C# bool

Summary: in this tutorial, you’ll learn about the C# bool type that represents boolean values, true and false.

Introduction to the C# bool type

C# use the bool keyword to represent the boolean type with two values: true and false. A variable of the bool type can hold one of these two values.

For example, the following declares two variables with the bool type:

bool canVote = true;
bool open = false;Code language: C# (cs)

Note that the true and false are two boolean literal values.

When comparing two values using the comparison or equality operators, you’ll get a value of the bool type.

For example, the following expression uses the > operator to compare two numbers; The type of the result is bool:

bool result = 10 > 20;
Console.WriteLine(result);Code language: C# (cs)

Output:

FalseCode language: C# (cs)

Likewise, the following expression uses the == operator to compare two strings and returns true:

bool result = "One" == "One";
Console.WriteLine(result);Code language: C# (cs)

Output:

TrueCode language: C# (cs)

In practice, you’ll use the boolean values in the if, do, while, and for statement and in the ternary operator ?:.

Technically, the bool type is an alias for the .NET System.Boolean structure type.

Summary

• Use the bool keyword to declare a boolean variable that can hold one of two values: true and false.
• The result of expressions that uses comparison or equality operators has the type bool.