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This is recommended because the C99 standard requires only the digit characters ('0' - '9') to have consecutive numerical values \[[C99 |http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1124.pdf]N1401\]. Thus, operations that rely on expected values for plain character or plain wide character-typed expressions can lead to unexpected behavior. |
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This rule appears in the C++ Secure Coding Standard as \[[cplusplus:STR07-CPP. Don't assume numeric values for expressions with type plain character]\]. |
References
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\[[C99|http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1124.pdf]C99 N1401\] Section 5.2.1 "Character sets" |