Define an enumeration type triangleType that has the values scalene, isosceles,
equilateral, and noTriangle.
Write a function triangleShape that takes as parameters three numbers, each of which
represents the length of a side of the triangle. The function should return the shape of the.
(Note: In a triangle, the sum of the lengths of any two sides is greater than the length of the
third side.)
Write a program that prompts the user to input the length of the sides of a triangle and outputs
the triangle.