data/examples/00tutorial/parable.bas

10 REM "Draw a parable"
20 REM ""
100 PRINT "Y=X*X"
110 FOR X=-8 TO 8
120 IF X<>0 PRINT "!"; 
130 IF X=0 PRINT "+";: FOR I=2 TO 8*8/2: PRINT "-";: NEXT: PRINT : GOTO 160
140 TAB(X*X/2-1)
150 PRINT "*"
160 NEXT X
200 END