Web Reference: 19.Java Certification-Chapter03.Declarations & Operations-Lesson11.Widening and Narrowing. - YouTube /* (Compute the perimeter of a triangle) Write a program that reads three edges for a triangle and computes the perimeter if the input is valid. Otherwise, display that the input is invalid. In this lesson we look at all types of class declaration and extension and how to use interfaces and the package and import statements. We examine the declaration, initialization and usage of primitives, arrays, enums, and objects as static, instance, local variables and their respective scopes.
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