Texas Instruments TI-99/4A - Page 106

GCHAR subprogram
(Get character)
** nnNE **
36
--screen fiLLs with $$$
(code 36)
--screen cLears
>NE\oI
>100 CALL CLEAR
>110 CALL IICIlAR<1,1,36,768)
>120 CALL GCHAR(S,10,X)
>130
CALL CLEAR
>140 PRINT X
>150 END
>RUN
Examples:
bl)
b
Ib
row-num er,co umn-num er,numenc'vana
e
CHAR subprogram aIlows you to read a character from
ere on the display screen. The position of the character you
is described by row-number and column-number. The
uter puts the ASCII numeric code of the requested
cter into the numeric-variable you specify in the CALL
AR statement.
w-number and column-number are numeric expressions. If
aluation of the numeric expressions results in a non-integer
. the result is
rounded to obtain an intp.gPL A va hw of 1 fm
umber indicates the top of the screen. A value of 1 for column-
r specifies the left side of the screen. The screen can be
ht of
as a "grid" as shown here.
COLUMNS
2
4
(,
fI 111 11
14
11:1 IX
111
22 24
2Cl 2H
.It'J
32
I
I
:1 I 5
I
7 I
Q
I II I 13 I 15 I 17 I 19 I 21 I 23 I 25 I 27 I 29 I 31 I
_.
-
1()-
17
l8-
19
10-
21
22-
23
14-
1
2-
3
4-
5
0-
7
TheG
anywh
want
camp
chara
GCH
The ro
the ev
value
row-n
numbe
thoug
CALL GCHAR (
()
R Ili-
a 11
w \2-
S 1J
14-
15
11-86
User's Reference Guide