Note: in mathematics, the square root of a negative number is not real; in java therefore, passing such a value to the square root function returns a value known as nan (not-a-number). given a double variable named areaofsquare write the necessary code to read in a value, the area of some square, into areaofsquare and print out the length of the side of that square. however: if any value read in is not valid input, just print the message "invalid". assume the availability of a variable, stdin, that references a scanner object associated with standard input