In a file opened in "a+" mode, where does the file pointer initially point?

The correct answer is B: End of file. In append mode "a" or "a+", file pointer initially points to end of file for writing. For reading in "a+", you must explicitly seek to read from start.

What will this code do? int i = 0; while(i < 5) { printf("%d ", i++); if(i == 3) break; }

The correct answer is A: Prints: 0 1 2. Post-increment: prints 0 (i becomes 1), prints 1 (i becomes 2), prints 2 (i becomes 3). When i==3, break executes. Output: 0 1 2

What is the output? int arr[] = {10, 20, 30}; int *p = arr; printf("%d", sizeof(p));

The correct answer is B: 8 or 4 depending on system. p is a pointer, so sizeof(p) returns pointer size (8 bytes on 64-bit, 4 on 32-bit), not array size.

Which of the following correctly demonstrates function recursion termination?

The correct answer is B: A recursive function must have a base case to prevent infinite recursion. A base case is essential in recursive functions to provide a stopping condition. Without it, the function will cause stack overflow. The base case ensures recursion terminates properly.

What is the output? int arr[] = {10, 20, 30, 40}; int *p = arr; printf("%d", p[2]);

The correct answer is C: 30. p points to arr[0]. p[2] is equivalent to *(p+2), which points to arr[2] = 30.

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C Programming
Functions

C language from basics to advanced placement prep

28 Q 10 Topics Take Mock Test

Difficulty: All Easy Medium Hard 21–28 of 28

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 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.22 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.23 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.24 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.25 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.26 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.27 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.28 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.

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