Question

using visual studio

2) For each of the following, write C++ statements that perform the specified task.. (Ref: classwork named pointer2) a) Declare a built-in array of type unsigned int called values with five elements, and initialize the elements to the even integers from 2 to 10. b) Declare a pointer vPtr that points to a variable of type unsigned int. c) Write two separate statements that assign the starting address of array values to pointer variable vPtr. d) Use a for statement to print the elements of array values using pointer/offset notation. e) Refer to the fifth element of values using pointer subscript notation. f) Assume that unsigned integers are stored in two bytes and that the starting address of the array is at location 1002500 in memory. • If vPtr points to the first element of array values, then what address is referenced by vPtr + 3? (manually calculate) • What value is stored at that location?

Answer 1

A) Here values is an array of size 5 which stored even numbers from 2 to 10 and each element is of type unsigned int

unsigned int values [5] = {2,4,6,8,10};

B) Here a is of type unsigned int and vptr is a pointer that points to a variable of typr unsigned int

unsigned int a;4
unsigned int * vptr = &a;

C)Following are the two ways of assigning start address of an array to the pointer variable

vptr = values;
vptr = &values[0];

D)Below loop is used to print the array elements using pointer subscript notation

for (int i=0;i<5;i++)
cout<<*(vptr+i);

E) here the index start from 0 so the first element is at index 0 hence the fifth element is at index 4 by vptr+4 we point to the fifth element and use derefrencing operator '*' to print its value

int fifth_value = *(vptr+4);

F)

start address = 1002500

ech element takes 2 bytes

then vptr+3 = 1002500+3*2

= 1002506

value stored at location is the third elemnt i.e. 8