Sharp PC-1500 - Page 90

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F.3. CLS (Clear Screen)
The CLS statement erases the d is pl ay by turn ing off all of the do ts on the wi ndow. It is used
before other statements to remove any n~sidua l data from the display. The cursor is repositioned
to the i eft of the sc reen by the CLS comma nd . Th.c f or mat is simply CLS.
Demon str at ion Program
Keystrokes:
10 GPRINT "7F7F7F7F7F"
20 CLS
30 PRINT "NEW INFO"
rnrn~ m rn rn oo rni ••on lc:JWW rn ruruw
CD [IJ CD Cf] I SHIH I C!J , ..... 1
rnrn mmm1 • ., .. 1
G[)[lD[PJ [jiJITJ!JO 01 l sHIFT I c:J !JO fTI[ii) IS .. CE I
fTI l...!() CD {][] ( SH • rT I c:J l ••n• I
F.4. GCURSOR
T he GCURSOA statement specifies one of the· 156 columns of dots, available on the displ ay,
as the beginning co l um n for any subsequent display of i nformation . The format of t he GCURSOR
ins truction is :
GCU RSOR pos i tion·expression
where;
position -e xpressi on evalu ates to a number in the ra nge O to 155. ll'is number specifies one of
the 156 7·d ot co l umns of t he display.
NOTE : If a position·expression res ults in a numl>er i..vh ich is less tha1) O or greater than 155. an
ERROR 19will occur.
T he GCURSOR statement is usually used, in conjunction with the GPRINT st atem e nt, fo r the
pur pose of creating graphic displays !this will be illus trat ed mo re thoroughly in the next soction).
Other
types of instructions may lo ll ow the GCURSOR statement since this statement does not
write any inform ai tion. GCURSOR merely indicates in which column subS:equent information \•Jill
be written. This i~ i ll ustrated by th e following linC?s:
Program l isting:
10 GCURSOR 50
20 PRINT "A"
30 GCURSOR 80
40 PRINT 26/3
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