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CP2-Module 5
Pointers and Dynamic Arrays
| Question | Answer |
|---|---|
| Which of the following is NOT a way to declare a pointer variable? string* mystring; string mystring *; string * mystring; string *mystring; | string mystring *; |
| A symbol used to access the value of an address & $ * # | * |
| What is the output of the following? #include <iostream> using namespace std; int main() { int var = 20; int *ip; ip = &var; cout << *ip << endl; return 0; } 20 1 0 40 | 20 |
| Which of the following is illegal? int i; double * dp = &i; int *ip; int *pi = 0; string s, *sp = 0; | int *pi = 0; //unsure, it should be the "int i; double * dp = &i;" but no. Also not "string s, *sp = 0;" |
| Which of the following is a reference operator? * @ & & | & |
| What is the output of the following? #include <iostream> using namespace std; int main() { int var = 11; int *ip, *ip2; ip = &var; ip2 = ip; cout << *ip << " " << *ip2; return 0; } 11 11 Error 22 11 | 11 11 |
| What is the output of the following program? #include <iostream> using namespace std; int main() { string food = "Pizza"; string * ptr = &food; cout << food << " "; cout << *ptr << "\n"; } Pizza Pizza 0 Pizza Error | Pizza Pizza // not error, still runs without "return 0;" |
| What is the declaration for the pointer that points to a variable of type int? int *p; int(p); INT *p; int p; | int *p; |
| A symbol used to determine the address of a variable # $ & * | & |
| What will happen in this code? int a = 100, b = 200; int *p = &a, *q = &b; p = q; p now points to b a is assigned to b q now points to a b is assigned to a | p now points to b |
| Dynamically allocated memory is allocated on ___________________ Heap Array Variable Stack | Heap |
| #include <iostream> using namespace std; int main() { int * foo; foo = new int [5]; foo[0] = 1; foo[1] = 2; foo[2] = 3; foo[3] = 4; foo[4] = 5; for (int i = 0; i < 5; i++) { cout << foo[i] << " "; } delete[] foo; return 0; } Output is? | 1 2 3 4 5 |
| What is the output of the program? #include <iostream> using namespace std; int main() { int * foo; foo = new int [5]; foo[0] = 1; foo[1] = 2; foo[2] = 3; foo[3] = 4; foo[4] = 5 delete[] foo; cout ; return 0; } | Error |
| Denotes a request for memory allocation on the Free Store Group of answer choices delete operator dereferencing operator new operator address operator | new operator |
| What is used for accessing the contents of memory location whose address is stored in a pointer variable? By applying the address operator & By applying some special function By applying the dereference operator By applying an array | By applying the dereference operator |
| What is the output of the following? #include <iostream> using namespace std; int main() { int * foo = new int [5]; foo[0] = 8; cout << foo [0]; delete[] foo; return 0; } NULL 8 Error 0 | 8 |
| Which of the following is NOT true about dynamic arrays? Group of answer choices Memory space is allocated at runtime Memory space is allocated during compile time Dynamic size Located in Heap memory space | Memory space is allocated during compile time |
| What is the output of the following program? #include <iostream> using namespace std; int main() { int n; n = 3; int * p = new int[n]; for (int i = 0; i<n;i++) { p[n] = 10; cout << p[n] << " "; } delete []p; return 0; } | 10 10 10 |
| It stores the memory address as its value Group of answer choices Data type Pointer Identifier Variable | Pointer |
| How a static array is declared? Group of answer choices float * p = new float [5]; float a [10]; int n; string s; | float a [10]; |
| A pointer can NOT be stored in a variable. True or False? | False, a pointer can be stored in a variable. |
| The * operator is also called the dereferencing operator. True or False? | True |
| The & operator is also called the address-of operator. True or False? | True |
| The new operator creates a new dynamic variable of a specified type and returns a pointer that points to this new variable. True or False? | True |
| The delete operator eliminates a dynamic variable and returns the memory that the dynamic variable occupied to the ROM. True or False? | False, it returns the memory to the freestore, also known as heap. |
| When you apply delete to a pointer variable, the dynamic variable it is pointing to is created. True or False? | False, it is destroyed. |
| Variables created with the new operator are called dynamic variables because they are created and destroyed while the program is running. True or False? | True |
| You can assign a name to a type definition and then use the type name to declare variables. This is done with the keyword typedefinition. True or False? | False, it is only written as "typedef" |
| You can declare a dynamic array using the variable type double. True or False? | False, you should only use int. |
Created by:
Easy Kwatro
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