What are static local variables in functions used for?

The correct answer is A: To store values between function calls. Static local variables retain their value between function calls, initialized only once, and are stored in data segment.

What is the output of this program? for (int i = 1; i

The correct answer is A: 1 2\n 2 4\n 3 6. Nested loops: outer i=1,2,3; inner j=1,2. Prints products: 1*1=1, 1*2=2 (newline), 2*1=2, 2*2=4 (newline), etc.

What will be the output of: int x = 10; printf("%u", -x);

The correct answer is B: 4294967286. When -10 is assigned to an unsigned int format (%u), it gets interpreted as a large positive number due to two's complement representation on a 32-bit system.

What does the expression *(arr + 3) represent for an integer array?

The correct answer is B: Value of 4th element (0-indexed as arr[3]). arr + 3 points to the 4th element (0-indexed). Dereferencing with * gives its value, equivalent to arr[3].

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

The correct answer is B: 10. func(5) returns 5 * 2 = 10, which is then printed.

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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 11–20 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.11 Easy Functions

What is the primary purpose of function prototypes in C?

A To declare the function signature before its definition

B To allocate memory for function variables

C To optimize function execution speed

D To prevent function from being called

Correct Answer: A. To declare the function signature before its definition

EXPLANATION

Function prototypes inform the compiler about function name, return type, and parameters before the actual definition, enabling proper type checking during compilation.

Test

Q.12 Easy Functions

What is the main difference between function declaration and function definition?

A Declaration specifies name and parameters; definition provides implementation

B Declaration includes return type; definition doesn't

C They are exactly the same

D Definition must come before declaration

Correct Answer: A. Declaration specifies name and parameters; definition provides implementation

EXPLANATION

Declaration (prototype) informs compiler about function signature; definition provides the actual implementation body.

Test

Q.13 Easy Functions

Which of the following is an example of call by value in C?

A void func(int *p) { *p = 10; }

B void func(int p) { p = 10; }

C void func(int &p) { p = 10; }

D void func(int arr[]) { arr[0] = 10; }

Correct Answer: B. void func(int p) { p = 10; }

EXPLANATION

Call by value passes a copy of the variable. Changes inside the function don't affect the original variable. Option B demonstrates this principle.

Test

Q.14 Easy Functions

In C, what happens when a function is called before its declaration?

A It executes successfully with default int return type

B Compilation error occurs

C Runtime error occurs

D Function is automatically declared as extern

Correct Answer: B. Compilation error occurs

EXPLANATION

C requires function declaration before use (forward declaration or definition). Calling without prior declaration causes compilation error in modern C standards.

Test

Q.15 Easy Functions

What is the return type of a function that performs an action but doesn't return any value?

A int

B void

C null

D empty

Correct Answer: B. void

EXPLANATION

The void keyword is used as return type for functions that do not return any value.

Test

Q.16 Easy Functions

Which storage class specifier allows a function to be called only within the file where it is defined?

A static

B extern

C auto

D register

Correct Answer: A. static

EXPLANATION

The static keyword restricts function scope to the file in which it is declared, preventing external linkage.

Test

Q.17 Easy Functions

In the context of recursion, which of the following is essential to avoid infinite recursion?

A Using static variables

B A base case that terminates recursion

C Declaring the function as inline

D Using pointers in function parameters

Correct Answer: B. A base case that terminates recursion

EXPLANATION

A base case is essential in recursive functions to provide a termination condition, otherwise the function will recurse infinitely.

Test

Q.18 Easy Functions

What will be the output?
int func(int *p) { return *p; }
int main() { int x = 10; printf("%d", func(&x)); }

A 10

B Address of x

C Garbage value

D Compiler error

Correct Answer: A. 10

EXPLANATION

The function receives a pointer to x, dereferences it with *p, and returns the value 10.

Test

Q.19 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.20 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

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