1. Introduction to Software

2. Software
What is software?

3. Software What is software?
Anyone remember our definition of a computer from yesterday?

4. Software What is software?
Anyone remember our definition of a computer from yesterday?
A programmable machine that inputs, outputs, and manipulates data/information according to a list of instructions.

5. Software What is software?
Anyone remember our definition of a computer from yesterday?
A programmable machine that inputs, outputs, and manipulates data/information according to a list of instructions.

6. Software What is software?
Anyone remember our definition of a computer from yesterday?
A programmable machine that inputs, outputs, and manipulates data/information according to a list of instructions.
Software is the list of instructions that tells a computer what to do.

7. Software
Examples of software:

8. Software
Examples of software:
MS Word

9. Software
Examples of software:
MS Word
The games you play

10. Software Examples of software: MS Word The games you play
Facebook, Twitter, Skype

11. Software Examples of software: MS Word The games you play
Facebook, Twitter, Skype
Web browsers: Internet Explorer, Firefox, etc.

12. Software Examples of software: MS Word The games you play
Facebook, Twitter, Skype
Web browsers: Internet Explorer, Firefox, etc. …

13. Software
What does software look like?

14. Actual Code From Counter-Strike
// Out of ammo?
if ( m_iClip1 <= 0 ) {
if (m_bFireOnEmpty)
PlayEmptySound();
m_flNextPrimaryAttack = gpGlobals->curtime + 0.2; }
return false;
SendWeaponAnim( ACT_VM_PRIMARYATTACK );
m_iClip1--;
// player "shoot" animation
pPlayer->SetAnimation( PLAYER_ATTACK1 );

15. Software
It’s all Greek to me!

16. Software It’s all Greek to me!
How does the computer understand this stuff?

17. Software It’s all Greek to me!
How does the computer understand this stuff?
You have to translate it for the computer.

18. Software It’s all Greek to me!
How does the computer understand this stuff?
You have to translate it for the computer.
So…what language does the computer understand?

19. Software
Remember that analog/digital stuff from yesterday?

20. Software Remember that analog/digital stuff from yesterday?
The computer understands a digital language.

21. Software Remember that analog/digital stuff from yesterday?
The computer understands a digital language.
It is a language of 1’s and 0’s…

22. Software Remember that analog/digital stuff from yesterday?
The computer understands a digital language.
It is a language of 1’s and 0’s…
The 1’s are a “high” voltage (+5VDC) in circuit boards.

23. Software Remember that analog/digital stuff from yesterday?
The computer understands a digital language.
It is a language of 1’s and 0’s…
The 1’s are a “high” voltage (+5VDC) in circuit boards.
The 0’s are a “low” voltage (0VDC) in circuit boards.

24. A Digression…

25. A Digression – Number Systems
What number system do we count in?

26. A Digression – Number Systems
What number system do we count in?
Decimal (base 10)

27. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9

28. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.

29. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
9173

30. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

31. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

32. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

33. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

34. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

35. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

36. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

37. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

38. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

39. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

40. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

41. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

42. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

43. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

44. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

45. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

46. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

47. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

48. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

49. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

50. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

51. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

52. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

53. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

54. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

55. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

56. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

57. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 = = =

58. A Digression – Number Systems
What number system do we count in?
Decimal (base 10): digits 0-9, place value in powers of 10.
For example:
= 9 x x x x 100
= 9 x x x x 1 =
= = =

59. Number Systems
What other number systems are there?

60. Number Systems
What other number systems are there?
Binary (base 2)

61. Number Systems What other number systems are there? Binary (base 2)
Hexadecimal (base 16) – also called hex

62. Number Systems
Binary (base 2)

63. Number Systems
Binary (base 2): digits 0 & 1

64. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2

65. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2
0101

66. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2

67. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2

68. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2
= x 20

69. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2
= x 20

70. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2
= x x 20

71. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2
= x x 20

72. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2
= x x x 20

73. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2
= x x x 20

74. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2
= 0 x x x x 20

75. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2
= 0 x x x x 20

76. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2
= 0 x x x x 20
= 0 x x x x 1

77. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2
= 0 x x x x 20
= 0 x x x x 1

78. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2
= 0 x x x x 20
= 0 x x x x 1

79. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2
= 0 x x x x 20
= 0 x x x x 1

80. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2
= 0 x x x x 20
= 0 x x x x 1

81. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2
= 0 x x x x 20
= 0 x x x x 1

82. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2
= 0 x x x x 20
= 0 x x x x 1

83. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2
= 0 x x x x 20
= 0 x x x x 1

84. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2
= 0 x x x x 20
= 0 x x x x 1

85. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2
= 0 x x x x 20
= 0 x x x x 1 =

86. Number Systems
Binary (base 2): digits 0 & 1, digit place value is a power of 2
= 0 x x x x 20
= 0 x x x x 1 =
= 5

87. Number Systems
Hexadecimal (base 16)

88. Number Systems
Hexadecimal (base 16): digits 0-F

89. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16

90. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)

91. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
0xA31C

92. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C

93. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= C x 160

94. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= C x 160

95. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= x C x 160

96. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= x C x 160

97. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= x x C x 160

98. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= x x C x 160

99. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= A x x x C x 160

100. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= A x x x C x 160

101. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= A x x x C x 160

102. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= A x x x C x 160
= 10 x x x x 160

103. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= A x x x C x 160
= 10 x x x x 160
= 10 x x x x 1

104. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= A x x x C x 160
= 10 x x x x 160
= 10 x x x x 1

105. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= A x x x C x 160
= 10 x x x x 160
= 10 x x x x 1

106. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= A x x x C x 160
= 10 x x x x 160
= 10 x x x x 1

107. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= A x x x C x 160
= 10 x x x x 160
= 10 x x x x 1

108. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= A x x x C x 160
= 10 x x x x 160
= 10 x x x x 1

109. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= A x x x C x 160
= 10 x x x x 160
= 10 x x x x 1

110. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= A x x x C x 160
= 10 x x x x 160
= 10 x x x x 1

111. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= A x x x C x 160
= 10 x x x x 160
= 10 x x x x 1

112. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= A x x x C x 160
= 10 x x x x 160
= 10 x x x x 1
= 40,

113. Number Systems
Hexadecimal (base 16): digits 0-F, digit place value is a power of 16
Digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F (A=10, B=11…F=15)
A C
= A x x x C x 160
= 10 x x x x 160
= 10 x x x x 1
= 40,
= 41, 756 (base 10)

114. Number Systems So, who cares about this binary or hex stuff???
RGB: 24 bit color (True Color)

115. Number Systems So, who cares about this binary or hex stuff???
RGB: 24 bit color (True Color)

116. Number Systems So, who cares about this binary or hex stuff???
RGB: 24 bit color (True Color)

117. Number Systems So, who cares about this binary or hex stuff???
RGB: 24 bit color (True Color)
Web authoring commonly expresses color as 24 bit RGB using hex

118. Software
We write software in a programming language.

119. Software We write software in a programming language.
Translating this programming language into machine language is called compiling.

120. Software We write software in a programming language.
Translating this programming language into machine language is called compiling.
Edit

121. Software We write software in a programming language.
Translating this programming language into machine language is called compiling.
Edit, compile (full translation, every last bit of code)

122. Software We write software in a programming language.
Translating this programming language into machine language is called compiling.
Edit, compile (full translation, every last bit of code), run

123. Software We write software in a programming language.
Translating this programming language into machine language is called compiling.
Edit, compile (full translation, every last bit of code), run, run

124. Software We write software in a programming language.
Translating this programming language into machine language is called compiling.
Edit, compile (full translation, every last bit of code), run, run, run, …

125. Software We write software in a programming language.
Translating this programming language into machine language is called compiling.
Edit, compile (full translation, every last bit of code), run, run, run, …
Another way is called interpreting.

126. Software We write software in a programming language.
Translating this programming language into machine language is called compiling.
Edit, compile (full translation, every last bit of code), run, run, run, …
Another way is called interpreting.
Edit

127. Software We write software in a programming language.
Translating this programming language into machine language is called compiling.
Edit, compile (full translation, every last bit of code), run, run, run, …
Another way is called interpreting.
Edit, run (translate each line of code as you get to it)

128. Software We write software in a programming language.
Translating this programming language into machine language is called compiling.
Edit, compile (full translation, every last bit of code), run, run, run, …
Another way is called interpreting.
Edit, run (translate each line of code as you get to it),
run (translate each line of code as you get to it)

129. Software We write software in a programming language.
Translating this programming language into machine language is called compiling.
Edit, compile (full translation, every last bit of code), run, run, run, …
Another way is called interpreting.
Edit, run (translate each line of code as you get to it),
run (translate each line of code as you get to it),
run (translate each line of code as you get to it), ...

130. Programming Languages

131. Programming Languages
Compiled

132. Programming Languages
Compiled
Higher performance

133. Programming Languages
Compiled
Higher performance
Very comprehensive

134. Programming Languages
Compiled
Higher performance
Very comprehensive
“Hardcore” coding

135. Programming Languages
Compiled
Higher performance
Very comprehensive
“Hardcore” coding
Assembly Language

136. Programming Languages
Compiled
Higher performance
Very comprehensive
“Hardcore” coding
Assembly Language
Basic

137. Programming Languages
Compiled
Higher performance
Very comprehensive
“Hardcore” coding
Assembly Language
Basic
Fortran, and Pascal

138. Programming Languages
Compiled
Higher performance
Very comprehensive
“Hardcore” coding
Assembly Language
Basic
Fortran, and Pascal
C, and C++

139. Programming Languages
Compiled
Higher performance
Very comprehensive
“Hardcore” coding
Assembly Language
Basic
Fortran, and Pascal
C, and C++
Java

140. Programming Languages
Compiled
Higher performance
Very comprehensive
“Hardcore” coding
Assembly Language
Basic
Fortran, and Pascal
C, and C++
Java C#

141. Scripting Languages

142. Scripting Languages
Interpreted

143. Scripting Languages
Interpreted
Lower performance

144. Scripting Languages Interpreted Lower performance
Very high level language

145. Scripting Languages Interpreted Lower performance
Very high level language
Rapid prototyping

146. Scripting Languages Interpreted Lower performance
Very high level language
Rapid prototyping
Perl

147. Scripting Languages Interpreted Lower performance
Very high level language
Rapid prototyping
Perl
Python

148. Scripting Languages Interpreted Lower performance
Very high level language
Rapid prototyping
Perl
Python
SQL

149. Scripting Languages Interpreted Lower performance
Very high level language
Rapid prototyping
Perl
Python
SQL
JavaScript

150. Scripting Languages Interpreted Lower performance
Very high level language
Rapid prototyping
Perl
Python
SQL
JavaScript
VBScript

151. Web/Markup Languages

152. Web/Markup Languages
Primarily concerned with formatting text, pictures, etc. on the screen.

153. Web/Markup Languages
Primarily concerned with formatting text, pictures, etc. on the screen.
Html – Hypertext Markup Lang

154. Web/Markup Languages
Primarily concerned with formatting text, pictures, etc. on the screen.
Html – Hypertext Markup Lang
Xml – eXtensible Markup Lang

155. Web/Markup Languages
Primarily concerned with formatting text, pictures, etc. on the screen.
Html – Hypertext Markup Lang
Xml – eXtensible Markup Lang
CSS – Cascading Style Sheets

156. Web/Markup Languages
Primarily concerned with formatting text, pictures, etc. on the screen.
Html – Hypertext Markup Lang
Xml – eXtensible Markup Lang
CSS – Cascading Style Sheets
ASP – Active Server Pages

157. Web/Markup Languages
Primarily concerned with formatting text, pictures, etc. on the screen.
Html – Hypertext Markup Lang
Xml – eXtensible Markup Lang
CSS – Cascading Style Sheets
ASP – Active Server Pages
PHP – Hypertext Preprocessor

158. Designing Software
Have you ever looked at something and wondered how it works?

159. Designing Software
Have you ever looked at something and wondered how it works?
You are trying to figure out its “algorithm.”

160. Designing Software
Have you ever looked at something and wondered how it works?
You are trying to figure out its “algorithm.”
To write software, you need to come up with its algorithm.

161. Assignment

162. Assignment
Find something at home about which you’ve wondered how it works…

163. Assignment
Find something at home about which you’ve wondered how it works…
Spend 15 minutes thinking about it, trying to figure its algorithm out.

164. Assignment
Find something at home about which you’ve wondered how it works…
Spend 15 minutes thinking about it, trying to figure its algorithm out.
Next, go to and look your item up…

165. Assignment
Find something at home about which you’ve wondered how it works…
Spend 15 minutes thinking about it, trying to figure its algorithm out.
Next, go to and look your item up…
See how close you were!

166. Assignment
Find something at home about which you’ve wondered how it works…
Spend 15 minutes thinking about it, trying to figure its algorithm out.
Next, go to and look your item up…
See how close you were!
Be prepared to share what you found tomorrow in class!

167. Clear and Unclear Windows