Q1/write a function declaration and function definition for a function called read_filter that has no parameters and that returns a value of type double.The function read_filter prompts the user for a value of type double and reads the value into a local variable.The function returns the value read provided this value is greater than or equal to zero and returns zero if the value read is negative.

Q2/write a function definition for a function called even that takes one argument of type int and returns a bool value.The function returns true if its one argument is an even number otherwise, it returns false.