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100 MCQ on C++ Programming

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Question: 60

How many times 'its a while loop' should be printed?

int main()
{
int i = 1 ;
i = i - 1 ;

while(i)
{
    cout<<"its a while loop";
    i++ ;
}

return 0;
}

(A) 1
(B) 2
(C) 0
(D) Infinite Times

Compiler
Level: ExpertCategory: loops
[Posted by: Admin | Chicago, USA]

Question: 61

int main() 
{
int i=0,x=0;

for(i=1;i<10;i*=2)
{
    x++;
    cout<<x;
}
cout<<x;

return 0;
}

(A) 1234567899
(B) 12345678910
(C) 123455
(D) 12344

Compiler
Level: ExpertCategory: loops
[Posted by: Admin | Chicago, USA]

Question: 62

What should be printed on screen?

int main() 
{
int x = 5;

if(x++ == 5)
cout<<"Five"<<endl;
else
if(++x == 6)
cout<<"Six"<<endl;

return 0;
}

(A) FiveSix
(B) Five
(C) Six
(D) None of these

Compiler
Level: PractitionerCategory: conditional
[Posted by: Admin | Chicago, USA]

Question: 63

Find the output of below program:-

int main() 
{
int i = 0, x = 0;

do
{
    if(i % 5 == 0)
    {
       cout<<x;
       x++;
    }

    ++i;
}while(i<10);

cout<<x;

return 0;
}

(A) 01
(B) 012
(C) 0
(D) 0123

Compiler
Level: PractitionerCategory: loops
[Posted by: Admin | Chicago, USA]

Question: 64

What should be output of below program
if use enter a = 5?

int main()
{
    int a;
    cin>>a; // user can enter any value
    
	if (++a*5 <= 25)
	{
	    cout<<"Hello";
	}
	else
	{
	    cout<<"Bye";	
	}

}

(A) Hello
(B) Bye
(C) Undefined
(D) Compilation Error

Compiler
Level: PractitionerCategory: conditional
[Posted by: Admin | Chicago, USA]

Question: 65

Comma(,) is the operator which has least precdence among all operator.

(A) Yes
(B) No

Compiler
Level: BeginnerCategory: loops
[Posted by: Admin | Chicago, USA]

Question: 66

Which operator has more precedence among the following?

*
++
+
-

(A) *
(B) ++
(C) +
(D) -

Compiler
Level: BeginnerCategory: operators
[Posted by: Admin | Chicago, USA]

Question: 67

What is Self Referencial Structure?

(A) Structure which contains pointers
(B) Structure which has pointer to itself
(C) Structure which contains another structure
(D) None of these

Compiler
Level: PractitionerCategory: structure
[Posted by: Admin | Chicago, USA]

Question: 68

Which one is more faster?
A - #include <iostream.h>
B - #include "iostream.h"

(A) A
(B) B
(C) Both has are same
(D) Depends on Compiler

Compiler
Level: PractitionerCategory: other
[Posted by: Admin | Chicago, USA]

Question: 69

What is Singleton class?

(A) We can create n number of object
(B) We can create max 256 objects
(C) We can create 1 object
(D) We cant create object

Compiler
Level: PractitionerCategory: classesAndobjects
[Posted by: Admin | Chicago, USA]

Question: 70

From which STL we can insert/remove data
from anywhere?

(A) Vector
(B) Deque
(C) Stack
(D) List

Compiler
Level: PractitionerCategory: stl
[Posted by: Admin | Chicago, USA]

Question: 71

Which data structure is used by Map?

(A) AVL Tree
(B) Binary Tree
(C) Balance Binary Tree
(D) None of these

Compiler
Level: PractitionerCategory: stl
[Posted by: Admin | Chicago, USA]

Question: 72

Is duplicate data allowed in set?

(A) Yes
(B) No

Compiler
Level: PractitionerCategory: stl
[Posted by: Admin | Chicago, USA]

Question: 73

Can we have constructor as Virtual?

(A) Yes
(B) No

Compiler
Level: PractitionerCategory: virtual_func
[Posted by: Admin | Chicago, USA]

Question: 74

Can we have Pure Virtual Destructor?

(A) Yes
(B) No

Compiler
Level: PractitionerCategory: virtual_func
[Posted by: Admin | Chicago, USA]

Question: 75

If a class(has one virtual function) has 5 Objects then how many Vtable it  will have?

(A) 5
(B) 1
(C) 0
(D) Depends on Compiler

Compiler
Level: ExpertCategory: vtable
[Posted by: Admin | Chicago, USA]

Question: 76

Is it mandatory to override virtual function
in Derived class?

(A) Yes
(B) No

Compiler
Level: PractitionerCategory: virtual_func
[Posted by: Admin | Chicago, USA]

Question: 77

Can we call virtual function using object?

(A) Yes
(B) No

Compiler
Level: ExpertCategory: function
[Posted by: Admin | Chicago, USA]

Question: 78

Can we have pure Virtual Destructor?

(A) Yes
(B) No
(C) Depends on compiler

Compiler
Level: PractitionerCategory: virtual_func
[Posted by: Admin | Chicago, USA]

Question: 79

Can we have Virtual Destructor ?

(A) Yes
(B) No

Compiler
Level: PractitionerCategory: virtual_func
[Posted by: Admin | Chicago, USA]

Question: 80

What is dangling pointer?

(A) A pointer pointing to NULL
(B) Pointer pointing to memory location which has been freed
(C) Pointer which is pointing to new location
(D) None of these

Compiler
Level: PractitionerCategory: pointers
[Posted by: Admin | Chicago, USA]

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