What does the ## operator in preprocessor do?

The correct answer is B: Token pasting. The ## operator concatenates two tokens into one. For example, #define CONCAT(a,b) a##b creates CONCAT(hello, world) → helloworld.

What is the maximum size of a string that can be stored in char str[50]?

The correct answer is A: 49 characters plus null terminator. A char array of size 50 can store maximum 49 characters because the last position is reserved for the null terminator '\0'.

For storing variable-length strings dynamically in a competitive program, what's the safest approach?

The correct answer is A: Allocate strlen(s)+1 bytes to include null terminator. Strings in C are null-terminated, so allocating strlen(s)+1 bytes ensures space for the null terminator. This is the standard safe approach.

What will be printed? char *str = "Hello"; printf("%c", str[1]);

The correct answer is B: e. str[1] accesses the second character of the string, which is 'e'.

What is the output? #define STR(x) #x printf("%s", STR(hello));

The correct answer is A: hello. The # operator (stringification) converts the macro argument into a string literal. STR(hello) becomes "hello" as a string.

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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 191–200 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.191 Easy Functions

What is the output of: int add(int a, int b) { int result = a + b; return result; } If called as add(5, 3)?

A 8

B 5

C 3

D Undefined

Correct Answer: A. 8

EXPLANATION

The function simply adds two integers and returns their sum, which is 5 + 3 = 8.

Test

Q.192 Easy Functions

Consider: int func(int x) { return ++x; } What is the difference if we use x++ instead of ++x?

A No difference in return value

B ++x returns x+1, x++ returns original x

C x++ is faster than ++x

D Depends on compiler optimization

Correct Answer: B. ++x returns x+1, x++ returns original x

EXPLANATION

Pre-increment (++x) increments and returns the new value, while post-increment (x++) increments but returns the old value.

Test

Q.193 Easy Functions

Which keyword is used to create a function that can be expanded inline by the compiler without actual function call overhead?

A extern

B static

C inline

D register

Correct Answer: C. inline

EXPLANATION

The 'inline' keyword (introduced in C99) suggests to the compiler to replace function calls with actual code, reducing call overhead.

Test

Q.194 Easy Functions

What is the scope of a function parameter in C?

A Global scope

B File scope

C Function scope

D Block scope

Correct Answer: C. Function scope

EXPLANATION

Function parameters have function scope, meaning they are accessible throughout the entire function body.

Test

Q.195 Easy Functions

What is the return type of the strlen() function in C?

A int

B size_t

C char*

D void

Correct Answer: B. size_t

EXPLANATION

strlen() returns size_t, which is an unsigned integer type used to represent sizes and counts in C.

Test

Q.196 Easy Functions

How many times can a function be called in a C program?

A Only once

B Maximum 10 times

C Unlimited times

D Maximum 100 times

Correct Answer: C. Unlimited times

EXPLANATION

A function can be called as many times as needed within a program, limited only by memory and stack constraints.

Test

Q.197 Easy Functions

What will be the output of the following code?
int func(int x) { return x * 2; }
int main() { printf("%d", func(5)); }

A 5

B 10

C 20

D Error

Correct Answer: B. 10

EXPLANATION

func(5) returns 5 * 2 = 10, which is then printed.

Test

Q.198 Easy Functions

Which of the following is a correct function declaration?

A int add(int a, int b);

B add int(a, b);

C int add a, b;

D add(int a, int b) int;

Correct Answer: A. int add(int a, int b);

EXPLANATION

Function declaration syntax is: return_type function_name(parameter_list);

Test

Q.199 Easy Functions

Which keyword is used to define a function in C?

A function

B def

C No keyword needed, just return type and name

D func

Correct Answer: C. No keyword needed, just return type and name

EXPLANATION

In C, functions are defined by specifying the return type followed by the function name and parameters. No specific 'function' keyword is used.

Test

Q.200 Easy Functions

What is the primary purpose of using functions in C programming?

A To modularize code and improve reusability

B To increase memory consumption

C To slow down program execution

D To eliminate the need for loops

Correct Answer: A. To modularize code and improve reusability

EXPLANATION

Functions allow code reusability, modularity, and easier maintenance. They break down complex problems into smaller, manageable pieces.

Test

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