Inline Function MCQs – C++

1. What is the primary purpose of an inline function in C++?
(A) Reduce function call overhead
(B) Reduce memory usage
(C) Improve readability
(D) Prevent recursion

2. Which keyword is used to declare an inline function?
(A) static
(B) const
(C) inline
(D) virtual

3. Which of the following is a valid inline function?
(A) inline int sum(int a, int b) { return a + b; }
(B) int inline sum(int a, int b) { return a + b; }
(C) sum inline int(int a, int b) { return a + b; }
(D) static inline sum(int a, int b) { return a + b; }

4. Can a recursive function be declared inline?
(A) Yes, always
(B) No, never
(C) Only for single recursion
(D) It depends on compiler

5. Which statement is true about inline functions?
(A) Inline functions are always faster than normal functions
(B) Inline is only a request; compiler may ignore it
(C) Inline functions cannot have parameters
(D) Inline functions cannot return a value

6. Output of this code?
inline int add(int a, int b) { return a+b; }
int main() { cout << add(2,3); }
(A) 2
(B) 3
(C) 5
(D) Compilation error

7. Which of the following is NOT a suitable candidate for an inline function?
(A) Very small functions
(B) Functions with loops
(C) Functions with a single return statement
(D) Accessor functions in classes

8. Can inline functions be defined inside a class?
(A) Yes
(B) No
(C) Only if static
(D) Only if friend

9. Which of the following is correct for inline function definition outside class?
(A) inline int MyClass::func() { return 1; }
(B) int inline MyClass::func() { return 1; }
(C) MyClass::func inline int() { return 1; }
(D) static inline MyClass::func() { return 1; }

10. What is the maximum number of statements recommended in an inline function?
(A) 1
(B) 2–5
(C) 10
(D) No strict limit

11. Can inline functions be overloaded?
(A) Yes
(B) No
(C) Only in templates
(D) Only if return type differs

12. Can inline functions have static variables inside?
(A) Only if global
(B) No
(C) Only if const
(D) Yes

13. Which of the following statements is true?
(A) Inline functions are expanded at compile time
(B) Inline functions are expanded at runtime
(C) Inline functions cannot call other functions
(D) Inline functions must not return a value

14. Output of this code?
inline int sq(int x) { return x*x; }
int main() { cout << sq(4); }
(A) 2
(B) 4
(C) 8
(D) 16

15. Can an inline function be recursive and still inline?
(A) Yes, all recursive calls are inlined
(B) No, recursion prevents inlining
(C) Only if compiler supports
(D) Inline is ignored for recursion

16. Which of the following is a drawback of inline functions?
(A) Slower execution
(B) Code bloat if function is large
(C) Cannot be used with templates
(D) Cannot return a value

17. Is it necessary to define the inline function before it is called?
(A) Yes
(B) No
(C) Only for templates
(D) Only if global

18. Which of the following cannot be inline?
(A) Member function defined inside class
(B) Function with loop
(C) Const function
(D) Function returning value

19. Output?
inline int f(int a) { return a+1; }
int main() { int x = f(5); cout << x; }
(A) 5
(B) 6
(C) Compilation error
(D) Garbage

20. Which statement is true regarding inline function and compiler?
(A) Compiler always enforces inline
(B) Compiler may ignore inline request
(C) Inline functions cannot be optimized
(D) Inline functions are always recursive