Limiting guy's movement within the screen

pyras.p8

@@ -18,10 +18,10 @@ guyspeedx=2
 guyspeedy=2
 
 function moveguy()
-	if (btn(0)) guyposx-=guyspeedx
-	if (btn(1)) guyposx+=guyspeedx
-	if (btn(2)) guyposy-=guyspeedy
-	if (btn(3)) guyposy+=guyspeedy
+	if (btn(0)) guyposx=max(0,guyposx-guyspeedx)
+	if (btn(1)) guyposx=min(127,guyposx+guyspeedx)
+	if (btn(2)) guyposy=max(0,guyposy-guyspeedy)
+	if (btn(3)) guyposy=min(127,guyposy+guyspeedy)
 end
 
 function drawguy()