IF [#500 EQ 5] THEN G91 G28 Z0. M30

IF [#500 EQ 5] GOTO 50

WHILE [#500 NE 0] D0 1
---
#500 = ???
END 1
--
N50
G91 G28 Z0.
G28 X0. Y0.
M30

#100 = 23.61;
#101 = ROUND[#100]; //24
#102 = FIX[#100]; //23
#103 = FUP[#100]; //24

---

@201:=#1000; // #201 = #4201
@202:=#1004; // #202 = #4203   
@203:=#1036; // #203 = #20   
@999:=1;        
WAIT();
M5;