SEI CERT C Coding Standard

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Character

Similar Characters

0 (zero)

O (capital o), Q (capital q), D (capital d)

1 (one)

I (capital i), l (lowercase L)

2 (two)

Z (capital z)

5 (five)

S (capital s)

8 (eight)

B (capital b)

n (lowercase N)

h (lowercase H)

m (lowercase M)

rn (lowercase R, lowercase N)

m (lowercase M)

Do not define multiple identifiers that vary only with respect to one or more visually similar characters.

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Search for vulnerabilities resulting from the violation of this rule on the CERT website.

Related Guidelines

SEI CERT C++ Coding StandardDCL02-CPP. Use visually distinct identifiers
ISO/IEC TR 24772:2013Choice of Clear Names [NAI]
MISRA C:2012Directive 4.5 (advisory)

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