Programming Fundamental

1. Variable

1.1. user defined variable

1.1.1. x=15

1.2. system variable

1.2.1. PI

1.3. user defined function

1.3.1. drawCircle

1.4. system function

1.4.1. ellipse

2. Local/Global variables

2.1. local variable

2.1.1. drawEllipse(50); drawEllipse(20); void drawEllipse(int r);{ ellipse(60,75,r,r); }

2.2. global variable

2.2.1. int x = 10; void draw(){ ellipse(60,75,x,x); }

3. Condition

3.1. If

3.1.1. void draw(){ drawCircle(100,100,r); r = r + 5; if (r > 100){ r = 0 }

3.2. Else

4. Basic Shape

4.1. ellipse(x,y,width,height)

4.2. line(x1,y1,x2,y2)

4.3. triangle(x1,y1,x2,y2,x3,y3)

5. Data

5.1. int(integer)

5.2. float