19;}

epospiky:


I am not with my pc right now. I will post the full code later in the evening if need be. Here is how i declared the method to be kind of.

poblic double setResult = ((data1*2)+(data2*3)+(data3*3)+(dat4*2)+(data5*2)/19

Your error is in using '/' to divide by 19, as in Java this will give a rounded result. Change 19 to 19.0 to force it to be a double.

In addition to what the poster above me said, why are multiplying with integers?

omohayek:


Your error is in using '/' to divide by 19, as in Java this will give a rounded result. Change 19 to 19.0 to force it to be a double.

Thanks bro. It really worked. But there is another problem. It is giving me too many long numbers after the decimal point. I want it to round off the number to exactly two decimal places. How can i achieve that?

danvery2k6:
In addition to what the poster above me said, why are multiplying with integers?

yeah, i am multiplying the integers by those numbers in order to have specific values which i didn't declare at the beginning. Each data when entered is multiplied by the value of the textfield kinda.

epospiky:

yeah, i am multiplying the integers by those numbers in order to have specific values which i didn't declare at the beginning. Each data when entered is multiplied by the value of the textfield kinda.

So Java does this thing called implicit type casting. When you try to perform arithmetic between another type and an Integer, the other type gets converted to an integer. its better you would have multiplied by doubles, say 2.0, 3.0, etc.

danvery2k6:


So Java does this thing called implicit type casting. When you try to perform arithmetic between another type and an Integer, the other type gets converted to an integer. its better you would have multiplied by doubles, say 2.0, 3.0, etc.

uhmmm...i don't think there will be a problem if multiply them by integers(say 2,3 e.t.c). All datas entered are in integer data type except the result which of course i expect to be in double data type.

epospiky:

Thanks bro. It really worked. But there is another problem. It is giving me too many long numbers after the decimal point. I want it to round off the number to exactly two decimal places. How can i achieve that?

Use the https://docs.oracle.com/javase/7/docs/api/java/text/DecimalFormat.html class - the API page has the details on how to do this.

I think that you have a casting issue.
I recommend also this website to learn about casting in java.

use printf to format the output when outputting the result e. g System.out.printf("%.2f", identifier); this outputs your result in two decimal places.