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By Percy Mett (auth.)

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These three logical constructions-sequences, repetitions and choices-are sufficient for controlling the execution of a program design by a sequential computer. 20 Program Control 21 It may also be desirable, in the top-down design process, to defer further refinement of a particular step. The set of execution steps into which the step is refined may be recorded elsewhere, packaged and made available as a single entity, called a module, for execution as and when required. The complete statement of the solution-that is, the program-may include such groupings of steps as required by the specification of the solution.

Step 1 incorporates the instruction that the loop be traversed twenty times, with student taking the value 1 on the first traversal, 2 on the next, and so on until the final traversal when it has assumed the value 20. The net effect is identical with the sequence of steps output name(1} output name(2} output name(3) output name(20} Suppose now that each student in the class sits an examination and is awarded a mark, which is an integer in the range 0 to 100. These marks can be held in a parallel array mark().

Different procedural languages cater for different types of applications. COBOL is widely used in business and commercial applications where there is a high volume of processing activities, each activity being fairly simple. The COBOL language has developed considerably since it was first pioneered by Commander Grace Hopper of the United States Navy in the mid 1950s. At about the same time the scientific and engineering community developed FORTRAN as a language for expressing mathematical computations, especially those involving considerable numerical processing.

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