CUS 291

A few review questions

1.) Functions: Given:

float sample1[10];

Explain the difference(s) between:

fun1(sample1);

fun2(sample[2]);

2.) Recursion: Write a recursive function that computes

S(n) = 2 + 4 + 6 + .... + 2n

[ Hint: S(n) = S(n - 1) + 2n ]

3.) Recursion: Write a nonrecursive function to compute the nth fibonacci number.

4.) Arrays: Do each of the following declarations allocate the same number of cells:

char some_chars[1000];

int some_ints[10][100];

5.) Pointers: What is the error in this slice of code:

char var1, ptr1;

var1 = ‘x’;

ptr1 = &var1;

6.) Pointers: What is printed:

char var1 = ‘S’;

char var2 = ‘X’;

char *ptr1, *ptr2;

ptr1 = &var1;

ptr2 = &var2;

*ptr2 = *ptr1;

cout << *ptr1 << “ “ << var2;

7.) Pointers: Given: int var1 = 2121;

int *ptr;

ptr = &var1;

and that var1’s address is 99999.

What is the value of var1?

What is the value of ptr?

What is the value of *ptr?

8.) Pointers: What is printed?

int nums[5] = {11, 22, 33, 44, 55}

int *ptr = nums + 5;

int i;

for (i = 0; i < 5; ++i)

cout << *ptr;

9.) Pointers: Given:

int numbs[10];

int *ptr = numbs;

which of the following expressions are equivalent?

a) numbs[3]

b) numbs + 3

c) *(numbs + 3)

d) *(ptr + 3)

e) *ptr + 3