Free Test Default arguments – C++ Lan...

Q1: What is a default argument in C++?

A. A value provided in function definition used if no argument is passed B. A mandatory argument for all function calls C. A keyword to declare functions D. A special pointer type

Q2: Where are default arguments specified in C++?

A. In function declaration B. In function definition C. Both declaration and definition D. Outside the function

Q3: Can default arguments be changed at the call site?

A. Yes, if explicitly passed B. No, they are fixed C. Yes, automatically D. No, only inside function

Q4: Which of the following is correct to declare a default argument?

A. void func(int a=10); B. void func(int a); C. void func(int=10 a); D. void func(a=10 int);

Q5: What happens if default arguments are omitted in the middle of parameter list?

A. Compilation error B. Defaults fill automatically C. Last argument is set as default D. Function works normally

Q6: How are default arguments handled in overloaded functions?

A. They cannot be used together B. Defaults apply per function signature C. Defaults cause ambiguity D. Defaults must be same for all overloads

Q7: What is true about default arguments and function pointers?

A. Function pointers ignore default arguments B. Function pointers use default arguments C. Default arguments cause errors with pointers D. Function pointers must specify defaults

Q8: Can you provide default arguments in both declaration and definition?

A. Yes, but only once is used B. Yes, and both are used C. No, only declaration or definition D. No, never

Q9: Which function call uses default argument?

A. func(5) B. func() C. func(3, 7) D. func(10, 20, 30)

Q10: What will happen if a default argument is provided for a non-trailing parameter?

A. Compilation error B. Default is ignored C. Function works normally D. Warning is generated

Q11: Can default arguments be expressions?

A. Yes, any constant or expression B. No, only literals C. No, only variables D. Yes, but only simple math

Q12: Are default arguments considered during function overload resolution?

A. Yes B. No C. Sometimes D. Only if ambiguous

Q13: Which keyword is used to specify default arguments?

A. No keyword; just assignment in declaration B. default C. def D. arg

Q14: What is the output of: void func(int a=5) { cout << a; } func(); ?

A. 5 B. 0 C. Compilation error D. Undefined

Q15: Can you have a default argument for a reference parameter?

A. Yes B. No C. Only if const D. Only if pointer

Q16: What is a potential risk of using default arguments?

A. Unexpected parameter values if caller omits arguments B. Function becomes slower C. Memory leak D. Syntax errors

Q17: How many default arguments can a function have?

A. Any number, but they must be trailing B. Only one C. Two D. None

Q18: Can default arguments be of different types?

A. Yes, each parameter can have a default of any compatible type B. No, all defaults must be same type C. Only integer defaults allowed D. Only string defaults allowed

Q19: Which is true about default arguments and templates?

A. Templates can have default arguments B. Templates cannot use default arguments C. Templates require explicit arguments D. Templates use special default syntax

Q20: How do default arguments affect backward compatibility?

A. They help by allowing old calls to work without new parameters B. They break compatibility C. They are ignored in older versions D. They cause runtime errors

Quiz for Default arguments