What is the difference in perform until and perform varying?
PERFORM VARYING is both in-line and out-of-line. It is similar to PERFORM UNTIL, but no initialization or increment required to specified separately for the literal used in condition. The VARYING phrase increases or decreases the value of one or more identifiers or index-names according to certain rules.
What is perform with test before Cobol?
In ‘perform until’, a paragraph is executed until the given condition becomes true. ‘With test before’ is the default condition and it indicates that the condition is checked before the execution of statements in a paragraph.
Why do we use perform in Cobol?
The PERFORM statement is used to transfer control explicitly to one or more procedures and to return control implicitly whenever execution of the specified procedure is complete. The PERFORM statement is used to control execution of one or more imperative statements which are in the scope of that PERFORM statement.
How many types of performs are there in Cobol?
PERFORM statements are used for looping in COBOL program, PERFORM is mainly classified into two types: Inline Perform. Outline Perform.
What is scope terminator in COBOL?
Explicit scope terminators end a statement without ending a sentence. They consist of END followed by a hyphen and the name of the statement being terminated, such as END-IF . An implicit scope terminator is a period ( . ) that ends the scope of all previous statements not yet ended.
What is static and dynamic call in COBOL?
Static Call occurs when a program is compiled with the NODYNAM compiler option. A static called program is loaded into storage at compile time. Dynamic Call occurs when a program is compiled with the DYNAM and NODLL compiler option. A dynamic called program is loaded into storage at runtime.
What is perform statement?
The PERFORM statement transfers control explicitly to one or more procedures and implicitly returns control to the next executable statement after execution of the specified procedures is completed.
What is perform in COBOL?
The PERFORM command transfers control explicitly to one or more statements and implicitly returns control to the next executable statement after execution of the specified statements is completed. The keywords cannot be abbreviated.
What is on size error in COBOL?
In Visual COBOL, the ON SIZE ERROR condition exists when the value resulting from an arithmetic operation exceeds the capacity of the specified picture-string. In RM/COBOL, the ON SIZE ERROR condition exists when the value resulting from an arithmetic operation exceeds the capacity for the associated data item.
Which call is faster static or dynamic?
static call
Because a statically called program is link-edited into the same load module as the calling program, a static call is faster than a dynamic call. A static call is the preferred method if your application does not require the services of the dynamic call.
How do you do in-line perform?
In-Line PERFORM
- PERFORM UNTIL test-condition. {STATEMENT/S} END-PERFORM. Example: PERFORM UNTIL A > 100. ADD 1 TO A.
- PERFORM WITH TEST BEFORE/AFTER UNTIL test-condition. {STATEMENT/S} END-PERFORM. Examples: PERFORM WITH TEST BEFORE UNTIL A > 100. ADD 1 TO A.
- PERFORM. {STATEMENT/S} END-PERFORM. Examples: PERFORM. MOVE A TO B.
Which of the following are the various formats of perform statement?
The PERFORM statement formats are:
- Basic PERFORM.
- TIMES phrase PERFORM.
- UNTIL phrase PERFORM.
- VARYING phrase PERFORM.
What is test after in COBOL?
WITH TEST AFTER is used to test the condition after executing the statements block. It simply executes the statements block without checking the condition. After one iteration completed, it validates the condition.
What is inline perform?
An inline PERFORM is an imperative statement that is executed in the normal flow of a program; an out-of-line PERFORM entails a branch to a named paragraph and an implicit return from that paragraph.
How to perform multiple tests at the same time?
1 Use the PERFORM statement to access code which needs to be executed from more than one location. 2 Use the PERFORM statement to structure your code. 3 Use the WITH TEST AFTER option to force the code to be PERFORMed at least once. 4 Use the VARYING …
What is the difference between test before and test after phrase?
Here the condition is tested before only at the beginning of each execution by default. But this default is overridden by TEST AFTER phrase. If the TEST AFTER phrase is specified, the statements to be performed are executed at least once before the condition is tested (corresponds to DO UNTIL).
What is the default condition for testing statements in a paragraph?
The default condition is ‘ WITH TEST BEFORE, ‘and it specifies that the condition is tested before the execution of statements in a paragraph. MOVE 10 TO WS-CNT PERFORM UNTIL WS-CNT = ZERO DISPLAY WS-CNT SUBSTRACT 1 FROM WS-CNT END-PERFORM.
What is the difference between in line perform and out line perform?
PERFORM WITH TEST AFTER UNTIL A > 100 END-PERFORM. END-PERFORM. END-PERFORM. Note: This format is used rarely. It is better to use ‘GO TO’ ( which is similar to In-Line perform) instead of just using this type of In-Line perform. Out-Line PERFORM is used to perform the repetitive tasks by calling another paragraph/s or section/s.