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C++ Online Quiz
Following quiz provides Multiple Choice Questions (MCQs) related to C++ Framework. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.
Q 1 - One of the following is true for an inline function.
A - It executes faster as it is treated as a macro internally
B - It executes faster because it priority is more than normal function
Answer : A
Explaination
As inline function gets expanded at the line of call like a macro it executes faster.
Q 2 - What is the output of the following program?
#include<iostream>
using namespace std;
class abc {
public:
int i;
abc(int i) {
i = i;
}
};
main() {
abc m(5);
cout<<m.i;
}
Answer : B
Explaination
i=i, is assigning member variable to itself.
#include<iostream>
using namespace std;
class abc {
public:
int i;
abc(int i) {
i = i;
}
};
main() {
abc m(5);
cout<<m.i;
}
Q 3 - Pick up the valid declaration for overloading ++ in postfix form where T is the class name.
Answer : B
Explaination
The parameter int is just to signify that it is the postfix form overloaded. Shouldnt return reference as per its original behavior.
Q 4 - What is the output of the following program?
#include<iostream>
using namespace std;
class Base {
public:
virtual void f() {
cout<<"Base\n";
}
};
class Derived:public Base {
public:
void f() {
cout<<"Derived\n";
}
};
main() {
Base *p = new Derived();
p->f();
}
Answer : B
Explaination
The overridden method f() of the created object for derived class gets called.
#include<iostream>
using namespace std;
class Base {
public:
virtual void f() {
cout<<"Base\n";
}
};
class Derived:public Base {
public:
void f() {
cout<<"Derived\n";
}
};
main() {
Base *p = new Derived();
p->f();
}
Q 5 - Objects created using new operator are stored in __ memory.
Answer : B
Explaination
new operator allocates memory dynamically know as Heap/free memory.
Q 7 - What is the outpout of the following program?
#include<iostream>
using namespace std;
main() {
enum {
india, is = 7, GREAT
};
cout<<india<<" "<<GREAT;
}
Answer : C
Explaination
0 8, enums gives the sequence starting with 0. If assigned with a value the sequence continues from the assigned value.
#include<iostream>
using namespace std;
main() {
enum {
india, is = 7, GREAT
};
cout<<india<<" "<<GREAT;
}
Q 8 - What is the output of the following program?
#include<iostream>
using namespace std;
main() {
int a[] = {1, 2}, *p = a;
cout<<p[1];
}
Answer : B
Explaination
as p holds the base address then we can access array using p just like with a
#include<iostream>
using namespace std;
main() {
int a[] = {1, 2}, *p = a;
cout<<p[1];
}
Q 9 - Following is the invalid inclusion of a file to the current program. Identify it
Answer : C
Explaination
option (a) & (b) are valid. There is no such syntax or provision as in option (c).
Q 10 - What is the output of the following program?
#include<iostream>
using namespace std;
main() {
char *s = "Fine";
*s = 'N';
cout<<s<<endl;
}
Answer : D
Explaination
*s=N, trying to change the character at base address to N of a constant string leads to runtime error.
#include<iostream>
using namespace std;
main() {
char *s = "Fine";
*s = 'N';
cout<<s<<endl;
}