Page History

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Although this noncompliant code example compiles correctly, it is unlikely that it means what the author of the code intended.:

Code Block

bgColor	#FFcccc
lang	c

int a = 2;
int b = 2;
int c = 2;
/* ... */
if (a < b < c) /* misleading, likely bug */
/* ... */
if (a == b == c) /* misleading, likely bug */

...

Treat relational and equality operators as if it were invalid to chain them.:

Code Block

bgColor	#ccccff
lang	c

if ( (a < b) && (b < c) ) /* clearer, and probably what was intended */
/* ... */
if ( (a == b) && (a == c) ) /* ditto */

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Tool

Version

Checker

Description

Include Page

	ECLAIR_V
	ECLAIR_V

exprprns

Fully implemented.

GCC

Include Page

	GCC_V
	GCC_V

Option -Wparentheses warns if a comparison like x<=y<=z appears. This ; this warning is also enabled by -Wall.

Include Page

	PRQA_V
	PRQA_V

3392
3401
4111
4112
4113

Fully implemented.

Related Guidelines

Section 6.5.8, "Relational Operators"

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