What is the difference between bool and Boolean types in C

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They are the same  Bool is just System Boolean shortened  Use Boolean when you are with a VB net programmer  since it works with both C  and Vb

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They are the same   Boolean helps simplify conversion back and forth between C  and VB Net   Most C  programmers tend to prefer  bool   but if you are in a shop where there s a lot of both VB Net and C  then you may prefer Boolean because it works in both places

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I realise this is many years later but I stumbled across this page from google with the same question   There is one minor difference on the MSDN page as of now   VS2005     Note       If you require a Boolean variable that can also have a value of null  use bool    For more information  see Nullable Types  C  Programming Guide     VS2010     Note       If you require a Boolean variable that can also have a value of null  use bool     For more information  see Nullable Types  C  Programming Guide

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They are one in the same   bool is just an alias for Boolean

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bool is an alias for Boolean  What aliases do is replace one string of text with another  like search replace-all in notepad     just before the code is compiled  Using one over the other has no effect at run-time   In most other languages  one would be a primitive type and the other would be an object type  value type and reference type in C  jargon   C  does not give you the option of choosing between the two  When you want to call a static method defined in the Boolean class  it auto-magically treats Boolean as a reference type   If you create a new Boolean variable  it auto-magically treats it as a reference type  unless you use the Activator CreateInstance method

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Perhaps bool is a tad  lighter  than Boolean  Interestingly  changing this   namespace DuckbillServerWebAPI Models       public class Expense                             public bool CanUseOnItems   get  set                 to this   namespace DuckbillServerWebAPI Models       public class Expense                             public Boolean CanUseOnItems   get  set                 caused my cs file to sprout a  using System   Changing the type back to  bool  caused the using clause s hair to turn grey    Visual Studio 2010  WebAPI project

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As has been said  they are the same  There are two because bool is a C  keyword and Boolean a  Net class

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Note that Boolean will only work were you have using System   which is usually  but not necessarily  included   unless you write it out as System Boolean    bool does not need using System

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One is an alias for the other

User · Answer

bool is an alias for System Boolean just as int is an alias for System Int32  See a full list of aliases here  Built-In Types Table  C  Reference

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bool is a primitive type  meaning that the value  true false in this case  is stored directly in the variable   Boolean is an object   A variable of type Boolean stores a reference to a Boolean object   The only real difference is storage   An object will always take up more memory than a primitive type  but in reality  changing all your Boolean values to bool isn t going to have any noticeable impact on memory usage    I was wrong  that s how it works in java with boolean and Boolean   In C   bool and Boolean are both reference types   Both of them store their value directly in the variable  both of them cannot be null  and both of them require a  convertTO  method to store their values in another type  such as  int    It only matters which one you use if you need to call a static function defined within the Boolean class

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bool is an alias for the Boolean class  I use the alias when declaring a variable and the class name when calling a method on the class

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No actual difference unless you get the type string  There when you use reflection or GetType   you get  Name    quot Boolean quot  FullName    quot System Boolean quot   for both

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I don t believe there is one   bool is just an alias for System Boolean

User · Answer

There is no difference -  bool is simply an alias of System Boolean   http   msdn microsoft com en-us library c8f5xwh7 VS 71  aspx

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