Give the function definition for the function with the following function

declaration. Embed your definition in a suitable test program.

void get_double(double& input_number);

//Postcondition:input_number is given a value

//that the user approves of.

You can assume that the user types in the input in normal everyday

notation, such as 23.789, and does not use e-notation to type in the

number. Model your definition after the definition of the function get_int

given in Display 8.3 so that your function reads the input as characters,

edits the string of characters, and converts the resulting string to a number

of type double. You will need to define a function like read_and_clean that

is more sophisticated than the one in Display 8.2, since it must cope with

the decimal point. This is a fairly easy project. For a more difficult project,

allow the user to enter the number in either the normal everyday notation,

as discussed above, or in e-notation. Your function should decide whether

or not the input is in e-notation by reading the input, not by asking the user

whether she or he will use e-notation