Code flow

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A Computer Glossary

Charles & Ray Eames 1968

Produced for the IBM Corporation pavilion at Hemisfair, the 1968 Worlds Fair in San Antonio, Texas.

Code

http://rosettacode.org/wiki/Category:Draft_Programming_Tasks

http://rosettacode.org/wiki/99_Bottles_of_Beer

Expression / Evaluation

Some expressions for the console...

5

3

"Tristram"

'SHAndy'

Operations

5 * 3

100 - 1

3 * 8

"Tristram" + "Shandy"

Operations: Functions

Math.sqrt (25)

Math.sqrt (26)

Objects

"Tristram".toUpperCase

?!

"Tristram".toUpperCase()

Assignment

Assignment is the process of storing an expression in a "name", called a variable.

x = 5 * 3

name = "Tristram"

Assignment ++

x = x + 1

x += 1

x++

name = name + " Shandy"

BASIC

10 INPUT "What is your name: ", U$
20 PRINT "Hello "; U$
30 INPUT "How many stars do you want: ", N
40 S$ = ""
50 FOR I = 1 TO N
60 S$ = S$ + "*"
70 NEXT I
80 PRINT S$
90 INPUT "Do you want more stars? ", A$
100 IF LEN(A$) = 0 THEN GOTO 90
110 A$ = LEFT$(A$, 1)
120 IF A$ = "Y" OR A$ = "y" THEN GOTO 30
130 PRINT "Goodbye "; U$
140 END

from wikipedia:BASIC

Branch

http://en.wikipedia.org/wiki/Conditional_jump

Handouts

Assignment, GeneralImperative + ProgramHighLow

Afternoon: Image Manipulation

The CanvasPixelArray contains height x width x 4 bytes of data, with index values ranging from 0 to (height x width x 4)-1.

context.putImageData

! Come up with examples showing variable scope.