By A.J. Tyrrell, F.H. Sumner
This e-book is anxious with language talents and language figuring out instead of programming technique. No point out is made from trying out, and no recognition given to the surroundings during which courses has to be entered, or achieved. it's assumed reader could be acquainted with those matters.
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2 Pl. 1 Pl. 3. 4 The Use of Sections As an alternative to using paragraphs, the Procedure Division may be divided into sections. If sections are used then no isolated paragraphs may be declared ouside sections, and each section must contain at least one 34 Program Structures paragraph. Individual paragraphs within sections should not be called from outside the section. The section can be used as a means of grouping under one name a number of paragraphs that are executed sequentially or alternatively as a way of partitioning a large system.
It has also given the first example of the use of statement terminators provided by COBOL 85. You are advised to make notes initially on the use of COMPUTE and the ROUNDED and ON SIZE ERROR options. You should also make notes on the use of items containing decimal points (including the effects of the MOVE verb). Practical Exercises 1. A program accepts values from the keyboard for each of the following: Balance-Owing, Goods-Debited, Amount-Paid. Each field is non-integral. Balance-Owing is a signed field, and is calculated by subtracting AmountPaid from Goods-Debited.
No return statement is required in the called paragraph. The end of a paragraph is indicated either by the presence of the next paragraph declaration in area A (cols 8-11) or by the end of the source text. 2 shows how a paragraph may call one paragraph which itself calls another. CONTROL-PARA. PARA-lB. DISPLAY" Para lB has been executed". PERFORM STOP RUN. PARA-lA. PARA-lB. PARA-lC. DISPLAY "This is the last sentence of Para lB". PARA-lC. PERFORM DISPLAY "This is the last sentence of Para lC". 1 the concepts of procedural abstraction and hierarchical structure were illustrated with a simple example implemented in Pascal.