Logical operator:
Logical operators are used to validate an expression and return the Boolean values as “true” or “false”. Some of the logical operators are as follows:
- Logical “and” operator
- Logical “or” operator
- The “not” operator
Logical “and” Operator:
Logical operator combines the results of one or more conditions.
- The logical “and” is used to evaluate two expressions in order to obtain a single relational result.
- It returns the Boolean value “True”, when both the operands are true, otherwise it returns “False”.
- The first operand is evaluated first and all the side effects are completed before evaluating the logical “and” expression.
- The second operand is evaluated only if the first operand is “True”.
Syntax for “and” operator:
The syntax for “and” operator is given below:
expression1 and expression2
Logical “or” Operator:
Logical operator combines the results of one or more conditions.
- The logical “or” is used to evaluate two expressions in order to obtain a single relational result.
- It returns the Boolean value “True” when one of the operands is “True”. It returns “false” only if both the operands are “false”.
- The first operand is evaluated and all the effects are completed before it continues to evaluate the logical “or” expression.
- The second operand is evaluated only if the first operands return “false”.
Syntax for “or” operator:
The syntax for “or” operator is given below:
expression1 or expression2
Logical “not” Operator:
The logical “not” operator is the unary operator that takes an operand and reverse its logical value.
Syntax for “not” operator:
!expression1
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Starting Out with Java: From Control Structures through Data Structures (4th Edition) (What's New in Computer Science)
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