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Is it safe to convert lowercase to uppercase by ORing with x40?

April 26, 2017convert lowercase oring safe uppercase

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Is it safe to convert lowercase to uppercase by ORing with x40?

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No. Code pages other than 37 or 1047 have uppercase alphabetic characters that fall outside the x’C1′ to x’F9′ range. This item was created from a post to the ASSEMBLER-LIST mailing list by Edward E. Jaffe 2004-06-24.