Thus, in short, we can say that each function must hide some details.
The refinement decides what a particular function performs. It also decides a function's pre and
post conditions, that is, what data the function takes and what output it will provide. The data
used in these functions must be exactly declared. The data that can be used in a function is of
five types.
1) Input parameters: These parameters are utilized by the function. The function cannot change
the value of the variables permanently if values are passed only by method 'pass by value.'
2) Output parameters: These parameters ho
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