Computer Science Ii

Front 1

Write A Statement that Displays the Address of the variable count.

Back 1

cout << &count;

Front 2

Write definition statement for variable fltPtr. A pointer to float

Back 2

float *fltPtr;

Front 3

List Three uses of *

Back 3

Multiplication operator, pointer definition, indirection operator.

Front 4

Output:

int x=50, y=60, z=70;

int *ptr = nullptr;

cout << x << " " << y << " " << z << endl;

ptr = &x

*ptr *= 10

ptr = &y

*ptr *= 5

ptr = &z;

*ptr *= 2;

cout << x << " " << y << " " << z << endl;

Back 4

50 60 70

500 300 140

Front 5

Rewrite w/ pointer:

for (int x=0; x<100; x++)

cout << arr[x] << endl;

Back 5

for (int x=0; x<100; x++)

cout << *(array + x) << endl;

Front 6

assume ptr is to int and &ptr= 12000. on a system with 4 byte integers, what address will be in ptr after...

ptr += 10;

Back 6

12040

Front 7

Assume pint is pointer variable. are these valid?

pint++;

--pint;

pint /= 2;

pint *=4;

pint += x; //assume x is int

Back 7

valid

valid

invalid. only addition/subtraction for pointers

invalid.

valid

Front 8

Valid or invalid?

_______

int ivar;

int *iptr= &ivar;

________

int ivar, *iptr = &ivar;

________

float fvar;

int *iptr= &fvar;

_______

int nums[50], *iptr = nums;

_______

int *iptr = &ivar;

int ivar;

Back 8

valid

valid

invalid. fvar is a float and 1ptr is a pointer to int

valid

invalid. ivar must be declared before tptr.

Front 9

9.9 Assuming arr is an array of ints, will each of the following program segments display “True” or “False”?

A) if (arr < &arr[1])

cout << "True";

else

cout << "False";

B)if (&arr[4] < &arr[1])

cout << "True";

else

cout << "False";

C)if (arr!= &arr[2])

cout << "True";

else

cout << "False";

D)if (arr!= &arr[0])

cout << "True";

else

cout << "False";

Back 9

true

false

true

false

Front 10

Give an example of the proper way to call the following function:

void makeNegative(int *val)

{

if (*val > 0)

*val = -(*val);

Back 10

makeNegative (&num);