What does realloc() do if the new size is smaller than the old size?

The correct answer is B: Shrinks the memory block and returns a pointer. realloc() shrinks or expands memory. If new size is smaller, it reduces allocation and returns pointer to resized block.

Which of the following is valid pointer comparison?

The correct answer is C: p < q (valid pointers). Pointers of same type can be compared using , ==, !=. Comparing with integers or different types is invalid.

What will be the output? int arr[3][3] = {{1,2,3}, {4,5,6}, {7,8,9}}; int *p = (int *)arr; printf("%d", *(p+5));

The correct answer is B: 6. Converting 2D array to int pointer treats it as 1D. p+5 points to the 6th element (0-indexed), which is 6.

What is the size of 'char' data type in C?

The correct answer is C: 1 byte. The 'char' data type in C occupies 1 byte of memory and can store a single character.

What is the purpose of realloc() function?

The correct answer is B: To resize previously allocated memory block. realloc() resizes a previously allocated memory block. It can increase or decrease the size and preserves existing data.

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C Programming
Pointers

C language from basics to advanced placement prep

21 Q 10 Topics Take Mock Test

Difficulty: All Easy Medium Hard 21–21 of 21

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 Hard Pointers

What is the difference between *p++ and (*p)++?

A No difference

B *p++ increments pointer, (*p)++ increments value

C (*p)++ increments pointer, *p++ increments value

D Syntax error

Correct Answer: B. *p++ increments pointer, (*p)++ increments value

EXPLANATION

Due to operator precedence, *p++ is equivalent to *(p++), incrementing the pointer. (*p)++ explicitly increments the value.

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Pointers