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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 - Which operator is required to be overloaded as member function only?
Answer : D
Explaination
Overloaded assignment operator does the job similar to copy constructor and is required to be overloaded as member function of the class.
Q 3 - The following operator can be used to calculate the value of one number raised to another.
Answer : D
Explaination
There is no such operator in C/C++.
Answer : B
Explaination
As it is also a character is occupies 1 byte of memory.
Q 5 - What is the full form of RTTI.
A - Runtime type identification
B - Runtime template identification
Answer : A
Explaination
Q 6 - Choose the option not applicable for the constructor.
Answer : C
Explaination
A constructor can’t be overridden.
Q 7 - What is the output of the following program?
#include<iostream>
using namespace std;
main() {
int x = 5;
if(x==5) {
if(x==5) break;
cout<<"Hello";
}
cout<<”Hi”;
}
Answer : A
Explaination
compile error, keyword break can appear only within loop/switch statement.
#include<iostream>
using namespace std;
main() {
int x = 5;
if(x==5) {
if(x==5) break;
cout<<"Hello";
}
cout<<”Hi”;
}
Q 8 - What is the output of the following program?
#include<iostream>
using namespace std;
main() {
union abc {
int x;
char ch;
} var;
var.ch = 'A';
cout<<var.x;
}
Answer : B
Explaination
65, as the union variables share common memory for all its elements, x gets ‘A’ whose ASCII value is 65 and is printed.
#include<iostream>
using namespace std;
main() {
union abc {
int x;
char ch;
} var;
var.ch = 'A';
cout<<var.x;
}
Answer : B
Explaination
g++ is GNU C++ compiler for linux. Borland and vc++ (Microsoft visual c++) for windows.
Q 10 - What is the output of the following program?
#include<iostream>
using namespace std;
void main() {
char *s = "C++";
cout<<s<<" ";
s++;
cout<<s<<" ";
}
Answer : B
Explaination
After s++, s points the string “++”.
#include<iostream>
using namespace std;
void main() {
char *s = "C++";
cout<<s<<" ";
s++;
cout<<s<<" ";
}