Why we use perform in COBOL?
Perform Verb in COBOL is used to execute a set of COBOL statements. It is vital in keeping a cobol program structured by making it possible to call different paragraphs or sections from another paragraph or section.
How many types of perform are there in COBOL?
PERFORM statements in COBOL are broadly divided into two categories. These categories are further subdivided into different variants. Let’s look at each category one by one. INLINE PERFORM Statement.
How does perform until work in 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.
When to use test before or after in COBOL?
As TEST BEFORE condition is used,before coming into paragraph the condition is checked first. As the condition is valid,execution didn’t go to paragraph. 3. If there is no TEST condition, then by default TEST BEFORE is used. That’s why the paragraph was not even executed once.
Which is the default condition in a COBOL statement?
JCL to execute the above COBOL program. When you compile and execute the above program, it produces the following result − 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.
What is the syntax of perform varying in COBOL?
Perform Varying. In perform varying, a paragraph will be executed till the condition in Until phrase becomes true. Syntax. Following is the syntax of perform varying −. PERFORM A-PARA VARYING A FROM 1 BY 1 UNTIL A = 5. Example
How many times do you perform a para in COBOL?
PERFORM TIMES is mainly used to execute the block of statements or paragraphs/sections repetitively with the number of times specified. PERFORM A-PARA 5 TIMES. PERFORM 100-MAIN-PARA THRU 100-MAIN-PARA-X 10 TIMES. In this example the number of times perform statement is going to be executed is predetermined.