C++ Level 1

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Name

Email

Phone

Qualification

1.

What will be the output of the following C++ program?

#include
#include
using namespace std;
int main()
{
cout << setprecision(17);
double d = 0.1;
cout << d << endl;
return 0;
}

0.10000000000000001

0.100001

0.11

compile time error

2.

What will be the output of the following C++ program?

#include

using namespace std;

int main(int argc, char const *argv[])

{

const char *a = "Hello\0World";

cout<<a;

return 0;

}

Hello World

Error

World

Hello

3.

Which is more effective while calling the C++ functions?

call by pointer

call by reference

call by value

call by object

4.

What happens if the following program is executed in C and C++?

#include

int main(void)

{
int new = 5;
printf("%d", new);
}

Error in C and successful execution in C++

A successful run in both C and C++

Error in both C and C++

Error in C++ and successful execution in C

5.

Which of the following is not a type of Constructor in C++?

Default constructor

Copy constructor

Friend constructor

Parameterized constructor

6.

What is the size of wchar_t in C++?

4

2 or 4

Based on the number of bits in the system

2

7.

Which of the following approach is used by C++?

Top-down

Left-right

Bottom-up

Right-left

8.

What is the value of p in the following C++ code snippet?

#include
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;
}

12

0

2

16

9.

Which of the following is used to terminate the function declaration in C++?

:

;

)

]

10.

What will be the output of the following C++ code?

#include
#include
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;

}

World

Hello World

Error

Hello

11.

What is virtual inheritance in C++?

C++ technique to ensure that a private member of the base class can be accessed somehow

C++ technique to avoid multiple copies of the base class into children/derived class

C++ technique to avoid multiple inheritances of classes

C++ technique to enhance multiple inheritance

12.

What will be the output of the following C++ function?

int main()
{
register int i = 1;
int *ptr = &i;
cout << *ptr;
return 0;
}

1

Compiler error may be possible

0

Runtime error may be possible

13.

Which of the following is correct about this pointer in C++?

this pointer is passed as a hidden argument in all static functions of a class

this pointer is passed as a hidden argument in all static variables of a class

this pointer is passed as a hidden argument in all non-static functions of a class

this pointer is passed as a hidden argument in all the functions of a class

14.

Which of the following user-defined header file extension used in c++?

h

hg

hf

cpp

15.

What is C++?

C++ is an object oriented programming language

C++ is a functional programming language

C++ is a procedural programming language

C++ supports both procedural and object oriented programming language

16.

Which of the following type is provided by C++ but not C?

float

double

bool

int

17.

By default, all the files in C++ are opened in _________ mode.

VTC

ISCII

Binary

Text

18.

Who invented C++?

Bjarne Stroustrup

Dennis Ritchie

Ken Thompson

Brian Kernighan

19.

Which of the following C++ code will give error on compilation?

================code 1=================

#include

using namespace std;

int main(int argc, char const *argv[])

{

cout<<"Hello World";

return 0;

}

========================================

================code 2=================

#include

int main(int argc, char const *argv[])

{

std::cout<<"Hello World";

return 0;

}

========================================

Both code 1 and code 2

Code 2 only

Code 1 only

Neither code 1 nor code 2

20.

Which of the following correctly declares an array in C++?

int array;

array{10};

int array[10];

array array[10];

21.

What will be the output of the following C++ code?

#include
using namespace std;
int main()
{
char c = 74;
cout << c;
return 0;
}

N

I

A

J

22.

What happens if the following program is executed in C and C++?

#include

void func(void)

{

printf("Hello");

}

void main()

{

func();

func(2);

}

Error in C and successful execution in C++

Error in C++ and successful execution in C

Outputs Hello twice in both C and C++

Error in both C and C++

23.

Which of the following is a correct identifier in C++?

$var_name

7VARNAME

VAR_1234

7var_name

24.

What is the difference between delete and delete[] in C++?

delete is used to delete single object whereas delete[] is used to multiple(array/pointer of) objects

delete is syntactically correct but delete[] is wrong and hence will give an error if used in any case

delete is a keyword whereas delete[] is an identifier

delete is used to delete normal objects whereas delete[] is used to pointer objects

25.

What will be the output of the following C++ code?

#include

using namespace std;

int main ()

{

int cin;

cin >> cin;

cout << "cin: " << cin;

return 0;

}

Nothing is printed

cin: garbage value

Segmentation fault

Error

26.

What happens if the following C++ statement is compiled and executed?

int *ptr = NULL;
delete ptr;

The program is not semantically correct

The program gives a compile-time error

The program is compiled and executed successfully

The program compiled successfully but throws an error during run-time

27.

What will be the output of the following C++ code?

#include
#include
#include
using namespace std;
int main()
{
string s = "spaces in text";
s.erase(remove(s.begin(), s.end(), ' ' ), s.end() ) ;
cout << s << endl;
}

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