10 POKE53280,0:POKE53281,6:PRINT"[147][158]":FORV=1TO4:PRINT" ";V;"[157].ZAHL : ";
20 POKE19,1:INPUTZ(V):PRINT:POKE19,0:NEXT:POKE19,1:INPUT" ERGEBNIS : ";E
30 POKE19,0
40 GOTO60
50 E(1)=Z(1)/Z(2)/Z(3)/Z(4):RETURN
60 FORN1=1TO4:FORN2=1TO4:FORN3=1TO4:POKE2187,169+N1:POKE2192,169+N2
70 POKE2197,169+N3:GOSUB50:IFE(1)=ETHEN100
80 NEXT N3,N2,N1
90 PRINT:PRINT" NICHT LOESBAR. ":GOTO140
100 C(1)=2187:C(2)=2192:C(3)=2197:FORJ=1TO3:FORT=1TO4:READY$
110 IFPEEK(C(J))=169+TTHENU$(J)=Y$:T=4
120 NEXT T:RESTORE:NEXTJ
130 PRINT:PRINT" ";Z(1);U$(1);Z(2);U$(2);Z(3);U$(3);Z(4);"=";E
140 PRINT:PRINT" TASTE = NOCH EINMAL":WAIT198,1:GETR$:RUN
150 DATA +,-,*,/
160 (C) 1990 BY K.TIMMEN