Question

Match List - I with List - II. 

List - I		List - II
A.	typedef in C	I.	modifies the memory allocated to a variable
B.	enum in C	II.	stores memory address
C.	type casting	III.	is similar to struct
D.	pointer	IV.	redefines the name of existing data types

Choose the correct answer from the options given below:

• A. A-IV, B-III, C-II, D-I
• B. A-III, B-IV, C-I, D-II
• C. A-III, B-IV, C-II, D-I
• D. A-IV, B-III, C-I, D-II

Hint:

Remember: typedef is just a "nickname" for a type. enum is for lists of names. Pointer is an "arrow" pointing to a location in RAM.

Answer 1

The Correct Option is D

Concept:
• C language provides keywords and operators to manage how data types are defined, interpreted, and accessed in memory.

Step 1: Match A (typedef in C)
The typedef keyword is used to create an alias or a synonym for an existing data type. It "redefines the name of existing data types." This matches with IV.

Step 2: Match D (pointer)
A pointer is a variable whose value is the address of another variable. It "stores memory address." This matches with II.

Step 3: Match B (enum in C)
An enum is a user-defined type, similar to a struct or union, used to assign names to integral constants. In the context of categorization as a custom data structure, it "is similar to struct." This matches with III.

Step 4: Match C (type casting)
Type casting forces a variable of one data type to be treated as another. While "modifies memory allocated" is a slightly ambiguous phrase, it is the remaining pair. In dynamic memory allocation (e.g., malloc), type casting the returned void* pointer is essential to allocate and manage the intended memory block size. This matches with I.