C++ Functions MCQ (MULTIPLE CHOICE QUESTIONS)

We have already covered C++ Pointer to void questions in the last set of MCQs. There, we have discussed some good questions. This set of MCQ(multiple choice questions focuses) on the C++ Functions questions.

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C++ MCQ | FUNCTIONS

NOTE: You can check your answer immediately by selecting an option. Moreover, this set of C++ Functions MCQ consists of 35 questions.

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C++ Functions MCQ Questions

#1. If an argument to a function is declared as const, then _____.

function can modify the argument.

Function can’t modify the argument.

const argument to a function is not possible.

None of these

#2. What we will not do with function pointers?

allocation of memory

de-allocation of memory

both a & b

none of the mentioned

#3. Which of the following is used to terminate the function declaration?

)

;

]

#4. What are mandatory parts in the function declaration?

return type, function name

return type, function name, parameters

parameters, function name

parameters, variables

#5. Which of the following feature is used in function overloading and function with default argument?

Encapsulation

Polymorphism

Abstraction

Modularity

#6. What is the scope of the variable declared in the user defined function?

whole program

only inside the {} block

None of the mentioned

header section

#7. Where does the return statement returns the execution of the program?

main function

caller function

same function

none of the mentioned

#8. What will happen while using pass by reference

The values of those variables are passed to the function so that it can manipulate them

The location of variable in memory is passed to the function so that it can use the same memory area for its processing

The function declaration should contain ampersand (& in its type declaration)

All of the mentioned

#9. An inline function is expanded during _________

compile-time

run-time

never expanded

end of the program

#10. What happens to a function defined inside a class without any complex operations (like looping, a large number of lines, etc)?

It becomes a virtual function of the class

It becomes a default calling function of the class

It becomes an inline function of the class

The program gives an error

#11. A friend function does not have 'this' pointer associated with it.

True

False

#12. Which of the following function / types of function cannot have default parameters?

Member function of class

Main()

Member function of structure

None

#13. Which is used to keep the call by reference value as intact?

static

const

absolute

none of the mentioned

#14. Which is more effective while calling the functions?

call by value

call by reference

call by pointer

call by object

#15. In which of the following cases inline functions may not word?
i) If the function has static variables.
ii) If the function has global and register variables.
iii) If the function contains loops
iv) If the function is recursive

i, iv

iii, iv

ii, iii, iv

i, iii, iv

#16. What will happen when we use void in argument passing?

It will not return value to its caller

It will return value to its caller

both a & b are correct

none of the mentioned

#17. When our function doesn’t need to return anything means what we will pass as parameter in function?

void

blank space

both

none

#18. How many minimum number of functions should be present in a C++ program for its execution?

#19. What are the advantages of passing arguments by reference?

Changes to parameter values within the function also affect the original arguments.

There is need to copy parameter values (i.e. less memory used)

There is no need to call constructors for parameters (i.e. faster)

All of the mentioned

#20. Which of the following statement is correct?

Only one parameter of a function can be a default parameter.

Minimum one parameter of a function must be a default parameter.

All the parameters of a function can be default parameters.

No parameter of a function can be default.

#21. What is an inline function?

A function that is expanded at each call during execution

A function that is called during compile time

A function that is not checked for syntax errors

A function that is not checked for semantic analysis

#22. Which of the following is the default return value of functions in C++?

int

char

float

void

#23. Default values for a function are specified when ____ .

function is defined

function is declared

Both a and b

None of these

#24. In C++ code , variables can be passed to a function by

Pass by value

Pass by reference

Pass by pointer

All the above

#25. When will we use the function overloading?

same function name but different number of arguments

different function name but same number of arguments

same function name but same number of arguments

different function name but different number of arguments

#26. Assigning one or more function body to the same name is called ___.

Function Overriding

Function Overloading

Both

None

#27. If an argument from the parameter list of a function is defined constant then ________

It can be modified inside the function

It cannot be modified inside the function

Error occurs

Segmentation fault

#28. What is the output of this program?

#include < iostream >
using namespace std;
void fun(int x, int y)
{
   x = 20;
   y = 10;
}
int main()
{
   int x = 10;
   fun(x, x);
   cout << x;
   return 0;
}

compile time error

#29. Where does the execution of the program starts?

user-defined function

main function

void function

else function

#30. Overloaded functions are

Very long functions that can hardly run

One function containing another one or more functions inside it

Two or more functions with the same name but different number of parameters or type

none of the mentioned

#31. Correct way to declare pure virtual function in a C++ class is

Virtual void foo() =0 ;

Void virtual foo()= { 0 }

Virtual void foo() {} = 0;

None of the above

#32. How many can max number of arguments present in function in the c99 compiler?

102

127

#33. Where should default parameters appear in a function prototype?

To the rightmost side of the parameter list

To the leftmost side of the parameter list

Anywhere inside the parameter list

Middle of the parameter list

#34. When we define the default values for a function?

When a function is defined

When a function is declared

When the scope of the function is over

When a function is called

#35. Which of the following best defines the syntax for template function ?

Template

Template return_type Function_Name(Parameters)

Both a and b

None of these

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C++ Functions MCQ Questions

#1. If an argument to a function is declared as const, then _____.

#2. What we will not do with function pointers?

#3. Which of the following is used to terminate the function declaration?

#4. What are mandatory parts in the function declaration?

#5. Which of the following feature is used in function overloading and function with default argument?

#6. What is the scope of the variable declared in the user defined function?

#7. Where does the return statement returns the execution of the program?

#8. What will happen while using pass by reference

#9. An inline function is expanded during _________

#10. What happens to a function defined inside a class without any complex operations (like looping, a large number of lines, etc)?

#11. A friend function does not have 'this' pointer associated with it.

#12. Which of the following function / types of function cannot have default parameters?

#13. Which is used to keep the call by reference value as intact?

#14. Which is more effective while calling the functions?

#15. In which of the following cases inline functions may not word? i) If the function has static variables. ii) If the function has global and register variables. iii) If the function contains loops iv) If the function is recursive

#16. What will happen when we use void in argument passing?

#17. When our function doesn’t need to return anything means what we will pass as parameter in function?

#18. How many minimum number of functions should be present in a C++ program for its execution?

#19. What are the advantages of passing arguments by reference?

#20. Which of the following statement is correct?

#21. What is an inline function?

#22. Which of the following is the default return value of functions in C++?

#23. Default values for a function are specified when ____ .

#24. In C++ code , variables can be passed to a function by

#25. When will we use the function overloading?

#26. Assigning one or more function body to the same name is called ___.

#27. If an argument from the parameter list of a function is defined constant then ________

#28. What is the output of this program? #include < iostream > using namespace std; void fun(int x, int y) { x = 20; y = 10; } int main() { int x = 10; fun(x, x); cout << x; return 0; }

#29. Where does the execution of the program starts?

#30. Overloaded functions are

#31. Correct way to declare pure virtual function in a C++ class is

#32. How many can max number of arguments present in function in the c99 compiler?

#33. Where should default parameters appear in a function prototype?

#34. When we define the default values for a function?

#35. Which of the following best defines the syntax for template function ?

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#15. In which of the following cases inline functions may not word?
i) If the function has static variables.
ii) If the function has global and register variables.
iii) If the function contains loops
iv) If the function is recursive

#28. What is the output of this program?

#include < iostream >
using namespace std;
void fun(int x, int y)
{
x = 20;
y = 10;
}
int main()
{
int x = 10;
fun(x, x);
cout << x;
return 0;
}