Is the order of the boolean expressions in if statement fixed?

Question

Is the order of boolean expressions in this if statement fixed?

if(boolean_expression_1 || boolean_expression_2) {

}

Is boolean_expression_1 always evaluated before boolean_expression_2? Is the order of evaluation a standard in C?

Take a look [here](http://stackoverflow.com/questions/31437095/conditional-execution-based-on-short-circuit-logical-operation) — Eugene Sh., Jun 01 '16 at 14:47

score 5 · Accepted Answer · answered Jun 01 '16 at 14:41

Yes. It's guaranteed. It's called "short circuit" evaluation.

From C11 draft, 6.5.14 Logical OR operator:

Unlike the bitwise | operator, the || operator guarantees left-to-right evaluation; if the second operand is evaluated, there is a sequence point between the evaluations of the first and second operands. If the first operand compares unequal to 0, the second operand is not evaluated.

(emphasis mine).

Is the order of the boolean expressions in if statement fixed?

1 Answers1