Make a function, int countTrue$($bool a$,$ bool b$,$ bool c $,$bool d$),$ which reads four true$/$false values and returns the number of trues. Then, write a program $($Exercise$4.$cpp$)$ to test the function to type $4$ bool values $($true or false$)$ and display the number of trues. The cin object needs to use "boolalpha" flag to read true as a bool value instead of string value of "true". The following shows two test cases.

Type four true$/$false values here.

true false true false

# of trues is: $2$

Type four true$/$false values here. false true true true

# of trues is: $3,$