[25] write a c++ console application that prompts the user to input the length of a triangle (a, b, and c) and outputs the shape of the triangle. a) define an enumeration type triangletype that has values: i. equilateral, which is if all sides are the same; ii. scalene, which is if no two sides are the same; iii. isosceles, which is if any two of three sides are the same; iv. and notriangle. b) 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 triangle. (note: in a triangle, the sum of lengths of any two sides must be greater than the length of the third side.) c) write a sentinel controlled loop, that prompts the user to run the program until they enter the value "x", which will terminate the program. use appropriate parameters and do not include any global variables. take a screenshot of your output with the following inputs: i. 3,4,5 ii. 1,7,3