Exercise_03_19.java solved incorrectly

[jdeisenberg]

The problem asks for the edges (lengths of the sides) of the triangle, not the vertex points.

If you enter points (1, 1), (2, 2), and (3, 3), your program will say that it is a valid triangle -- but these points describe a straight line, not a triangle.

By the way, several students in my class copied this wrong solution and lost a large number of points for doing it incorrectly -- and for plagiarism.