Boolean values: Difference between revisions
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m (→{{header|Phix}}: conversely not "=true") |
m (C# Removed the remark about C#8 nullable types because it does not apply to bool.) |
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=={{header|C sharp|C#}}== |
=={{header|C sharp|C#}}== |
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In C#, there are the reserved keywords <code>true</code> and <code>false</code>. Variables to hold these values are declared as either <code>bool</code> or <code>Boolean</code>. These types are identical, as <code>bool</code> is just |
In C#, there are the reserved keywords <code>true</code> and <code>false</code>. Variables to hold these values are declared as either <code>bool</code> or <code>Boolean</code>. These types are identical, as <code>bool</code> is just shorthand for <code>Boolean</code>. The collection type <code>BitArray</code> returns its values as <code>Boolean</code>, packing 8 values into each byte (In contrast, the <code>Boolean</code> type uses the entire byte for one value). |
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There is also the <code>Nullable<T></code> type that represents all values of its underlying value type <code>T</code> and an additional <code>null</code> value. It has a shorthand notation: <code>T?</code> (When <code>T</code> is a reference type, <code>T?</code> means something else. It is not a different type, but just a hint to the compiler.) |
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So, when applied to <code>bool</code>, we have a <code>bool?</code> type that supports 3 values: <code>true</code>, <code>false</code> and <code>null</code>. This can be useful for some applications where the value can be undefined or missing. |
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<lang csharp>bool? value = null</lang> |
<lang csharp>bool? value = null</lang> |
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