Explain the statement, Subprograms are a powerful tool for abstraction. Describe two kinds of subprograms. Distinguish between the way in which the name of a subprogram appears in the calling unit in...

Explain the statement, Subprograms are a powerful tool for abstraction. Describe two kinds of subprograms. Distinguish between the way in which the name of a subprogram appears in the calling unit in the two kinds of subprograms described in Exercise 51. Describe how a parameter list is used to communicate information from the calling unit to the subprogram.