The problem is: "2.1.(Validating triangles) Write an application that reads three nonzero values entered by the user and determine and prints whether they could represent the edges of a triangle. The three values are valid if the sum of any two edges is greater than the third edge. Your class name should be IsTriangle."

If user inputs a nonzero value (or less than zero), is the program supposed to tell the user that their input is invalid? Thanks.

So it's fine if the user's able to input a negative or 0 number?

so what is isupposed to output ?