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| Code Block | ||
|---|---|---|
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#define sum 2+3a+b /* ... */ int result = sum*4; |
The value of result is 14 a+(b*4) instead of the expected 20(a+b)*4.
Compliant Solution
Parenthesizing the macro yields the expected answer.
| Code Block | ||
|---|---|---|
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#define sum (2a+3)b) /* ... */ int result = sum*4; /* 20 */ |
Risk Assessment
Failing to parenthesize around a function-like macro can result in unexpected arithmetic results.
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