QA C Help - Rule 4.2

		MISRA-C:2004 Rule 4.2: (Required)			Trigraphs shall not be used.

Trigraphs are denoted by a sequence of 2 question marks followed by a specified third character (e.g. ??- represents a '~' (tilde) character and ??) represents a ']'). They can cause accidental confusion with other uses of two question marks. For example the string

"(Date should be in the form ??-??-??)"

- would not behave as expected, actually being interpreted by the compiler as
"(Date should be in the form ~~]"

QAC messages that encompass this guideline:

3601 Trigraphs (??x) are an ISO feature.

(c) The Motor Industry Research Association, 2004

QA C Source Code Analyser 8.1.2
MISRA-C:2004 Compliance Module 3.2
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