C# Logical Operator

In C#, logical operators are used to combine boolean expressions and determine whether a certain condition is true or false. The basic logical operators in C# are:

• && (logical AND)
• || (logical OR)
• ! (logical NOT)

Here are some examples of how to use logical operators in C#:

bool x = true;
bool y = false;

bool result1 = x && y;    // result1 is false
bool result2 = x || y;    // result2 is true
bool result3 = !x;    // result3 is false
bool result4 = !(x && y);    // result4 is true

The && operator returns true if both of its operands are true. If either operand is false, the result is false.

The || operator returns true if at least one of its operands is true. If both operands are false, the result is false.

The ! operator (logical NOT) reverses the value of its operand. If the operand is true, the result is false. If the operand is false, the result is true.

Note that logical operators can be combined to form more complex expressions. When evaluating a logical expression, C# uses short-circuit evaluation, which means that it stops evaluating as soon as the result is determined. For example, if the first operand of the && operator is false, the second operand is not evaluated, because the result of the expression will always be false.

bool x = true;
bool y = false;

bool result = x || (y && SomeFunction());    // SomeFunction() is not called if y is false

Logical operators are commonly used in conditional statements and loops to control the flow of a program based on the result of boolean expressions. It's important to understand how to use logical operators correctly and to be aware of the potential for errors or unexpected results when combining boolean expressions.