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https://github.com/QB64-Phoenix-Edition/QB64pe.git
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6e01fc8dce
Added new _STRCMP and _STRICMP commands for quick string comparisons. Cleaned up QB64 to finish removing the QUI (quick user insert) code and folders. Altered UCASE and LCASE routines to be faster in some situations for us.
54 lines
2.1 KiB
Plaintext
54 lines
2.1 KiB
Plaintext
The '''RIGHT$''' function returns a set number of characters in a [[STRING]] variable starting from the end and counting backwards.
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{{PageSyntax}}
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:: RIGHT$(stringvalue$, numberofcharacters%)
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* The string value can be any string of [[ASCII]] characters as a string variable.
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* If the number of characters exceeds the string length([[LEN]]) the entire string is returned.
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* Number of characters cannot be a negative value.
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* RIGHT$ returns always start at the last character of the string, even if a space. [[RTRIM$]] can remove ending spaces.
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''Example 1:'' Getting the right portion of a string value such as a person's last name.
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{{CodeStart}} '' ''
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name$ = "Tom Williams"
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Last$ = {{Cl|RIGHT$}}(name$, {{Cl|LEN}}(name$) - {{Cl|INSTR}}(name$, " ")) 'subtract space position from string length
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{{Cl|PRINT}} Last$ '' ''
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{{CodeEnd}}
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{{OutputStart}}Williams {{OutputEnd}}
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''Example 2:'' Adding the leading zero in single digit [[HEX$]] values using RIGHT to take the right two hexadecimal string digits.
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{{CodeStart}} '' ''
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{{Cl|SCREEN}} {{Cl|_NEWIMAGE}}(640, 480, 32) '32 bit screen modes ONLY!
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red = 255
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green = 0
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blue = 128
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Color32 red, green, blue
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{{Cl|PRINT}} "Colored text"
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{{Cl|SUB}} Color32 (R, G, B)
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R = R {{Cl|AND (boolean)|AND}} {{Cl|&H}}FF: G = G {{Cl|AND (boolean)|AND}} {{Cl|&H}}FF: B = B {{Cl|AND (boolean)|AND}} {{Cl|&H}}FF ' limit values to 0 to 255
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hexadecimal$ = "{{Cl|&H}}FF" + {{Cl|RIGHT$}}("0" + {{Cl|HEX$}}(R), 2) + {{Cl|RIGHT$}}("0" + {{Cl|HEX$}}(G), 2) + {{Cl|RIGHT$}}("0" + {{Cl|HEX$}}(B), 2)
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{{Cl|PRINT}} hexadecimal$
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{{Cl|COLOR}} {{Cl|VAL}}(hexadecimal$)
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{{Cl|END SUB}} '' ''
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{{CodeEnd}}
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{{OutputStart}}'''{{text|&HFFFF0080|white}}'''
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'''{{text|Colored text|#FF0080}}'''{{OutputEnd}}
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: ''Note:'' When a single hexadecimal digit is returned the resulting value will need the leading zero added. Otherwise the hexa- decimal value created will have a byte missing from the value. EX: Color &HFF000000 is valid while &HFF000 is not.
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''See also:''
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* [[LEFT$]], [[MID$]]
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* [[LTRIM$]], [[RTRIM$]]
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* [[INSTR]], [[HEX$]]
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{{PageNavigation}} |