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If/Then/Else/EndIf
The basic logic building block of any application is the If/Then block. If, which is used in conjunction with a comparison operator, tests whether a certain condition has been reached, such as an input being above a certain number.
When combined with Else you can perform a separate set of logic when the condition tested by the If statement is not reached.
All If/Then statements must be performed in blocks, such as below:
If x = 7 Then
return
Else
drawLine(0,0,x,y)
EndIf