> ## Documentation Index > Fetch the complete documentation index at: https://docs.syntblaze.com/llms.txt > Use this file to discover all available pages before exploring further. # C Logical OR The `||` (logical OR) operator is a binary operator that performs a boolean inclusive disjunction on two scalar operands. It evaluates to `1` (of type `int`) if at least one of its operands compares unequal to `0`, and evaluates to `0` if both operands compare equal to `0`. ```c theme={"dark"} logical-OR-expression: logical-AND-expression logical-OR-expression || logical-AND-expression ``` ## Operand Requirements Both operands must be of scalar types, which include arithmetic types (integer and floating-point) and pointer types. The operands are not required to be of the same type. During evaluation, each operand is implicitly compared against `0` (or a null pointer). ## Evaluation Mechanics and Short-Circuiting The `||` operator enforces strict left-to-right evaluation and implements **short-circuit evaluation**. 1. The left operand is evaluated first. 2. If the left operand evaluates to a non-zero value (true), the overall expression is guaranteed to be true. Consequently, the right operand is **not evaluated**. 3. The right operand is evaluated if and only if the left operand evaluates to `0` (false). ```c theme={"dark"} // Syntax visualization of short-circuiting (expr1) || (expr2) ``` *If `expr1` != 0, `expr2` is completely ignored, including any function calls or side effects within it.* ## Sequence Points A sequence point exists immediately after the evaluation of the first operand. All side effects of the first operand (such as post-incrementing or memory writes) are guaranteed to be complete before the second operand is evaluated (if it is evaluated at all). ## Result Type Regardless of the types of the operands provided, the result of the `||` operator is always of type `int`. The resulting value is strictly normalized to either `1` or `0`. ## Precedence and Associativity * **Precedence:** The `||` operator has lower precedence than the logical AND operator (`&&`) and higher precedence than the conditional operator (`?:`) and all assignment operators. * **Associativity:** It groups left-to-right. An expression like `a || b || c` is parsed as `(a || b) || c`.

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