30 lines
1.2 KiB
Plaintext
30 lines
1.2 KiB
Plaintext
REM >strcomp
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shav$ = "Shaw, George Bernard"
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shakes$ = "Shakespeare, William"
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:
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REM test equality
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IF shav$ = shakes$ THEN PRINT "The two strings are equal" ELSE PRINT "The two strings are not equal"
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:
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REM test inequality
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IF shav$ <> shakes$ THEN PRINT "The two strings are unequal" ELSE PRINT "The two strings are not unequal"
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:
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REM test lexical ordering
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IF shav$ > shakes$ THEN PRINT shav$; " is lexically higher than "; shakes$ ELSE PRINT shav$; " is not lexically higher than "; shakes$
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IF shav$ < shakes$ THEN PRINT shav$; " is lexically lower than "; shakes$ ELSE PRINT shav$; " is not lexically lower than "; shakes$
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REM the >= and <= operators can also be used, & behave as expected
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:
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REM string comparison is case-sensitive by default, and BBC BASIC
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REM does not provide built-in functions to convert to all upper
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REM or all lower case; but it is easy enough to define one
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:
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IF FN_upper(shav$) = FN_upper(shakes$) THEN PRINT "The two strings are equal (disregarding case)" ELSE PRINT "The two strings are not equal (even disregarding case)"
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END
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:
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DEF FN_upper(s$)
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LOCAL i%, ns$
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ns$ = ""
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FOR i% = 1 TO LEN s$
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IF ASC(MID$(s$, i%, 1)) >= ASC "a" AND ASC(MID$(s$, i%, 1)) <= ASC "z" THEN ns$ += CHR$(ASC(MID$(s$, i%, 1)) - &20) ELSE ns$ += MID$(s$, i%, 1)
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NEXT
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= ns$
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