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The intent of the expression in this noncompliant code example is to test the least significant bit of x.:
| Code Block | ||||
|---|---|---|---|---|
| ||||
x & 1 == 0 |
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In this compliant solution, parentheses are used to ensure the expression evaluates as expected.:
| Code Block | ||||
|---|---|---|---|---|
| ||||
(x & 1) == 0 |
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the multiplication is performed before the addition by mathematical convention. Consequently, parentheses to enforce the algebraic order would be redundant.:
| Code Block | ||||
|---|---|---|---|---|
| ||||
x + (y * z) |
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| CERT C++ Secure Coding Standard | EXP00-CPP. Use parentheses for precedence of operation |
| ISO/IEC TR 24772:2013 | Operator Precedence/Order of Evaluation [JCW] |
| MISRA - C:2012 | Rule 12.1 (advisory) |
Bibliography
| [Dowd 2006] | Chapter 6, "C Language Issues" ("Precedence," pp. 287–288) |
| [ISO/IEC 9899:2011] | Section 6.5, "Expressions" |
| [Kernighan 1988] | |
| [NASA-GB-1740.13] | Section 6.4.3, "C Language" |
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