a) Define a function called median in Prolog that takes at least three parameters: x,y,z and computes their median. For e.g. median of 3, 2, 5 is 3 because in sorted order 3 comes between 2 and 5.

AND

b) Define a function called leap in Prolog that takes at least one parameter: a year and evaluates to true if the year is a leap year and evaluates false otherwise.

These problems are from logic programming . Code the solutions on prolog. (swish.swi-prolog.org) show screenshot of the out please.