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- 5 ONERRORGOTO900
- 20 MODE8:DIM:r=0:s=0:h=0:c$=CHR$(5)
- 30 CLS:PRINT"ã(R+r)û(hý+(R-r)ý)+ã(Rý+rý)";
- 40 s$="r":z=r:GOSUB500:r=z
- 50 s$="R":z=s:GOSUB500:s=z
- 60 s$="h":z=h:GOSUB500:h=z
- 70 LOCATE0,1:PRINTc$;"Surface =";PI*(r+s)*SQR(h*h+(s-r)^2)+PI*(r^2+s^2);:z$=INPUT$(1,@):GOTO40
- 500 LOCATE0,1:PRINTc$;s$;"=";z;"?";:INPUT@42;z:LOCATE0,0:IFz<0 THEN500 ELSERETURN
- 900 IFERR=1 THENCLS:ONERRORGOTO0
- 910 IFERL=500 THENRESUME500
- 920 LOCATE0,1:PRINTc$;"not found";:z$=INPUT$(1,@):RESUME30
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