5 questions all need to bewritten in c++. --------------------------------------

Question

5 questions all need to bewritten in c++.

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Look at the following code.

int x = 7;

int *iptr = &x;

What will be displayed if you send the expression *iptr to cout? What happens if you send the expression iptr to cout?

Look at the following array definition.

int numbers[] = {2, 4, 6, 8, 10};

What will the following statement display?

cout << *(numbers + 3) << endl;

Look at the following code.

double value = 29.7;

double *ptr = &value;

Write a cout statement that uses the ptr variable to display the contents of the value variable.

Look at the following function definition.

void getNumber(int &n)

{

cout << “Enter a number: “;

cin >> n)

}

In this function, the parameter n is a reference variable. Rewrite the function so that n is a pointer.

Correct the following code snippet -

int x, *ptr = nullptr;

ptr = &x;

ptr = 100;              / Store 100 in x

cout << x << endl;

Explanation / Answer

1.
   int x = 7;

   int *iptr = &x;

   cout<<*iptr;   // it will show 7, value of variable to whic iptr points
   cout<<iptr; // it will print address of x, content of iptr

2.
   int numbers[] = {2, 4, 6, 8, 10};
   cout << *(numbers + 3) << endl; // it will print element at index 3- numbers[3], 8
  
3.
   double value = 29.7;

   double *ptr = &value;
  
   cout<<*ptr; // will dispaly value of value variable
  
4.
   void getNumber(int &n)
   {

   cout << “Enter a number: “;

   cin >> n)

   }
  
   Using pointer:
  
   void getNumber(int *n)
   {

   cout << “Enter a number: “;

   cin >> *n

   }
  
5.
   int x, *ptr = nullptr;

   ptr = &x;

   *ptr = 100;              // Store 100 in x

   cout << x << endl;

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