How does logical and work

This evaluation eliminates needless evaluation of the second operand when the logical AND expression is false. You can use this short-circuit evaluation to prevent null-pointer dereferencing, as shown in the following example:. If pch is null 0 , the right side of the expression is never evaluated. This short-circuit evaluation makes the assignment through a null pointer impossible.

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Privacy policy. Skip to main content. One group uses the relational operators within their expressions and the other group uses logical operators within their expressions.

The logical operators are often used to help create a test expression that controls program flow. This type of expression is also known as a Boolean expression because they create a Boolean answer or value when evaluated. There are three common logical operators that give a Boolean value by manipulating other Boolean operand s. It is just above the Enter key on most keyboards.

It may be a solid vertical line on some keyboards and show as a solid vertical line on some print fonts. This expression has two relational operators and one logical operator.

We can say this in English as: It is true that six is greater than four and that two is less than or equal to fourteen. When forming logical expressions programmers often use parentheses even when not technically needed to make the logic of the expression very clear.

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