Write a c++ function named findeven() that accepts only one double-precision number. findeven() return 1 if the value of the passed number is even otherwise returns -1. Then the main function in your...

Write a c++ function named findeven() that accepts only one double-precision number. findeven() return 1 if the value of the passed number is even otherwise returns -1. Then the main function in your c++ program will allow the user to input any positive number. Finally, the main function will display the returned value after calling the findeven() function in the output screen.