KITFORMA · EDITORIAL ANSWER
Why does a scaling macro produce a different result for x+1?
KitForma editorial guide. Macro substitution does not automatically group the argument as one expression. Multiplication or bitwise operators can bind to only part of a substituted expression.
Step-by-step answer
Macro substitution does not automatically group the argument as one expression. Multiplication or bitwise operators can bind to only part of a substituted expression.
If a macro is necessary, parenthesize each parameter occurrence and the complete expression. For example, an arithmetic macro intended to double a value needs grouping around the substituted value before multiplication. Prefer an inline function when type handling and single evaluation matter.
Test a literal, an addition expression and use of the macro inside division. Inspect preprocessed output when the result remains surprising. Correct parentheses do not prevent overflow, repeated evaluation or name collisions; those are separate reasons to keep macros small.
Sources and verification
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