please in C++ thank you

Problem 2 Assume you are given the following function: char doThat(int a, double &b, int &c) { if (a > c) { c = (int)b*a-- return 'a'; } else { b = b*(++a); c = (int)b; return 'b'; } } 1. What are the input and output parameters to the function doThat? 2. Write a main where you make a call to the function with appropriate parameters of your choice. 3- Trace a call to the function with parameters of your choice