Quiz on C++ Pointers

1. What will be the output of the following program?

#include <iostream>

using namespace std;

int main()

{

int var = 64, *ptr = &var;

char ch = ‘D’;

*ptr += ch;

cout << var << “, ” << ch << endl;

return 0;

}

1. What will be the output of the following program?

#include <iostream>

using namespace std;

int main()

{

const int i = 20;

const int* const ptr = &i;

cout << i<<” “<< *ptr;

return 0;

}

1. What will be the output of the following program?

#include <iostream>

using namespace std;

int main()

{

const int var = 20;

const int* const ptr = &i;

*ptr++;

cout << i<<” “<< ptr;

return 0;

}

1. What will be the output of the following program?

#include <iostream>

using namespace std;

int main()

{

int num[5];

int* ptr;

ptr = num;

*ptr = 10;

ptr++;

*ptr=*ptr++;

ptr++;

*ptr=*ptr++;

for (int i = 0; i < 5; i++)

cout << num[i] << “, “;

return 0;

}

1. What will be the output of the following program?

#include <iostream>

using namespace std;

int main()

{

int arr[] = { 4, 5, 6, 7 };

int* ptr = (arr + 3);

cout << *ptr + 20;

return 0;

}

1. What will be the output of the following code snippet?

#include <iostream>

using namespace std;

int main()

{

int arr[] = { 4, 5, 6, 7 },*ptr,*ptr1;

ptr=&arr[0];

ptr1=arr[1];

    cout << “a=” << ptr1;

return 0;

}

1. What will be the output of the following program?

#include <iostream>

using namespace std;

int main()

{

int arr[5] = { 1, 2, 3, 4, 5 };

for (int i = 0; i < 5; i++)

cout << *(arr+4-i) << ” “;

return 0;

}

1. What will be the output of the following program?

#include <iostream>

using namespace std;

void fun(int *arr)

{

    for(int i=0;i<5;i++)

    {

    *(arr)=i+*(arr);

    }

}

int main()

{

int arr=6;

fun(&arr);

cout<<arr<<” “;

return 0;

}

1. What will be the output of the following program?

#include <iostream>

using namespace std;

int fun(int *x)

{

    *x=5;

    return *x;

}

int main()

{

int x = 10, y = 15, i;

for (i = 0; i < 1; i++) {

int x = 20, y = 25;

}

int mul = x * y;

fun(&mul);

cout << *(&mul);

return 0;

}

1. Suppose a pointer of type “ptr” is referencing two variables of type integer one after another, where will it get the address of one of them?

What is the size of the pointer variable?

1. When the address of the variable is stored in a pointer, which operator is used to access its value?

To allocate an array of integer pointers dynamically, which of the following syntax is correct?

On pointers, which operation cannot be performed?

Which weakly typed pointer variable is required for explicitly type cast in C++?