[CP 2] M5 - Pointers and Dynamic Arrays

int *p;

int *p;

What is the declaration for the pointer that points to a variable of type int?

20

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;

}

A symbol used to access the value of an address

&

A symbol used to determine the address of a variable

p now points to b

What will happen in this code?

int a = 100, b = 200;

int *p = &a, *q = &b;

p = q;

&

Which of the following is a reference operator? &

@

&

string mystring *;

Which of the following is NOT a way to declare a pointer variable?

All of the given

To create a dynamic array, you have to use:

"Pointer Variable All of the given Array New operator"

It depends on user input

How many number 5 will display based on the given program?

\#include <iostream\>

using namespace std;

int main() {

int n;

cin \>> n;

int * p \= new int[n];

for (int i \= 0; i<n;i++)

{

p[n] \= 5;

cout << p[n] << " ";

}

delete []p;

return 0;

}

Memory space is allocated at runtime

Which of the following is NOT true about static arrays?

Error

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;

}

143

What is the output of the given program?

\#include <iostream\>

using namespace std;

int main()

{

int *ptr \= new int;

int a \= 143;

ptr \= &a;

cout << *ptr << endl;

return 0;

}

A memory address

What is the output of the program?

\#include <iostream\>

using namespace std;

int main()

{

int *ptr \= new int;

int a \= 143;

ptr \= &a;

cout << ptr << endl;

return 0;

}

1 2 3 4 5

What is the output of the following?

\#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;

}

Pointer

It stores the memory address as its value.

90

What is the output of the following?

\#include <iostream\>

using namespace std;

int main() {

int *p1 \= new int();

int *p2 \= new int();

int *p3 \= new int();

*p1 \= 45;

p2 \= p1;

*p3 \= *p1+*p2;

cout << *p3 << endl;

return 0;

}

100 200 300 400 500

What is the output of the following program?

\#include <iostream\>

using namespace std;

int main()

{

int *dArray;

dArray \= new int [3];

dArray[0] \= 100;

dArray[1] \= 200;

dArray[2] \= 300;

for (int i \= 0; i < 3; i++)

cout << dArray[i] << " ";

delete []dArray;

dArray \= new int [2];

dArray[0] \= 400;

dArray[1] \= 500;

for (int i \= 0; i < 2; i++)

cout << dArray[i] << " ";

delete []dArray;

return 0;

}

int *ip;

Which of the following is illegal?

string s, *sp = 0;

int *pi = 0;

int *ip;

int i; double * dp = &i;

Pizza Pizza

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";

}

var1

Complete the given code:

\#include <iostream\>

using namespace std;

int main()

{

int var1 \= 17;

cout << \________ << endl;

return 0;

}

void pointer

It is a pointer not associated with any data types

new operator

Denotes a request for memory allocation on the Free Store

float a [10];

How a static array is declared?

Heap

Dynamically allocated memory is allocated on ___________________

error

What is the output of the given program?

\#include <iostream\>

using namespace std;

int main()

{

int a[2];

a[0] \= 12;

a[1] \= 12;

int a[3];

a[0] \= 12;

a[1] \= 12;

a[3] \= 12;

return 0;

}

8

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;

}

memory space is allocated during compile time

Which of the following is NOT true about dynamic arrays? Group of answer choices

Memory space is allocated during compile time

Memory space is allocated at runtime

Located in Heap memory space

Dynamic size

by applying the dereference operator

What is used for accessing the contents of memory location whose address is stored in a pointer variable?

143

What is the output of the given program?

\#include <iostream\>

using namespace std;

int main()

{

int *ptr \= new int;

int a \= 143;

ptr \= &a;

cout << *ptr << endl;

return 0;

}

90

What is the output of the following?

\#include <iostream\>

using namespace std;

int main() {

int *p1 \= new int();

int *p2 \= new int();

int *p3 \= new int();

*p1 \= 45;

p2 \= p1;

*p3 \= *p1+*p2;

cout << *p3 << endl;

return 0;

}

x is a pointer to a string, y is a string

Choose the right option:

string* x, y;

Group of answer choices

x is y

x is a pointer to a string, y is a string

this statement produces an error

both x and y are pointer to string types

dynamic array declaration

double * p = new double [45]; is an example of:

100 200 300 400 500

What is the output of the following program?

\#include <iostream\>

using namespace std;

int main()

{

int *dArray;

dArray \= new int [3];

dArray[0] \= 100;

dArray[1] \= 200;

dArray[2] \= 300;

for (int i \= 0; i < 3; i++)

cout << dArray[i] << " ";

delete []dArray;

dArray \= new int [2];

dArray[0] \= 400;

dArray[1] \= 500;

for (int i \= 0; i < 2; i++)

cout << dArray[i] << " ";

delete []dArray;

return 0;

}

ALL OF THE MENTIONED

A void pointer can point to which type of objects?

int

float

double

all of the mentioned

fg daw

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;

}

45241

\#include <iostream\>

using namespace std;

int main()

{

int var \= 11;

int *ip, *ip2;

ip \= &var;

ip2 \= ip;

cout << *ip << " " << *ip2;

return 0;

}

Pizza Pizza

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";

}

40

What is the output of the following?

\#include <iostream\>

using namespace std;

int main()

{

int var \= 40;

int *ip;

ip \= &var;

cout << *ip << endl;

//cout << "40";

return 0;

}

20

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;

}

delete operator

What operator is used to free allocated memory?

40461

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;

}

it depends on user input

How many number 5 will display based on the given program?

\#include <iostream\>

using namespace std;

int main() {

int n;

cin \>> n;

int * p \= new int[n];

for (int i \= 0; i<n;i++)

{

p[n] \= 5;

cout << p[n] << " ";

}

delete []p;

return 0;

}

100 200 300 400 500

What is the output of the following program?

\#include <iostream\>

using namespace std;

int main()

{

int *dArray;

dArray \= new int [3];

dArray[0] \= 100;

dArray[1] \= 200;

dArray[2] \= 300;

for (int i \= 0; i < 3; i++)

cout << dArray[i] << " ";

delete []dArray;

dArray \= new int [2];

dArray[0] \= 400;

dArray[1] \= 500;

for (int i \= 0; i < 2; i++)

cout << dArray[i] << " ";

delete []dArray;

return 0;

}

error

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;

}

8

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;

}

1 2 3 4 5

What is the output of the following?

\#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;

}

error

What is the output of the given program?

\#include <iostream\>

using namespace std;

int main()

{

int a[2];

a[0] \= 12;

a[1] \= 12;

int a[3];

a[0] \= 12;

a[1] \= 12;

a[3] \= 12;

return 0;

}

a memory address

What is the output of the program?

\#include <iostream\>

using namespace std;

int main()

{

int *ptr \= new int;

int a \= 143;

ptr \= &a;

cout << ptr << endl;

return 0;

}

Pizza Pizza

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";

}

None of the mentioned

"By its definition a void pointer does not point to data of a specific type. Therefore you cannot de-reference a void pointer

when it cast to another type of object yung tamang sagot"

When does the void pointer can be dereferenced?

Pizza

What is the output of the following code?

\#include <iostream\>

using namespace std;

int main()

{

string food \= "Pizza";

string* ptr \= &food;

cout << food << "\n";

return 0;

}

Pizza Pizza

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

What is the output of the following code?

\#include <iostream\>

using namespace std;

int main()

{

string food \= "Pizza";

string* ptr \= &food;

cout << food << "\n";

return 0;

}

20

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;

}

new and delete

what functions are used in dynamic memory allocation in C++?

45241

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;

}

40461

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;

}

90

What is the output of the following?

\#include <iostream\>

using namespace std;

int main() {

int *p1 \= new int();

int *p2 \= new int();

int *p3 \= new int();

*p1 \= 45;

p2 \= p1;

*p3 \= *p1+*p2;

cout << *p3 << endl;

return 0;

}

100 200 300 400 500

\#include <iostream\>

using namespace std;

int main()

{

int *dArray;

dArray \= new int [3];

dArray[0] \= 100;

dArray[1] \= 200;

dArray[2] \= 300;

for (int i \= 0; i < 3; i++)

cout << dArray[i] << " ";

delete []dArray;

dArray \= new int [2];

dArray[0] \= 400;

dArray[1] \= 500;

for (int i \= 0; i < 2; i++)

cout << dArray[i] << " ";

delete []dArray;

return 0;

}

It depends on user input

How many number 5 will display based on the given program?

\#include <iostream\>

using namespace std;

int main() {

int n;

cin \>> n;

int * p \= new int[n];

for (int i \= 0; i<n;i++)

{

p[n] \= 5;

cout << p[n] << " ";

}

delete []p;

return 0;

}

143

\#include <iostream\>

using namespace std;

int main()

{

int *ptr \= new int;

int a \= 143;

ptr \= &a;

cout << *ptr << endl;

return 0;

}

delete

to free the dynamically allocated array pointed by pointer-variable, use:

new

it is used to declare memory blocks at run time (dynamically)

dangling pointer

a pointer that no longer points to something valid on the heap

delete ptr;

what is the correct syntax for deleting a pointer named ptr:

new operator

It requests for the memory allocation in heap

call the pointer

the method of passing arguments to a function copies the address of an argument into the formal parameer