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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 - What is the output of the following program?
#include<iostream>
using namespace std;
class abc {
public:
static int x;
int i;
abc() {
i = ++x;
}
};
int abc::x;
main() {
abc m, n, p;
cout<<m.x<<" "<<m.i<<endl;
}
Answer : A
Explaination
The static member variable x shares common memory among all the objects created for the class.
#include<iostream>
using namespace std;
class abc {
public:
static int x;
int i;
abc() {
i = ++x;
}
};
int abc::x;
main() {
abc m, n, p;
cout<<m.x<<" "<<m.i<<endl;
}
Q 2 - A user defined header file is included by following statement in general.
Answer : A
Explaination
With the syntax as in (a) the compiler first looks for the file in the present working directory and then in the default include path if not found.
Q 3 - In the following program f() is overloaded.
void f(int x) {
}
void f(signed x) {
}
main() {
}
Answer : B
Explaination
No, as both the functions signature is same.
Q 4 - How can we make an class act as an interface in C++?
A - By only providing all the functions as virtual functions in the class.
B - Defining the class following with the keyword virtual
Answer : A
Explaination
There are no keywords in C++ such as abstract and interface.
Q 5 - What is the output of the following program?
#include<iostream>
using namespace std;
class Base {
public:
void f() {
cout<<"Base\n";
}
};
class Derived:public Base {
public:
void f() {
cout<<"Derived\n";
};
};
main() {
Derived obj;
obj.Base::f();
}
Answer : A
Explaination
Base object cannot refer to Derived members.
#include<iostream>
using namespace std;
class Base {
public:
void f() {
cout<<"Base\n";
}
};
class Derived:public Base {
public:
void f() {
cout<<"Derived\n";
};
};
main() {
Derived obj;
obj.Base::f();
}
Q 6 - i) single file can be opened by several streams simultaneously.
ii) several files simultaneously can be opened by a single stream
Answer : C
Explaination
Q 7 - i) Exception handling technically provides multi branching.
ii) Exception handling can be mimicked using goto construct.
Answer : A
Explaination
goto just does the unconditional branching.
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];
}
Answer : B
Explaination
g++ is GNU C++ compiler for linux. Borland and vc++ (Microsoft visual c++) for windows.
Q 10 - What is the built in library function to compare two strings?
Answer : B
Explaination
strcmp() is the built in function from string.h to compare two strings. Returns 0 if both are same strings. Returns -1 if first < second string. Returns 1 first > second.