Write a program that takes as inputs the lengths of three sides of a triangle and displays in a message box whether the triangle is scalene, isosceles, or equilateral. Following are some useful facts:...

Write a program that takes as inputs the lengths of three sides of a triangle and displays in a message box whether the triangle is scalene, isosceles, or equilateral. Following are some useful facts:

■ In a triangle, the longest side must be less than the sum of the other two sides.

■ A scalene triangle has all sides unequal.

■ An isosceles triangle has two sides equal.

■ An equilateral triangle has all sides equal.