If num is an int which expression always evaluates to true if num holds an odd number

num%2==1

The modulo operator (%) divides the left hand side by the right hand side and returns the remainder. When dividing an odd number by 2 there will always be a remainder of 1.

no. when the asker posts the question they can make a question worth what ever they think is a fair price. although it must be within the limit of the points they currently own. 5 is the minimum number of points a question can be worth. if a question is complicated or has lots of parts to it, it is better to make it worth more because more people will be more willing to answer.

hope this !