Write declarations for each of the following functions. When you write these declarations, use the name of the function to indicate what the function does

Write declarations for each of the following functions. When you write these declarations, use the name of the function to indicate what the function does.

(a) A function named compare that returns a bool and has two parameters that are references to a class named matrix. (b) A function named change_val that returns a vector<int> iterator and takes two parameters: One is an int and the other is an iterator for a vector<int>.