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I am using the tutorials in the GlBasic app and I understand all of it exept when the section first game hits and the part with subs and jumpmarks. I dont really see a use for jumpmarks with the way it is explainded and I dont uderstand subs at all and I would like to code more complex games but I feel like these things are holding me back so if any one can elaborate so I can start programing I would appreciate it Thank You


PS and I understand arrays but dont really know how to implent it my programs


PLEASE HELP ME 

it draws the sprite but the if will not work Basic is more confusing than c lol
I am gessing it is a simple mistake

Code (glbasic) Select Expand

LOADSPRITE "bubble.png",0

LET x=250   
DRAWSPRITE 0,x,0
SHOWSCREEN

IF KEY (203) = 1
PRINT "key pressed", 20, 20
SHOWSCREEN
ENDIF


MOUSEWAIT
END

  I am just learning basic but I know and love c and when I type an example that loads, draws, sprite then shows the screen it is still black I cant get any new type of project like that to work

any help is appreciated Thank You