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Example of Redefines clause:
This illustration describes a sales record that may either contain the total amount of sale or the quantity (QTY) and UNIT-PRICE. The aim of such description may be to have two types of records and their types may be determined from the data item named SALES-TYPE. Based on some predetermined values of SALES-TYPE the record will be interpreted in one of the two forms, Note that the SALES-BY-UNIT and TOTAL-SALES refer to the similar storage space. They actually represent two different mappings of the similar storage region.
The REDEFINES clause as explained above is quite common in use. Though, the clause may be simply used for the aim of conservation of storage space possibly in the working-storage section. In such situations two records having no meaningful connection between them can also be used to share similar storage space provided both of them are not used in the program concurrently. The syntax of the REDEFINES clause is as shown below:
Level-number daa-name-1 REDEFINES data-name-2
what does it used
PROGRAM FOR COMPUTE VERB: We have to write an easy program to elaborate the COMPUTE verb. Identification division. Program- id. compverb. Environment division. Da
Comparison of Nonnumeric Operands: A nonnumeric operand can be compared to the other nonnumeric operand according to the rules as shown below: (i) Fields of Equal Sizes:
RELATIVE FILES: The Files that are stored on a direct access storage medium like magnetic disk are frequently known as direct access files. The COBOL supports three different
BLOCK CONTAINS CLAUSE: Integer -1 of the BLOCK CONTAINS clause indicates the block size either in terms of records or in terms of characters. For illustration, BLOCK CONTAINS
Figurative Constants: The Figurative constants have several fixed names and the compiler recognizes these names and it sets up the equivalent values in the object program.
PROGRAM FOR SCREEN SECTION WITH FILES: identification division. program- id. environment division. input-output section. file-control. select
ARITHMETIC VERBS: Most of the problems need some computations to be performed on the input or intermediate data that are numeric in nature. The Arithmetic verbs are used to pe
PROGRAM FOR MULTIPLY VERB: We have to write a simple program to elaborate MULTIPLY verb. You can also use the edit characters in the program. Identification division. Pr
RULES FOR OCCURS CLAUSE: The rules apply for the OCCURS clause and the subscripts are as shown below. (1) The integer in the OCCURS clause should be a positive integer.
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