38 Computer -- Modular Programming

What is modular programming? Mention any four advantages of modular programming.

1 Answers

Modular programming is a programming technique in which a program is divided into many small logical, manageable and functional parts.

Any four advantages of modular programming are listed below:
1) The same procedure can be used more than once without rewriting it. So, it reduces the length of the program.
2) Individual procedure can be written independently so; it is suitable for a teamwork.
3) The debugging of the program becomes easier and faster.
4) The procedure can be tested and developed separately.

What is procedure? List the types of procedures.

The small, logical and functional part of the program is known as procedure or module.

The types of procedures are listed below:
1) SUB procedure.
2) FUNCTION procedure.

Mention any two differences between ‘sub procedure’ and ‘function procedure’.

SUB procedure	FUNCTION procedure
A SUB procedure is a small, logical and functional part of a program that doesn't return any value to the calling module.	A FUNCTION procedure is a small, logical and functional part of a program that returns a value to the calling module.
We print in sub module in this procedure.	We print in main module in this procedure.

What do you mean by argument and parameter?

The constants or variables included in the parenthesis of the calling statement are known as argument. It is also known as actual parameter.

The variables included in the parenthesis of the procedure which accepts constants or variables passed to them from the calling module is known as parameter. It is also known as formal parameter.

What do you mean by argument passing by reference method?

Argument passing by reference method means the method of passing arguments to the procedure in which the addresses of the variables are passed with the parameters with the same memory addresses.

What is variable?

Variable is a value that can change, depending on conditions or on information passed to the program.

Define local and global variable?

A variable which is defined in a module and is not accessible to any other modules is known as local variable.

A variable which is defined in main module and can be accessed from any procedure of the program is known as global variable.

Mention the difference between local variable and global variable.

Local variable	Global variable
A variable which is defined in a module and is not accessible to any other modules is known as local variable.	A variable which is defined in main module and can be accessed from any procedure of the program is known as global variable.

Which statement is used to call sub procedure?

The CALL is statement is used to call a SUB procedure.

[CALL] name [([argumentlist])]
where,
‘name’ is the name of the SUB procedure to be called.
‘argumentlist’ is the list of constants or variables that are passed to the SUB procedure. The list of variables or constants is separated with commas.

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