What are the key differences in the conditional operator\'s behavior between C and C ?

Differences Between C and C Conditional Operator (?)

The conditional operator (?:) provides a concise way to evaluate expressions based on conditions. However, it exhibits subtle differences in functionality between C and C .

Lvalue Assignment:

In C , the conditional operator can return an lvalue, allowing expressions like:

(true ? a : b) = 1;

This assigns the value 1 to either a or b depending on the truthiness of true. In C, this is not permitted, and one must use an if/else statement or work directly with references:

*(true ? &a : &b) = 1;

Operator Precedence:

In C , the ?: and = operators have equal precedence and group right-to-left. This means that the following is valid:

(true ? a = 1 : b = 2);

However, in C, this will raise an error without parentheses around the last expression:

(true ? a = 1 : (b = 2));

Consequently, when using the conditional operator in mixed C and C environments, it is crucial to be aware of these nuanced differences to avoid unexpected behavior.

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