CS 101 Notes 3/30/2010

Exam 2 on Tuesday 4/6/2010 during class.

20 multiple choice questions

2 write code questions.

Topics: 
   If statements, 
   relational operators   > >= < <= == !=
   boolean operators   &&  ||  !

   while loops and for loops
   Methods and parameters

   picture manipulation stuff

Boolean question example

x =   ;
y =   ;
z =   ;


if (x > y && z < 10)
    x = x + 5;

if (z < y || x > 10)
    y = x + z;

if ( z < y && x > z && y != x)

if ( z < y && (x > z || y != x))


Which of the following conditional expressions
is true when the value x in in the range
from 5 to 15 (inclusive)?

(x > 15 || x < 5)
(x <= 15 && x >= 5)
(5 <= x <= 15)
(x == 5 || x == 6 || x == 7 ||  ... || x == 15)

While of the following evaluate to true?

(x < 10 && y >= 8 && z <= -4)


What is the truth table for AND?

  x  y  |   X && y   X || y   !x
=================================
  t  t  |      t        t      f
  t  f  |      f        t      f
  f  t  |      f        t      t
  f  f  |      f        f      t


Pictures have 2 dimensions

Sound has 1 dimension

Movies have 3 dimensions


With sound, we digitize the amplitude of
a sound wave.   The number represents the
position above or below the base line
in the sound wave.

The numbers range from +32,767 to -32,768

0 - 255, 256 different values 2^8

The sound has 65,000+ different value = 2^16