Chapter 5.3, Problem 16STE

Program Plan Intro

Functions calling functions:

• A function body can contain a call to another function.
• It acts as same as if called from a main function.
• The declaration for function should appear before usage of function.
• In programs all function declarations come after main function.
• A function call can be placed within another function’s definition.
• The definition of one function could not be placed within body of definition of another function.

Precondition and Post conditions:

• A function declaration comment can be written as two types of information that is precondition and post condition.
• When a function is called, the precondition states conditions to be true.
• The function could not be used or perform correctly unless precondition holds.
• The post condition describes function call effect; it states conditions to be true after execution of function where precondition holds.
• The post condition describes value returned by function if it returns one.
• The post condition describes changes made to argument values for a function that may change values of variables.