C++ Programming Questions and Answers – Functions

This set of C++ Programming Multiple Choice Questions & Answers (MCQs) focuses on “Functions”.

1. Which of the following is the default return value of functions in C++?
a) int
b) char
c) float
d) void
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2. What happens to a function defined inside a class without any complex operations (like looping, a large number of lines, etc)?
a) It becomes a virtual function of the class
b) It becomes a default calling function of the class
c) It becomes an inline function of the class
d) The program gives an error
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3. What is an inline function?
a) A function that is expanded at each call during execution
b) A function that is called during compile time
c) A function that is not checked for syntax errors
d) A function that is not checked for semantic analysis
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4. An inline function is expanded during ______________
a) compile-time
b) run-time
c) never expanded
d) end of the program
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5. 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
a) i, iv
b) iii, iv
c) ii, iii, iv
d) i, iii, iv
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6. When we define the default values for a function?
a) When a function is defined
b) When a function is declared
c) When the scope of the function is over
d) When a function is called
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7. Where should default parameters appear in a function prototype?
a) To the rightmost side of the parameter list
b) To the leftmost side of the parameter list
c) Anywhere inside the parameter list
d) Middle of the parameter list
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8. If an argument from the parameter list of a function is defined constant then _______________
a) It can be modified inside the function
b) It cannot be modified inside the function
c) Error occurs
d) Segmentation fault
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9. Which of the following feature is used in function overloading and function with default argument?
a) Encapsulation
b) Polymorphism
c) Abstraction
d) Modularity
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10. What will be the output of the following C++ code?

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

a) 10
b) 0
c) Error
d) Segmentation fault
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11. What will be the output of the following C++ code?

#include<iostream>
using namespace std;
 
class Test
{
  protected:
    int x;
  public:
    Test (int i):x(i) { }
    void fun() const  { cout << "fun() const " << endl; }
    void fun()        {  cout << "fun() " << endl;     }
};
 
int main()
{
    Test t1 (10);
    const Test t2 (20);
    t1.fun();
    t2.fun();
    return 0;
}

a)

fun() 
fun() const

b)

fun() const
fun() 

c)

fun() 
fun() 

d)

fun() const
fun() const

12. What will be the output of the following C++ code?

#include <iostream>
using namespace std;
 
int fun(int=0, int = 0);
 
int main()
{
  cout << fun(5);
  return 0;
}
int fun(int x, int y) { return (x+y); }

a) -5
b) 0
c) 10
d) 5
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13. What will be the output of the following C++ code?

#include <iostream>
using namespace std;
void square (int *x, int *y)
{
	*x = (*x) * --(*y);
}
int main ( )
{
	int number = 30;
	square(&number, &number);
	cout << number;
	return 0;
}

a) 870
b) 30
c) Error
d) Segmentation fault
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14. From which function the execution of a C++ program starts?
a) start() function
b) main() function
c) new() function
d) end() function
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15. Which of the following is important in a function?
a) Return type
b) Function name
c) Both return type and function name
d) The return type, function name and parameter list
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Sanfoundry Global Education & Learning Series – C++ Programming Language.

To practice all areas of C++ language, here is complete set of 1000+ Multiple Choice Questions and Answers.