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New to JAVA and Frustrated with the math

  Asked By: Harry    Date: Apr 15    Category: Java    Views: 687
  

Big time mainframe background and am trying to learn JAVA on my own.
So here is my simple question...

I am trying to create test data and insert into my DB2 database. Why
doesn't the math work here.

double myNumber = 0;

if (myNumber < .15){
myNumber =+ .0001;
}else{
myNumber = .04;
}

when I insert into the database, myNumber is always the same value
of .0001? This seems like simple logic but it is making me go nuts.
Should I be using the BigDecimal to get this to work?

What simple concept am I missing.... Please be easy on the old guy...

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6 Answers Found

 
Answer #1    Answered By: Amir Shaikh     Answered On: Apr 15

It looks like you have the operands out of order.

Change "=+" to "+=" and it should owrk just fine.

Your code:

double myNumber = 0;

if (myNumber < .15){
myNumber =+ .0001;
}else{
myNumber = .04;
}

Should read:
double myNumber = 0;

if (myNumber < .15){
myNumber += .0001;
}else{
myNumber = .04;
}

 
Answer #2    Answered By: Abriana Rossi     Answered On: Apr 15

myNumber += .0001;............................

 
Answer #3    Answered By: Mario Ryan     Answered On: Apr 15

Man I should fully wake up before reading stuff

 
Answer #4    Answered By: Garry Sanchez     Answered On: Apr 15

Would that be because you have set myNumber to always equal 0 hence my
number is always going to be < .15?

 
Answer #5    Answered By: Chung Tran     Answered On: Apr 15

I figured it out... jeeze this JAVA is picky... the fix is to use

+= not =+

there is a big  difference in the result.

 
Answer #6    Answered By: Salvador Alexander     Answered On: Apr 15

Wait until you mix up "=" and "==".

Then, you'll have some real fun trying to find the error.

 
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