- For the following program, assume it is valid, what is the output?
(15%)
<![CDATA[#include <stdio.h>
main ()
{
char x = 'A', y = 'B';
int *p;
p = (int *) &x;
printf ("%d\n", *p);
}
]]>
If
sizeof (int) = 2, sizeof (char) = 1, and x and y are allocated consecutively. Also, the ASCII values of 'A' and 'B' are 48 and 49 respectively.
- Represent 12.34 into a 16-bit floating-point format with
bit 15: sign bit
bits 14-10: exponent (bias 15)
bit 9-0: mantissa with hidden bit and format 1.XXX... (8%)
- Which is wrong, a or b? Why? (6%)
int n[10];
int *m;
n = m; /* a */
m = n; /* b */
- What is the output of the following: (18%)
<![CDATA[a. i = 0;
while (i++ <= 10);
printf ("%d\n", i);
b. for (sum = 0, i = 1; i <= 10; sum += i++);
printf ("%d %d\n", sum, i);
c. i = 1;
while (i <= 10)
j = ++i;
k = i++;
printf ("%d %d %d\n", i, j, k);
d. short i = -10;
printf ("%u\n", i); /* sizeof (short) = 1 */
]]>
- Define the following sequences:
f0 = a0
| f3 = a3 + |
1 |
|
| a2 + |
1 |
|
|
| a1 + |
1 |
|
|
| a0 |
and so on.
If
a0 ,
a1 ,
a2 , ... ,
an , ...
are stored in the array a as
[a0
a1
a2 ...
an ...
], write a recursive function to calculate
fn.
(18%)
- If x, y and z are integers, write a function which returns 1 if they
represent the three sides of a triangle; otherwise return 0. (10%)
- What is the output of the following: (15%)
<![CDATA[#include <stdio.h>
int x = 10, y = 5;
int h (int *x, int w)
{
int static z = 2;
*x = (++z) + (y++);
z += w--;
return (y + w);
}
main ()
{
printf ("%d\n", h (&x, y));
printf ("%d\n", h (&y, x));
printf ("%d %d\n", x, y);
}
]]>
- Sort the following sequences using
a. Selection sort
b. Improved bubble sort
2, 1, 5, 4, 3
Write down the appearance of the sequences after each pass. (10%)
- END -
Formatted by Ngai Chi-ho,
Formatted by Ngai Chi-ho,
Copyright © 1995.
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