simple math for variable

this is a real basic but I'm struggling to see why this is not working

I am trying to set a variable as a percentage in order to show a progress bar

but the below returns p1 & p2 as 0 (delta is a positive number)

  delta = (tidesData[14] - tidesData[13]) /60;
            p1 = (75 / 100) * delta ;
            p2 = (25 / 100) * delta;

what is the correct syntax within monkeyc to do this math?

However, this does return a result

p1 = (100/4) * delta ;

Top Replies

Shent-Aurkhan (SHN) over 4 years ago +1 verified

hi,

that is normal use instead:

delta = (tidesData[14] - tidesData[13]) /60.0;
p1 = (75.0 / 100.0) * delta ;
p2 = (25.0 / 100.0) * delta;

because 75/100 = 0 since it is number format, you have ti use…

All Replies

+1 Shent-Aurkhan (SHN) over 4 years ago

hi,

that is normal use instead:

delta = (tidesData[14] - tidesData[13]) /60.0;
p1 = (75.0 / 100.0) * delta ;
p2 = (25.0 / 100.0) * delta;

because 75/100 = 0 since it is number format, you have ti use float format, 75.0/100.0

0 nonparametric over 4 years ago

Integer division as the default is one of the worst features of the programming language imo.

0 jim_m_58 over 4 years ago in reply to nonparametric

It's based on the type of the variables used. It's the default with 2 Numbers

10/6 is 1 as you are using Numbers.

10/6.0 is 1.666667 as one of the values is a Float

I think it would be odd if you divided two Numbers and got something other than a Number as the result.

0 nonparametric over 4 years ago in reply to jim_m_58

Yes, I’m aware of the reason that 10/6 = 1, my point is that it is a poor design choice that 10/6 = 1 is the default behavior for the language.

Edit to add:

More sensible behavior would be for / to promote its arguments to float (or double if at least one argument is double). Include a separate integer division operator for the 1% of use cases where that is actually what is desired. For example, 10 %/% 6 = 1.

0 jim_m_58 over 4 years ago in reply to nonparametric

There are times you want a Number from dividing two Numbers and it's easy enough to make one of the two numbers a float and get a float for the result.

If I divide two Numbers, I'd expect a Number for the result, a Number and a Float, the result is a Float. A Long and a Number, the result is a long.

It's in the doc and sure won't change after 7 years.