Virtual destructors are used for the same purpose as virtual functions. When you remove an object of subclass, which is referenced by a parent class pointer, only destructor of base class will get executed. But if the destructor is defined using virtual keyword, both the destructors [ of parent and sub class ] will get invoked.
What means pass by value?
Which reference modifier is used to define reference variable? a) & b) $ c) # d) none of the mentioned
What does a reference provide? a) Alternate name for the class b) Alternate name for the variable c) Alternate name for the pointer d) none of the mentioned
Identify the correct sentence regarding inequality between reference and pointer. a) we can not create the array of reference. b) we can create the Array of reference. c) we can use reference to reference. d) none of the mentioned
Which value we cannot assign to reference? a) integer b) floating c) unsigned d) null
What is output of this program?
#include <iostream>
using namespace std;
int main()
{
int a = 9;
int & aref = a;
a++;
cout << "The value of a is " << aref;
return 0;
}
a) 9
b) 10
c) error
d) 11What is the output of this program?
#include <iostream>
using namespace std;
void swap(int &a, int &b);
int main()
{
int a = 5, b = 10;
swap(a, b);
cout << "In main " << a << b;
return 0;
}
void swap(int &a, int &b)
{
int temp;
temp = a;
a = b;
b = temp;
cout << "In swap " << a << b;
}
a) In swap 105 In main 105
b) In swap 105 In main 510
c) In swap 510 In main 105
d) none of the mentionedIdentify the incorrect statement a) reference is the alternate name of the object b) A reference value once defined can be reassigned c) A reference value once defined cannot be reassigned d) none of the mentioned
What is output of program?
#include <iostream>
using namespace std;
void print (char * a)
{
cout << a << endl;
}
int main ()
{
const char * a = "Hello world";
print(const_cast<char *> (a) );
return 0;
}
a) Hello world
b) Hello
c) world
d) compile time errorCan you please explain what is class using C++?
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