A) Find the errors and correct them in this code: void doSomething(int * const p

Question

A) Find the errors and correct them in this code:

void doSomething(int * const ptr)
{
   int localArray[] = { 1, 2, 3 };
   *ptr = localArray;
}

B) Show this code in Pointer notation, and in Array notation (2 sets of code)

int *arr = new int[20];

for( int i = 0; i < 20; i++)

{

       cout <<"Enter the value for index " << i <<" in the array: ";

       cin >> arr[i];

}

C) Fix the problems in the following code WITHOUT changing the function header in any way.

int *getNum()
{
   int wholeNum;

   cout << "Enter a number: ";
   cin >> wholeNum;
   return &wholeNum;
}

Explanation / Answer

A) int * ptr = localArray;

B) arr is pointer to int

arr[i] = arr+i(4) is pointer to the member in ith position of array int

int[i] is the array position i in array int

for pointer notation

int *arr = new int[20];

for( int i = 0; i < 20; i++)

{

       cout <<"Enter the value for index " << i <<" in the array: ";

       cin >> arr + i;

}

array notation

int *arr = new int[20];

for( int i = 0; i < 20; i++)

{

       cout <<"Enter the value for index " << i <<" in the array: ";

       cin >> int[i];

}

C)

Returning address to an automatic LOCAL variable is the thing which is wrong in the code!

Dereferencing the address at the calling site invokes undefined behaviour!

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