What is the output of this code? char ch = 'B'; switch(ch) { case 'A': case 'B': case 'C': printf("Vowel"); break; default: printf("Consonant"); }

The correct answer is A: Vowel. ch='B' matches case 'B', which has no statements. Execution falls through to case 'C' which has no statements, then prints 'Vowel' and breaks.

Which of the following macro definitions will correctly compute the absolute value? #define ABS(x) ((x)

The correct answer is A: Correct - uses ternary operator with proper precedence. The macro correctly uses the ternary operator with proper parenthesization. Each use of x is wrapped in parentheses to prevent precedence issues. This is a well-formed macro for computing absolute value.

What does the __VA_ARGS__ preprocessor feature allow in variadic macros?

The correct answer is A: Variable number of arguments to be passed to a macro. __VA_ARGS__ allows macros to accept a variable number of arguments. Example: #define PRINT(...) printf(__VA_ARGS__) enables flexible argument passing.

What is the output? int x = 50; int *p = &x; int *q = p; q = NULL; printf("%d", *p);

The correct answer is A: 50. Setting q to NULL doesn't affect p. p still points to x, so *p is 50.

How should dynamic 1D array of strings be declared for 5 strings of length 20?

The correct answer is A: char **str = (char**)malloc(5 * sizeof(char*)); for loop to allocate each string. For dynamic allocation, use double pointer char** and allocate memory for each string separately. Options B and C are static allocations.

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C Programming
Pointers

C language from basics to advanced placement prep

27 Q 10 Topics Take Mock Test

Difficulty: All Easy Medium Hard 21–27 of 27

Topics in C Programming

All Basics & Syntax 86 Data Types & Variables 97 Control Flow 100 Functions 99 Arrays & Strings 100 Pointers 99 Structures & Unions 100 File Handling 100 Dynamic Memory 98 Preprocessor 99

Q.21 Easy Pointers

What is the size of a pointer variable on a 32-bit system?

A 2 bytes

B 4 bytes

C 8 bytes

D Depends on the data type

Correct Answer: B. 4 bytes

EXPLANATION

On a 32-bit system, all pointers are 4 bytes (32 bits) regardless of the data type they point to.

Test

Q.22 Easy Pointers

A pointer variable stores the _____ of another variable.

A value

B memory address

C data type

D size

Correct Answer: B. memory address

EXPLANATION

Pointers store memory addresses of variables. The address-of operator (&) retrieves this address.

Test

Q.23 Easy Pointers

Identify the output:
char *str = "Hello";
printf("%c", *str);

A H

B Hello

C e

D Address

Correct Answer: A. H

EXPLANATION

*str dereferences the pointer to get the first character of the string, which is 'H'.

Test

Q.24 Easy Pointers

Which of the following is NOT a valid pointer declaration?

A int *p;

B float *q;

C void *r;

D int &s;

Correct Answer: D. int &s;

EXPLANATION

& is a reference operator used in C++, not in C. In C, pointers are declared using *.

Test

Q.25 Easy Pointers

What is a NULL pointer?

A Pointer pointing to address 0

B Uninitialized pointer

C Pointer with no name

D Invalid pointer

Correct Answer: A. Pointer pointing to address 0

EXPLANATION

A NULL pointer is a pointer that points to memory address 0, indicating it doesn't point to any valid memory location.

Test

Q.26 Easy Pointers

What will be the size of a pointer variable on a 64-bit system?

A 2 bytes

B 4 bytes

C 8 bytes

D 16 bytes

Correct Answer: C. 8 bytes

EXPLANATION

On a 64-bit system, a pointer is 8 bytes (64 bits) regardless of the data type it points to.

Test

Q.27 Easy Pointers

Which operator is used to get the address of a variable in C?

A *

B &

C ->

D .

Correct Answer: B. &

EXPLANATION

The & operator (address-of operator) returns the memory address of a variable.

Test

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Pointers