What is the correct way to define a multi-line macro in C?

The correct answer is B: #define MULTI printf("Line1") \ printf("Line2"). Backslash (\) at the end of line continues a macro definition to the next line. This is the standard way to create multi-line macros in C.

Consider: int arr[10]; int *ptr = arr; What does ptr[5] represent?

The correct answer is D: Both A and C. ptr[5] is equivalent to *(ptr+5), which accesses the 5th element. Pointer arithmetic adjusts by the size of int.

What is the effect of using multiple break statements in nested loops?

The correct answer is C: Each break terminates its corresponding loop level. Each break statement exits only its immediately enclosing loop. To exit multiple nested loops, you need one break for each level you want to exit.

Consider the preprocessor directive #define MAX 100. If this macro is used in multiple source files, which statement is TRUE?

The correct answer is A: The macro definition will be duplicated in each object file, increasing binary size. Macros are expanded during preprocessing in each translation unit separately. If #define MAX 100 appears in multiple source files, the constant 100 gets substituted in each file independently, potentially creating code duplication. To avoid this, the macro should be defined in a header file with inc

Which scenario is most likely to cause a segmentation fault in dynamic memory?

The correct answer is B: Accessing memory beyond allocated size. Buffer overflow by accessing beyond allocated boundaries causes segmentation fault as it accesses invalid memory pages.

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C Programming

C language from basics to advanced placement prep

291 Q 10 Topics Take Mock Test

Difficulty: All Easy Medium Hard 91–100 of 291

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.91 Easy Structures & Unions

Which of the following statements about structures is TRUE?

A A structure is a collection of variables of the same data type

B A structure is a collection of variables of different data types grouped under a single name

C A structure cannot contain pointers

D A structure occupies memory equal to the sum of its members without any padding

Correct Answer: B. A structure is a collection of variables of different data types grouped under a single name

EXPLANATION

A structure allows grouping of different data types. Padding may be added by the compiler for alignment.

Test

Q.92 Easy Structures & Unions

Which of the following is the correct way to initialize a structure in C?

A struct Point p = {10, 20};

B struct Point p; p = {10, 20};

C Point p = {10, 20};

D p.x = 10; p.y = 20; (without declaration)

Correct Answer: A. struct Point p = {10, 20};

EXPLANATION

Structures must be initialized at declaration time using curly braces. Assignment of initializer list is not valid after declaration.

Test

Q.93 Easy Structures & Unions

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

A typedef struct { int x; int y; } Point;

B struct typedef Point { int x; int y; };

C define struct Point { int x; int y; };

D struct Point typedef { int x; int y; };

Correct Answer: A. typedef struct { int x; int y; } Point;

EXPLANATION

The correct syntax for typedef struct is: typedef struct { members } StructName;

Test

Q.94 Easy Structures & Unions

How do you access a member of a structure through a pointer in C?

A Using dot operator (.)

B Using arrow operator (->)

C Using asterisk (*)

D Using ampersand (&)

Correct Answer: B. Using arrow operator (->)

EXPLANATION

The arrow operator (->) is used to access structure members through a pointer. The dot operator is used with direct variables.

Test

Q.95 Easy Structures & Unions

Consider: union Data { int i; float f; char c; }; What is the size of this union?

A 4 bytes

B 9 bytes

C 5 bytes

D 12 bytes

Correct Answer: A. 4 bytes

EXPLANATION

The size of a union equals the size of its largest member. Here, int is 4 bytes (largest), so union size is 4 bytes.

Test

Q.96 Easy Structures & Unions

Which of the following statements about unions is correct?

A Union members share the same memory location

B Union size equals the sum of all member sizes

C All union members can hold values simultaneously

D Union requires more memory than structure

Correct Answer: A. Union members share the same memory location

EXPLANATION

Union members share the same memory location, and the union size equals the size of its largest member.

Test

Q.97 Easy Structures & Unions

What is the correct way to dynamically allocate an array of structures?
struct Student { int roll; char name[50]; };

A struct Student *arr = (struct Student*)malloc(n * sizeof(struct Student));

B struct Student arr = (struct Student*)malloc(n * sizeof(char));

C struct Student *arr = malloc(n);

D Student *arr = malloc(n * Student);

Correct Answer: A. struct Student *arr = (struct Student*)malloc(n * sizeof(struct Student));

EXPLANATION

Correct allocation requires pointer declaration, proper cast, and multiplying n with sizeof(struct Student).

Test

Q.98 Easy Structures & Unions

When structure is passed by value to a function, which of these is true?

A Changes to structure members inside function affect the original

B The entire structure is copied onto the stack

C Only pointers within the structure are copied

D Memory is shared between function and caller

Correct Answer: B. The entire structure is copied onto the stack

EXPLANATION

Pass by value creates a complete copy of the structure on the function's stack frame.

Test

Q.99 Easy Structures & Unions

Which of the following correctly demonstrates self-referential structure (for linked list)?

A struct Node { int data; struct Node *next; };

B struct Node { int data; Node *next; };

C struct Node { int data; *next; };

D Node { int data; Node *next; };

Correct Answer: A. struct Node { int data; struct Node *next; };

EXPLANATION

In C, self-referential structures require the struct keyword in pointer declarations within the structure definition.

Test

Q.100 Easy Structures & Unions

Which of these is a valid declaration of a structure variable using dot operator immediately after struct definition?

A struct Point { int x; int y; } p;

B struct Point { int x; int y; }; Point p;

C struct { int x; int y; } p;

D Both A and C

Correct Answer: D. Both A and C

EXPLANATION

Both methods are valid - A uses named struct tag with variable declaration, C uses anonymous struct with variable declaration.

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