Sharp PC-1500 Instruction Manual page 82

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120 IF T > = 1 THE N 140
130 T = T + 12
140 IF T
>
23. 5959 GOTO 20
150 CURSOR 18 : PRINT T
160 GOTO 110
C.13. VAL
VAL \:Ind STAS arc complernentary functions which convert character strings to and frorn a
numeric variable. The function VAL converts a s.tring containing the character representation of
a number into a number, \Vhich is then stored in a variable .
NOTE : When anything
other than a d
igit 0 thru
9. ·
{d ecimal point}. +(posi tive sign), - (nega·
t ivc sign), or E (scientific notation) is used in the expression, conversion w ill end w ;th the illegal
charac1er.
Example 1:
10
ZS = VAL
"-37"
Result :
ZS contai ns the number - 37
Example 2 :
10
A = VAL .. 237.6"
Result:
A contai ns
the
number 237 .6
0. PRINT USING
The USING statement allows a programmer to rigidly control the format o f information on
the display. This allows stand a rdi z~d di splays and prevents loss of information .
When the USING c lause appears. a lone or wi· t hin a PR INT o r PAUSE statement , it defines
the forma t for all subsequent PR INT o r PAUSE statements until the next USING c lause is
encoun tered in the pro9ra1n.
~ver a l
USING clauses may appear within a single PRINT o r PAUSE sta tement. In this case
each one defines the fo rmat to be used to print the listed variables until the next USING clause
is encountered.
A format is specified via a string of special characters called an "editing string" . The characters
,_..,ithin the editing string define the areas of the display available for information and restrict the
type of information which may be printed in these areas. This scheme is the same general scheme
employed by other languages such as COBOL and PL/I.
An editing string may
be
stored in a string variable. The variable's name would then replace the
editing string within th e US ING clause . This al lows multiple fo rmats wh ich are selected under
program control .
The characte rs wh ich may
be
employed within editing strings are summarized below:
80
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