(What's the Value of x?) The following program uses function multiple to determine if...

(What's the Value of x?) The following program uses function multiple to determine if the integer entered from the keyboard is a multiple of some integer X. Examine the function multiple, then determine X's value.

1 // ex10_16.c

2 // This program determines whether a value is a multiple of X.

3 #include

4

5 int multiple(int num); // prototype

6

7 int main(void)

8 {

9 int y; // y will hold an integer entered by the user

10

11 puts("Enter an integer between 1 and 32000: ");

12 scanf("%d", &y);

13

14 // if y is a multiple of X

15 if (multiple(y)) {

16 printf("%d is a multiple of X\n", y);

17 }

18 else {

19 printf("%d is not a multiple of X\n", y);

20 }

21 }

22

23 // determine whether num is a multiple of X

24 int multiple (int num)

25 {

26 int mask = 1; // initialize mask

27 int mult = 1; // initialize mult

28

29 for (int i = 1; i <= 10; ++i , mask <<= 1) {

30

31 if ((num&mask) !=0) {

32 mult = 0;

33 break;

34 }

35 }

36

37 return mult;

38 }