Command: Compare two strings for equality.
((PUB ┆ PRI))
STRCOMP (StringAddress1, StringAddress2 )
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Returns: TRUE if both strings are equal, FALSE otherwise.
- StringAddress1 is an expression specifying the starting address of the first string to compare.
- StringAddress2 is an expression specifying the starting address of the second string to compare.
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Explanation
STRCOMP is one of two commands (STRCOMP and STRSIZE) that retrieve information about a string. STRCOMP compares the contents of the string at StringAddress1 to the contents of the string at StringAddress2, up to the zero-terminator of each string, and returns TRUE if both strings are equivalent, FALSE otherwise. This comparison is case-sensitive.
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Using STRCOMP
The following example assumes PrintStr is a method created elsewhere.
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PUB Main |
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if strcomp(@Str1, @Str2) |
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PrintStr(string("Str1 and Str2 are equal")) |
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else PrintStr(string("Str1 and Str2 are different")) |
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DAT Str1 byte "Hello World", 0 |
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Str2 byte "Testing.", 0 |
The above example has two zero-terminated strings in the DAT block, Str1 and Str2. The Main method calls STRCOMP to compare the contents of each string. Assuming PrintStr is a method that displays a string, this example prints "Str1 and Str2 are different" on the display.
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Zero-Terminated Strings
The STRCOMP command requires the strings being compared to be zero-terminated; a byte equal to 0 must immediately follow each string. This practice is quite common and is recommended since most string-handling methods rely on zero terminators.