C++ Programming · all questions

Pointers and References in C++
practice.

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98

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Q21

What is the correct way to pass a pointer to a function in C++?

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Q22

What is a memory leak in C++?

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Q23

What is the purpose of the 'delete' keyword in C++?

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Q24

What does the 'nullptr' keyword signify when used as a pointer value in C++?

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Q25

What is a pointer arithmetic in C++?

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Q26

What is the purpose of the 'this' pointer in C++?

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Q27

What is the output of the following code: char str[] = "Hello"; cout << sizeof(str); in C++?

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Q28

What does the 'sizeof' operator return when used with a pointer variable in C++?

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Q29

What is the purpose of the 'const' keyword in a pointer declaration in C++?

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Q30

What is the output of the following code: int arr[3] = {1, 2, 3}; cout << *(arr + 2); in C++?

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Q31

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

#include <iostream>
using namespace std;
int main()
{
    int  const  p = 5;
    cout << ++p;
    return 0;
}

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Q32

What we can't do on a void pointer?

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Q33

Choose the right option.

string* x, y;

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Q34

What is size of generic pointer in C++ (in 32-bit platform)?

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Q35

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

#include <iostream>
using namespace std;
int main()
{
    int n = 5;
    void *p = &n;
    int *pi = static_cast<int*>(p);
    cout << *pi << endl;
    return 0;
}

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Q36

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

#include <iostream>
#include <string>
#include <cstdlib>
 
using namespace std;
 
int main(int argc, char const *argv[])
{
	int a = 5;
	int &p = a;
	cout<<p;
	return 0;
}

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Q37

The correct statement for a function that takes pointer to a float, a pointer to a pointer to a char and returns a pointer to a pointer to a integer is . . . . . . . .

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Q38

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

#include <iostream>
using namespace std;
void print (char * a)
{
    cout << a << endl;
}
int main ()
{
    const char * a = "Hello world";
    print(const_cast (a) );
    return 0;
}

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Q39

Identify the incorrect statement.

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Q40

Which of the following function must use reference.

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