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CS223 Exercises

Section 1.6 Homework 6 -- Pointers

Exercises Exercises

1.

When you declare a variable, the amount of memory that will be allocated for that variable is determined when?
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  • When the program is being compiled.
  • During the linking phase of the build process.
  • When the program starts running.
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2.

Your program needs more memory during execution time. From where can you get this additional memory?
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  • heap (a.k.a. free store)
  • stack
  • static memory
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3.

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4.

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5.

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6.

Suppose that we have already allocated storage on the heap for a dynamic array of Person objects:
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Person* arr = new Person[10];
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To deallocatethe entire dynamic array, which of the following is correct?
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  • delete [] arr;
  • delete arr;
  • delete arr[];
  • delete[] arr[];
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7.

A pointer stores what?
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  • a memory location
  • a variable name
  • the value of a primitive data type (e.g., an integer or a bool)
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8.

Which of the following functions DOES NOT have a memory leak?
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  • void func(string word)
{
    int* ptr = NULL;
    int len = word.size();
    ptr = &len
    cout << "Length of " << word << " is " << *len << endl;
}

  • void func(string word)
{
    int* ptr = new int;
    *ptr = word.size();
}

  • void func(string word)
{
    int* ptr = new int[2]; 
    ptr[0] = word.size();
    delete ptr;
}
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9.

Which of the following memory drawings accurately depicts what memory will look like after the following lines of code execute? HINT: Pay attention to the difference between "stack" and "heap".
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int x = 23;
int* p = &x;
int** m = &p;
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10.

Which of the following memory drawings accurately depicts what memory will look like after the following lines of code execute?
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Person* ptr = NULL;
ptr = new Person[2];
ptr[0] = Person(“Cleo”, “Wilson”, 7);
ptr[1] = Person(“Mr.”, “Gray”, 10);
Person* Q = ptr;
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11.

Which of the following memory drawings accurately depicts what memory will look like after the following lines of code execute?
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char* p_array = new char[3];
char** p_p_array = &p_array;
p_array[0] = 'A';
p_array[1] = 'B';
p_array[2] = 'C';
delete p_array;
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12.

When the following code executes, what is the output?
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string s1 = "Ruthie";
string s2 = "Skye";
string* my_ptr = &s1;
string* other_ptr = &s2;
other_ptr = my_ptr;
*other_ptr = "Ziggy";
cout << *my_ptr;
  • Ziggy
  • Skye
  • Ruthie
  • Cleo
  • no output (empty string)
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13.

When the following code executes, what is the output?
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string s1 = "Ruthie";
string s2 = "Skye";
string* my_ptr = &s1;
string* other_ptr = &s2;
*other_ptr = *my_ptr;
*other_ptr = "Ziggy";
cout << *my_ptr;
  • Ziggy
  • Skye
  • Ruthie
  • Cleo
  • no output (empty string)
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14.

Which of the following statements will be true after the following code has executed?
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string mystr = "cool";
string* sptr1 = &mystr;
string* sptr2 = new string;
sptr1 = sptr2;
mystr = "cats";
  • The value of *sptr1 will be "cool", and the value of *sptr2 will be "cats".
  • The value of *sptr1 will be "cats", and the value of *sptr2 will be "cool".
  • The value of *sptr1 will be "cool", and the value of *sptr2 will be "".
  • The value of *sptr1 will be "", and the value of *sptr2 will be "".
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15.

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16.

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