Which function is safe to use for string concatenation with size limiting?

The correct answer is B: strncat(). strncat() allows specifying maximum characters to concatenate, preventing buffer overflow. strcat() has no size limit.

Which of the following correctly demonstrates a typedef for a structure?

The correct answer is A: typedef struct { int x; int y; } Point;. The correct syntax for typedef struct is: typedef struct { members } StructName;

Which approach correctly implements a function returning multiple values?

The correct answer is D: A and B are both correct approaches. Both approaches are valid in C: returning a struct with multiple fields or using pointers as output parameters. Using globals is possible but not recommended.

Which of the following is NOT a valid control flow statement in C?

The correct answer is B: foreach. foreach is not a standard C control flow statement. C has if-else, switch, for, while, do-while, and goto.

Which control flow structure allows execution of code only if a certain condition is met?

The correct answer is B: if statement. The if statement executes a block of code conditionally. Loops repeat code, and switch cases are for multi-way branching based on a single expression.

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C Programming
Dynamic Memory

C language from basics to advanced placement prep

25 Q 10 Topics Take Mock Test

Difficulty: All Easy Medium Hard 21–25 of 25

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 Dynamic Memory

Which header file must be included to use malloc(), calloc(), and free() functions?

A #include

B #include

C #include

D #include

Correct Answer: B. #include

EXPLANATION

All memory allocation and deallocation functions are declared in <stdlib.h>.

Test

Q.22 Easy Dynamic Memory

How much memory is allocated by malloc(sizeof(int) * 10) on a 32-bit system where sizeof(int) = 4?

A 10 bytes

B 40 bytes

C 4 bytes

D 44 bytes

Correct Answer: B. 40 bytes

EXPLANATION

sizeof(int) * 10 = 4 * 10 = 40 bytes on a 32-bit system.

Test

Q.23 Easy Dynamic Memory

Which function is used to free dynamically allocated memory?

A delete()

B release()

C free()

D unalloc()

Correct Answer: C. free()

EXPLANATION

free() is the standard function to deallocate memory previously allocated by malloc(), calloc(), or realloc().

Test

Q.24 Easy Dynamic Memory

What does calloc() do differently from malloc()?

A Allocates more memory

B Initializes memory to zero

C Allocates memory faster

D Returns integer instead of void pointer

Correct Answer: B. Initializes memory to zero

EXPLANATION

calloc() takes two arguments (number of elements and size) and initializes all allocated bytes to zero, unlike malloc().

Test

Q.25 Easy Dynamic Memory

Which header file is required for dynamic memory allocation functions?

Correct Answer: B.

EXPLANATION

The <stdlib.h> header file contains declarations for malloc(), calloc(), realloc(), and free() functions.

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C Programming
Dynamic Memory