ILP C++ Quiz Prelims 2

1. A class which can have only one instance at any time is called as ------------

Abstract

Singleton

Void class

None of the above

2. Int main() { int a[20]={1,2,3}; cout<<a++; return 0; }

2

Address of a

Compilation error

Address of a+1

3. What is the output of the follwing code int a=5,*p=&a; *p++; cout<<a<<"\t"<<*p<<endl; *++p; cout<<a<<"\t"<<*p<<endl;

5, 5, 6, 6

5, Garbage Value, 5, Garbage Value

5, 5, 5, Garbage value

Garbage Value, 5, 6, Garbage Value

4. If you use same variable for two getline statements

Both the inputs are stored in that variable

The second input overwrites the first one

The second input attempt fails since the variable already got its value

You can not use same variable for two getline statements

5. Class ConstructTest { public: ConstructTest() { cout<<"Constructor"; } ~ConstructTest() { cout<<"Destructor"; } }; int main() { ConstructTest c[2]; return 0; }

ConstructorDestructorDestructor

ConstructorConstructorDestructor

ConstructorConstructorDestructorDestructor

ConstructorDestructorConstructorDestructor

6. What is the output of the following code snippet ? class VirtualClass { int x,y; public: VirtualClass() { x=1,y=2; } virtual void operator<<(ostream&); }; //end of class void VirtualClass::operator<<(ostream &os) { os<<this->x<<"\t"<<this->y; } int main() { VirtualClass vcObj; vcObj<<cout; return 0; }

2 1

Error

1 2

No output

7. The base class of runtime_error is __________

Runtime class

Exception_handler class

Exception class

Virtual base class

8. int main() { char s[]="welcome", *p=s; cout<<p+p[1]-p[3]; return 0; }

Welcome

Come

Error

Lcome

9. Int main() { int n1=10,n2=2,k,*p1,*p2; p1=&n1,p2=&n2; k=*p1/*p2; cout<<k; return 0; }

5

Error

Division cannot be done over pointers

10

10. Which function helps to extract the string "is left" from the string "23.5 is left"

Atof()

Strtod()

Atod()

None

11. Class mybase{ }; class myclass : public mybase{ }; myclass m1; int main() { mybase *b1 = new myclass(); cout << "object m1 is of type " << typeid(b1).name(); }

Object m1 is of type myclass

Object m1 is of type mybase

Object m1 is of type P6mybase

Object m1 is of type P6myclass

12. What is the output of the following code snippet ? class Test { public: Test(int x) { cout<<"Param Construcor"; } }; //end of class int main() { Test t1=100; return 0; }

Compilation Error

No Ouput

Param Constructor

None of the above