very simple question, regarding maths in java

[Ibys]

Hi, i am just starting to learn javascript, so i am probably doing something very simple wrong. i have read a lot of articles on maths in java, but cant find anything simple enough for my problem. I am looking for how to get an IF statement to give me the correct output. I am trying to get it to give me a result for a weeks pay, taking that the code worked before i tried to add the IF statement, to make it that if HoursWorked >= 20, the rate of pay would be an extra $2 p/hr. i had the following code to make this work

if (HoursWorked >= 20)
{
  WeeksPay = parseFloat(HoursWorked) * parseFloat(RateOfPay + 2);
}
else
{
  WeeksPay = parseFloat(HoursWorked) * parseFloat(RateOfPay);
 

but, as simple maths will tell you, the answer is not $3800!! can anyone please tel me what silly mistake i am making here please :) sorry to be asking something so simple, but my teacher is away for the weekend and i have just started this module in my course.

[r035198x]

Java != Javascript.
I'll assume you meant what you said when you said javascript so I'll move this to the Javascript forum.

[Dormilich]

what are the HoursWorked and RateOfPay values, before the calculation?

[Ibys]

HoursWorked=prompt("How many hours did you work this week?","25");
RateOfPay=prompt("How much are you paid per Hour?","15")

i dont even know how it is getting the result it is, 3800... all the other tasks i have been doing have been working fine, even the more complicated ones.

[Dormilich]

that explains it…

parseFloat(RateOfPay + 2)

the + operator does not only adds numbers, it also concatenates strings. and that’s what’s happening.

better use

parseFloat(RateOfPay) + 2

[Ibys]

thankyou so much! it works fine now :)