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Test: Pointers - 1 - Back-End Programming MCQ


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10 Questions MCQ Test - Test: Pointers - 1

Test: Pointers - 1 for Back-End Programming 2024 is part of Back-End Programming preparation. The Test: Pointers - 1 questions and answers have been prepared according to the Back-End Programming exam syllabus.The Test: Pointers - 1 MCQs are made for Back-End Programming 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Pointers - 1 below.
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Test: Pointers - 1 - Question 1

What does the following statement mean?

     int (*fp)(char*)

Detailed Solution for Test: Pointers - 1 - Question 1

Pointer to function taking a char* argument and returns an int

Test: Pointers - 1 - Question 2

If a variable is a pointer to a structure, then which of the following operator is used to access data members of the structure through the pointer variable?

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Test: Pointers - 1 - Question 3

Predict the output of following C++ program.
#include<iostream>
using namespace std;
 
class Test
{
private:
  int x;
public:
  Test(int x = 0) { this->x = x; }
  void change(Test *t) { this = t; }
  void print() { cout << "x = " << x << endl; }
};
 
int main()
{
  Test obj(5);
  Test *ptr = new Test (10);
  obj.change(ptr);
  obj.print();
  return 0;
}

Detailed Solution for Test: Pointers - 1 - Question 3

this is a const pointer, so there is an error in line "this = t;"

Test: Pointers - 1 - Question 4

Which one of the following is not a possible state for a pointer?

Detailed Solution for Test: Pointers - 1 - Question 4

A pointer can be in only 3 states a,b and c.

Test: Pointers - 1 - Question 5

What the following, instruction tells?
const int *ptr;

Test: Pointers - 1 - Question 6

Which of the following is true about this pointer?

Detailed Solution for Test: Pointers - 1 - Question 6

The ‘this’ pointer is passed as a hidden argument to all non-static member function calls and is available as a local variable within the body of all non-static functions. ‘this’ pointer is a constant pointer that holds the memory address of the current object. ‘this’ pointer is not available in static member functions as static member functions can be called without any object (with class name).

Test: Pointers - 1 - Question 7

What is the output of this program?

#include < iostream >
using namespace std;
int main()
{
int a = 5, b = 10, c = 15;
int *arr[ ] = {&a, &b, &c};
cout << arr[1];
return 0;
}

Detailed Solution for Test: Pointers - 1 - Question 7

Array element cannot be address of auto variable. It can be address of static or extern variables.

Test: Pointers - 1 - Question 8

What will be the output of the following program code?
#include<stdio.h>
int main()
{
          int i = 10;
          void *p = &i;
          printf("%f\n", *(float *)p);
    return 0;
}

Test: Pointers - 1 - Question 9

Predict the output of following C++ program?
#include<iostream>
using namespace std;
 
class Test
{
private:
  int x;
public:
  Test() {x = 0;}
  void destroy()  { delete this; }
  void print() { cout << "x = " << x; }
};
 
int main()
{
  Test obj;
  obj.destroy();
  obj.print();
  return 0;
}

Detailed Solution for Test: Pointers - 1 - Question 9

delete operator works only for objects allocated using operator new. If the object is created using new, then we can do delete this, otherwise behavior is undefined. See “delete this” in C++ for more examples.

Test: Pointers - 1 - Question 10

What is the output of this program?

#include < iostream >

using namespace std;

int main()

{

char *ptr;

char Str[] = "abcdefg";

ptr = Str;

ptr += 5;

cout << ptr;

return 0;

}

Detailed Solution for Test: Pointers - 1 - Question 10

Pointer ptr points to string ‘fg’. So it prints fg.

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