Lower case Lowercase letter 'l' (ell) can easily be confused with the digit '1' (one). This can be particularly confusing when indicating that an integer literal constant is a long value. This rule recommendation is similar to recommendation DCL02-C. Use visually distinct identifiers.
Likewise, you should use 'uppercase LL' rather than 'lowercase ll' when indicating that an integer literal constant is a long long value.
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printf("Sum is %ld\n", 1111 + 111l);
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The compliant solution improvises by using an upper case 'uppercase L ' instead of lower case 'lowercase l ' to disambiguate the visual appearance.
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printf("Sum is %ld\n", 1111 + 111L);
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Risk Assessment
Confusing a lower case lowercase letter 'l' (ell) with a digit '1' (one) when indicating that an integer denotation is a long value could lead to an incorrect value being written into code.
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Tool | Version | Checker | Description | section|||||||||
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| ltrlsynt | | Section | Fully Implementedimplemented |
Related Vulnerabilities
Search for vulnerabilities resulting from the violation of this rule on the CERT website.
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Lockheed Martin 2005 AV Rule 14, " Literal suffixes shall use uppercase rather than lowercase letters."
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