solve it in code:: blocks plzzzzz

Part1: Write a C++ function DigitSum that takes as a parameter an integer number. Your function should check if the passed parameters is positive then calculate and return back the Sum of Digits of the number. Hint: the sum of digits of (320)=3+2+0=5 the sum of digits of (56231)=5+6+2+3+1=17 Hint: use loop and \%, division /