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Note that the range is in terms of character code values, and on an EBCDIC platform it will include some non-alphabetic codes. Consequently the isalpha() function should be used to verify the input.

Non-Compliant Code Example

Mismatches between arguments and conversion specifiers may result in undefined behavior. Many compilers can diagnose type mismatches in formatted output function invocations.

char const *error_msg = "Resource not available to user.";
int error_type = 3;
/* ... */
printf("Error (type %s): %d\n", error_type, error_msg);

Compliant Solution

This compliant solution ensures that the format arguments match their respective format specifiers.

char const *error_msg = "Resource not available to user.";
int error_type = 3;
/* ... */
printf("Error (type %d): %s\n", error_type, error_msg);

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