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 A stack data structure is used on cases where the last-in-first-out (LIFO) is needed. For example, Undo is implemented using stack, ie., the most recently made change is undone first. The article explains a sample implementation of the stack using linked list in C.

Body Mass Index can be calculated using a simple formula kg/m2, where the weight is represented in kilograms (kg) and the height is represented in metres (m). The article discusses the various ways to calculate BMI using python programming language.