Exercise#1: The sum of the interior angles of a triangle is 180 degrees. Write a program that reads two interior angles of a triangle in degrees, and then calculates the third angle and print its value. The program should then print a message telling whether the triangle is equilateral (all angles equal), isoceles (exactly two angles equal),or scalene (no two angles equal) Sample input-output (1) Enter the value of two angles: 60 60 The value of the third angle is: 60 The triangle is equilateral Sample input-output (2 Enter the value of two angles: 60 50 The value of the third angle is: 70 The triangle is scalene Exercise#2: A mail order house sells five different products whose retail prices are: Product 1 Product2 Product3 Product 4 Product 5 AED 3.0 AED 4.50 AED 10.5 AED 5.98 AED 6.69 These prices are to be initialized in your program. Write a program that prompts the user to enter a (product, quantity) pair to calculate its retail price. Your program should use a if-else structure to help determine the retail price for each product. Exercise#3: Rewrite exercise (2), but at this time, read the prices of each product from file Then prompts the user to enter a (product, quantity) pair to calculate its retail price. And instead of using if-else statements, use switch structure