C++ Programming MCQ Questions with Answers
 |
| C++ Programming MCQ Questions with Answers |
1. Who invented C++?
a) Dennis Ritchie
b) Ken Thompson
c) Brian Kernighan
d) Bjarne Stroustrup
Ans: D
2. What is C++?
a) C++ is an object oriented programming language
b) C++ is a procedural programming language
c) C++ supports both procedural and object oriented programming language
d) C++ is a functional programming language
Ans: C
3. Which of the following is the correct syntax of including a user defined header files in C++?
a) #include [userdefined]
b) #include “userdefined”
c) #include <userdefined.h>
d) #include <userdefined>
Ans: B
4. Which of the following is used for comments in C++?
a) /* comment */
b) // comment */
c) // comment
d) both // comment or /* comment */
Ans: D
5. Which of the following extension is used for user-defined header file in c++?
a) hg
b) cpp
c) h
d) hf
Ans: C
6. Which of the following is a correct identifier in C++?
a) VAR_1234
b) $var_name
c) 7VARNAME
d) 7var_name
Ans: A
7. Which of the following is not a type of Constructor in C++?
a) Default constructor
b) Parameterized constructor
c) Copy constructor
d) Friend constructor
Ans: D
8. Which of the following approach is used by C++?
a) Left-right
b) Right-left
c) Bottom-up
d) Top-down
Ans: C
9. What is virtual inheritance in C++?
a) C++ technique to enhance multiple inheritance
b) C++ technique to ensure that a private member of the base class can be accessed somehow
c) C++ technique to avoid multiple inheritances of classes
d) C++ technique to avoid multiple copies of the base class into children/derived class
Ans: D
10. What happens if the following C++ statement is compiled and executed?
int *ptr = NULL;
delete ptr;
a) The program is not semantically correct
b) The program is compiled and executed successfully
c) The program gives a compile-time error
d) The program compiled successfully but throws an error during run-time
Ans; B
11. What will be the output of the following C++ code?
#include <iostream>
#include <string>
using namespace std;
int main(int argc, char const *argv[])
{
char s1[6] = "Hello";
char s2[6] = "World";
char s3[12] = s1 + " " + s2;
cout<<s3;
return 0;
}
a) Hello
b) World
c) Error
d) Hello World
Ans: C
12. What is the difference between delete and delete[] in C++?
a) delete is syntactically correct but delete[] is wrong and hence will give an error if used in any case
b) delete is used to delete normal objects whereas delete[] is used to pointer objects
c) delete is a keyword whereas delete[] is an identifier
d) delete is used to delete single object whereas delete[] is used to multiple(array/pointer of) objects
Ans: D
13. What happens if the following program is executed in C and C++?
#include <stdio.h>
int main(void)
{
int new = 5;
printf("%d", new);
}
a) Error in C and successful execution in C++
b) Error in both C and C++
c) Error in C++ and successful execution in C
d) A successful run in both C and C++
Ans: C
14. What happens if the following program is executed in C and C++?
#include <stdio.h>
void func(void)
{
printf("Hello");
}
void main()
{
func();
func(2);
}
a) Outputs Hello twice in both C and C++
b) Error in C and successful execution in C++
c) Error in C++ and successful execution in C
d) Error in both C and C++
Ans: D
15. Which of the following is correct about this pointer in C++?
a) this pointer is passed as a hidden argument in all static variables of a class
b) this pointer is passed as a hidden argument in all the functions of a class
c) this pointer is passed as a hidden argument in all non-static functions of a class
d) this pointer is passed as a hidden argument in all static functions of a class
Ans: C
16. What will be the output of the following C++ code?
#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
int main()
{
string s = "spaces in text";
s.erase(remove(s.begin(), s.end(), ' ' ), s.end() ) ;
cout << s << endl;
}
a) spacesintext
b) spaces in text
c) spaces
d) spaces in
Ans: A
17. Which of the following C++ code will give error on compilation?
================code 1=================
#include <iostream>
using namespace std;
int main(int argc, char const *argv[])
{
cout<<"Hello World";
return 0;
}
========================================
================code 2=================
#include <iostream>
int main(int argc, char const *argv[])
{
std::cout<<"Hello World";
return 0;
}
========================================
a) Code 1 only
b) Neither code 1 nor code 2
c) Both code 1 and code 2
d) Code 2 only
Ans: B
18. Which of the following type is provided by C++ but not C?
a) double
b) float
c) int
d) bool
Ans: D
19. What is the value of p in the following C++ code snippet?
#include <iostream>
using namespace std;
int main()
{
int p;
bool a = true;
bool b = false;
int x = 10;
int y = 5;
p = ((x | y) + (a + b));
cout << p;
return 0;
}
a) 12
b) 0
c) 2
d) 16
Ans: D
20. By default, all the files in C++ are opened in _________ mode.
a) Binary
b) VTC
c) Text
d) ISCII
Ans: C
_11zon.png)
_11zon.png)
