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enum { IN_STR_LEN=18, OUT_STR_LEN=20 };
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Consequently, a programmer performing maintenance on this program would need to identify the relationship and modify both definitions accordingly. While this sort of error appears relatively benign, it could easily lead to serious security vulnerabilities such as buffer overflows.
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enum { IN_STR_LEN=18, OUT_STR_LEN=IN_STR_LEN+2 };
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As a result, a programmer can reliably modify the program by changing the definition of IN_STR_LEN.
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enum { ADULT_AGE=18 };
enum { ALCOHOL_AGE=ADULT_AGE+3 }; /* misleading, relationship established when none exists */
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Consequently, a programmer performing maintenance on this program may modify the definition for ADULT_AGE but fail to recognize that the definition for PURCHASE_ALCOHOL_AGE has also been changed as a consequence.
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\[[ISO/IEC 9899-1999|AA. C References#ISO/IEC 9899-1999]\] Section 6.10, "Preprocessing directives," and Section 5.1.1, "Translation environment" \[[Plum 85|AA. C References#Plum 85]\] Rule 1-4 |
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DCL07-A. Include the appropriate type information in function declarators 02. Declarations and Initialization (DCL) DCL09-A. Declare functions that return an errno with a return type of errno_t