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Taken from the Processing WIKI here: https://github.com/processing/processing/wiki/Troubleshooting
Why does 2 / 5 = 0 instead of 0.4?
The result of dividing two integers will always be another integer:
int a = 2; int b = 5; int result = a / b; // result is zero
While somewhat confusing at first, this is later useful for more advanced programming.
To get fractions, use a 'float' instead:
float a = 2.0; float b = 5.0; float result = a / b; // 'result' will be 0.4
It is not enough to just divide two integers and set them to a float:
float y = 2 / 5;
In this case, integer 2 is divided by 5, which is zero, and then zero is assigned to a float. The number doesn't become a float until the left hand side of the = sign. On the other hand, this:
float y = 2.0 / 5;
will work just fine. In this case, Java sees that 2.0 is a float, so it also converts the 5 to a float so that they can be divided, which makes it identical to:
float y = 2.0 / 5.0;
and because floats are being used on the right hand side, the result will be a float, even before it gets to the left hand side.