Question

How to calculate modulus of negative number?

Answer 1

Modulus of any negative number will be positive number.

Answer 2

Consider two numbers a and b,where a is negative and b is positive then a%b can be calculated simply as (a+b)%b . For example: a=-2 ,b=20 so, (-2+20)%20 gives (18)%20 which is 18. Take another example: a=-3 b=5 so, (-3+5)%5 gives us 2.