String Comparison; Functions; Asc - Sharp PC-1500 Instruction Manual

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2) "ABC"
is
entered in to the area, taking up the fi rst three positions.
3) "DEFGH I" is added to the character storage arna. following "ABC".
4)
The LEFTS function acts upon the strin9 " OE FGH I" to extract "DE", whi<:h then replaces
"DEFGHI" in the area .
5) The assignment is performed and the storage area is again cleared.
B.3. String Comparison
Character strings may be compared to determine .. 'lh ich string is ''greater" or "less than" the
other. These determinations are based on the Collating Sequence {given in Appendix C) \Vhich
is the order of all the characters recognized by the computer.
It the strings c<>ntain an unequal arnount of c:haracters, the shorter string is r•padded" (filled
outl with NULL characters (ASCII
0).
The operators which are legitimate for comparison of
strings are:
=
T
rue if
the
ti.•10
strings are equal in length and contain the same ct1aracters in the
same order .
<
>
T rue if the two strings differ in length, characters, or ordering of characters.
>
True ifl the characters of the first string are "greater" (occur later in the ordering) than
the characters in the second string.
<
T~uc
if the characters of the first string arc "less than" {occur fi rst in the ordering)
than the characters in the second string.
The format for stri ng comparison is:
character string
j
OP
ch·aracter variable
character str ing
character variable
where OP is one of the comparison operators listed above.
Examples:
"MARY"> "MARI" is
Tr ue
"MARY"
=
"MARY
..
is False
"abc"
<>
"ABC"
is True
"DATA 1"
<
"DATA
2"
is.
T rue
"?"
<
"
:: "
is False
Note: The form of AS< = BS. AS> = BS cannot be used fo r comparing -character strings.
Comparison is possible however, in the forms o f (AS< BS) OR
(A S~
BS) and
(AS>
BS} OR (AS = BS).
C. FUNCTIONS
C.1. ASC
There arc two f unctions used in the coversion of characters to and from the ASCII code. The
function ASC converts a single character into its ASCII decimal code. The reverse function CH R$
converts the ASCII decimal code into a single character string.
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