Sharp PC-1403 - Page 182

1 76
The W k e y m ay be rea d when th e pr o gr a m is s ta rt e d b y p r e ssi ng t he IQgfJ W
ke ys .
Lines 40 and beyond con t a i n te st s fo r t he ke y and t he a c ti on s to be taken (for example:
40 PRINT A$ ) . On f ir st e x ec uti ng th e prog ra m , t he va lu e of INKEY$ is n ull , since the
last key p r essed was I ENTER I .
• If an INKEY$ c o mm a n d i s wr itten at t he beg inn i n g o f th e p rog r a m , the s tart key may
be read (b y th e INKE Y $ command ) when t he pro gra m is s tart ed. For e x ampl e , in
the fo llowing p ro g ra m
10 " Z " : Z $ =lNKE Y$
IN K E Y$ i s a s t ri ng p seu dovariab l e wh i ch h a s t he va l u e o f t h e la s t key presse d on th e
keyboa r d . l ENTER J ' ~ ' ( S H t FT I ' ~ ' ~ .cn . rr; ' CB ' BJ ' ~ '
~ , a n d sc i e n t ific f u nc t i on key s a ll have a va l u e o f nu ll. I N K EY $ is u s ed t o r e s pond
t o t he p r essing o f in d iv id u a l k e ys wi t ho ut w ait i ng for t h e EN TER k e y t o e n d the inpu t.
5 WAIT 50
10 A$=1NKEY $
20 B=ASC A$
30 IF 8=0 THEN GOTO 1 0
40 IF B .. .
1 INKEY$
Pseudova ria ble s are a gro up o f fun ctions w hic h t ak e n o ar g ument a nd are u sed l i k e
s imp l e v ar iables w h e r ev e r r e q u i re d .
Pseudovar i ables
FUNCTIONS
Functions
Pseudovarlables