4. Implement a main function that uses each function declared below (Be sure to declare variables and assign values as needed): In other words, call the functions below inside main. void Calculate(int, int, int); void Print(char, double); void Open(char\&); double Calculation(int, int, int, int\&, double\&);.

1. 4. Implement a main function that uses each function declared below (Be sure to declare
variables and assign values as needed): In other words, call the functions below inside main. void
Calculate(int, int, int); void Print(char, double); void Open(char&); double Calculation(int, int,
int, int&, double&);