ANDoperaattori

ANDoperaattori describes the logical conjunction or AND operator in Finnish. It is a binary operator that yields true only when both operands are true. In Boolean logic, A AND B is true exactly when A and B are true; otherwise the result is false.

A common way to express this is the truth table: A true and B true gives true; A true and B false gives false; A false and B true gives false; A false and B false gives false. In Boolean algebra this operation is also called conjunction and is often denoted by A ∧ B.

In programming and digital systems, the operator is implemented with different syntax depending on the language. In many C-like languages it appears as &&, in Python it is and, and in SQL it is the keyword AND. Logical AND typically uses short-circuit evaluation: if the first operand is false, the second is not evaluated because the overall result cannot be true. Some languages also provide a bitwise variant, which applies the operation to each bit of integer operands, producing a bitwise result rather than a boolean one.

Applications of the AND operator include filtering data with multiple conditions, combining predicates, and forming part of larger logical expressions. In digital logic, the AND operation corresponds to an AND gate, which outputs a high signal only when all inputs are high. The concept underpins many algorithms, search queries, and conditional structures in programming. The term and symbol originate from Boolean algebra developed in the 19th century and remain a fundamental building block in computer science.