Draw the CALLS graph for your sample program, and check whether the graph is a DAG or not.

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1. Define some useful relations among modules other than the relations discussed in this chapter. 2. Classify the changes discussed in as either perfective, adaptive, or corrective maintenance. 3. Consider a program you have written in the past in a programming language like Ada, Modula-2, C, or Pascal. (Here we employ Ada, but the exercise can be adapted quite easily to any of these languages.) Consider Ada library units as corresponding to the concept of a module that we are using in this chapter. Also, define a relation CALLS between any two modules such that; CALLS; if and only if a call to a procedure or function in; is issued within M. a. Unlike the assumption we made in would it make any sense to define CALLS as a reflexive relation? b. What follows from requiring CALLS to be a hierarchy? c. Draw the CALLS graph for your sample program, and check whether the graph is a DAG or not.

 

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