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18 lines
682 B
QBasic
18 lines
682 B
QBasic
1 ZEROLINE=10
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2 AMP=20
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10 DEFUN SINC(P)=IF P==0 THEN 1.0 ELSE SIN(P)/P
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20 DEFUN TOCHAR(P,X)=IF (X==ROUND(ZEROLINE+P*AMP)) THEN "@" ELSE IF (X==ZEROLINE) THEN "|" ELSE CHR(250)
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30 DEFUN SCONCAT(ACC,S)=ACC+S
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40 REM DEFUN PLOTLINE(X)=FOLD(SCONCAT,CHR(0),MAP(TOCHAR<~X,1 TO ZEROLINE+AMP))
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41 DEFUN PLOTLINE(F,X)=FOLD(SCONCAT,CHR(0),MAP(TOCHAR<~F(X),1 TO ZEROLINE+AMP))
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100 FOR I=0 TO 20
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110 PRINT PLOTLINE(SINC(I))
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120 NEXT
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999 END
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1000 REM Known bugs
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1010 DEFUN PLOTLINE(F,X)=FOLD(SCONCAT,CHR(0),MAP(TOCHAR<~F(X),1 TO ZEROLINE+AMP))
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1011 REM calling user-defined function within DEFUN is not working
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1020 REM empty string literal "" is translated to number zero (another JS blunder)
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