Is the evaluation order of operands in `a b` guaranteed in C ?

Evaluation Order of Operands in C

When evaluating an expression involving multiple operands, it's essential to understand the order in which they are processed. In the specific case of a b, is a guaranteed to be evaluated before b, or is the order indeterminate?

According to the C Standard:

For User-Defined Types:

• a b is treated as a function call, and the order of argument evaluation is unspecified.

For Regular Operators:

• The order of evaluation of operands and subexpressions is generally unspecified. However, in C 11, the wording has changed to "unsequenced," essentially meaning the same thing.

Therefore, in both C and C, the evaluation order of a and b in the expression a b is not determined by the language specification. It may vary depending on factors such as compiler optimizations and hardware architecture.

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