1. An invalid triangle (the sum of any two sides is less than or equal to the third side)

2. Equilateral (all sides are equal)

3. Isosceles (any two sides are equal)

4. Right (The sum of the squares of the two legs is equal to the square of the hypotenuse.)

5. Regular (if none of the above apply). If regular, also determine if the triangle is an

A. Acute triangle (the square of the longest side <= sum of the squares of the other

two sides) OR

B. Obtuse triangle (the square of the longest side exceeds the sum of the squares of

the other two sides.)

The criteria listed above should be tested in the order given. Treat the above criteria (1-5) as mutually exclusive so any particular case will satisfy only one criteria.

Process several cases of data with one run of your program and label all output appropriately.

Input for each case: 3 integer values representing the lengths of the sides of a possible triangle

Output for each case: the 3 input values

a message indicating the type of triangle OR an appropriate error message

Output to the screen. Use the following data as sample inputs (input only the 3 integers):

Side 1 Side 2 Side 3

Case 1 3 5 4

Case 2 4 3 2

Case 3 5 5 5

Case 4 3 6 3

Case 5 12 5 13

Case 6 -7 -7 -7

Case 7 7 5 5

Case 8 0 5 0

Terminate processing only when all three input values are zero. Print an appropriate error message if at least one side is equal to or less than zero but continue processing subsequent cases.

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How do you write code that can label the type of a triangle?

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Your itemized list {invalid, Equilateral, Isosceles, ... } is a good candidate for an enumeration type. Here is an explanation of how to use this (has examples, too):

http://www.cppreference.com/wiki/keywords/enum

From this link, you should be able write a few lines of code to create an object that has the labels for the type of a triangle. That would complete one step in your overall project.

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Then you could ask another related question. For example:

I show below code for a function that accepts three sides of a triangle and is supposed to return the triangle type. But it does not compile. I get the following errors using the xyz compiler in the ABC operating system:

- list the errors, including error codes

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Then after getting the errors fixed, you could ask another related question, for example:

I show below code for a function that accepts three sides of a triangle and is supposed to return the triangle type. But the program crashes (or maybe, the program returns the wrong answer).