Does `(4 > y > 1)` in C Evaluate as Expected?

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Evaluating Chained Logical Operators: (4 > y > 1) in C

The expression (4 > y > 1) in C raises questions about its validity and evaluation. Here's a detailed explanation:

Validity:

The expression itself is syntactically valid in C , but its semantic interpretation may be unexpected.

Evaluation Order:

C evaluates logical operators from left to right. Therefore, (4 > y > 1) is parsed as ((4 > y) > 1).

Semantic Interpretation:

The expression ((4 > y) > 1) compares the result of (4 > y) with 1. (4 > y) returns 1 if y is less than 4, and 0 otherwise.

Result:

Since 0 or 1 is never greater than 1, the expression ((4 > y) > 1) always evaluates to false. In other words, the statement (4 > y > 1) is never true, regardless of the value of y.

Rewrite:

A more meaningful expression would be to use logical AND (&&) instead of chained greater-than operators. For example:

(4 > y) && (y > 1)

This expression is true only if both (4 > y) and (y > 1) are true.

Exception:

In certain cases, the behavior of chained logical operators may differ from the expected outcome. Specifically, if y is an instance of a class that overloads the > operator, the result can depend on how the operator is implemented.

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