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This rule appears in the C++ Secure Coding Standard as STR04-CPP. Use plain char for characters in the basic character set.
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Bibliography
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\[[ISO/IEC 9899:1999|AA. Bibliography#ISO/IEC 9899-1999]\] Section 6.2.5, "Types" \[[MISRA 04|AA. Bibliography#MISRA 04]\] Rule 6.1, "The plain char type shall be used only for the storage and use of character values" |
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