do this in c++ as soon as possible.

Given an integer, num, the following recursive definition determines the sum of the even digits comprising the integer num, written sumevensum): sumevens(num)=0,sunevens(10nun),num%10+sunevens(10nun),whennum0whennum>0andnum%10isoddwhennum>0andnum%10isever Write a recursive function, sumevens, that takes an integer as a parameter and retums the sum of the even digits comprising that integer. For example, sumevens(12345) returns 6