How can I check wether an integer is even or not?
Kartoffelbrot wrote ...
2013/7/28
Even numbers
Use the modulus operation:
if ( value % 2 == 0 ) // executes when 'value' is even if ( value % 2 == 1) // executes when 'value' is odd
What does % do exactly? Does it remove (in this case) 2 as long as it is possible to don't get negative?
That is one way of looking at it.
Either way, what you are doing is dividing by some number and after dropping the number of times the number goes into it, return what is left (the remainder).
It works with negative numbers as well; the number returned will be the negative value of what the positive counterpart returns.
int value = Greenfoot.getRandomNumber(100); int remainder = value % 2; // is equivalent to int value = Greenfoot.getRandomNumber(100); int remainder = value - (value/2)*2;
thanks
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