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12th Standard English Medium Computer Science Subject Function Book Back 3 Mark Questions with Solution updated Book back Questions

Published on: 13/05/2022

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Questions:

3 Marks

Mention the characteristics of Interface.

Why strlen is called pure function?

What is the side effect of impure function. Give example.

Differentiate pure and impure function.

Wha happens if you modify a variable outside the function? Give an example.

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Answers Key:

3 Marks

(i) The class template specifies the interfaces to enable an object to be created and operated properly.
(ii) An object's attributes and behaviour is controlled by sending functions to the object.

(i) Strlen is a pure function because the function takes one variable as a parameter, and accesses it to find its length.
(ii) This function reads external memory but does not change it, and the value returned derives from the external memory accessed.

The variables used inside the function may cause side effects though the functions which are not passed with any arguments. In such cases the function is called impure function.
For example the mathematical function random() will give different outputs for the same function call.
let randomnumber :=
a := random()
if a > 10 then
return: a
else
return: 10

S.No	Pure Function	Impure Function
(i)	The return value of the pure functions solely depends on its arguments passed.	The return value of the impure functions does not solely depend on its arguments passed.
(ii)	If you call the pure functions with the same set of arguments, you will always get the same return values.	If you call the impure functions with the same set of arguments. You might get the different return values.
(iii)	They do not have any side effects.	They cause side effects. For example: random(),Date()
(iv)	They do not modify the arguments which are passed to them	They may modify the arguments which are passed to them

The most popular groups of side effects is modifying the variable outside of function.
For example:
let y: = 0
(int) inc (int) x
y: =y+x;
return (y)
In the above example the value of y get changed inside the function definition due to which the result will change each time.