Can I give a default value to parameters or optional parameters in C functions

Question

Can I give default parameters in C    In C   void fun int i   1        printf   d   i       Can we give parameters a default value  Is it possible in C   If so  can we avoid overloading functions   It s always a bad practice to add an optional parameter to an existing function  If you are working on a project which is having to refer the class having a function and we changed a parameter with an optional value  it may throw a run time exception that the method is not found   This is because we will consider that the if we add an extra optional value  there is no code change required if the function is used in many places   function Add int a  int b     This will be called using this way   Add 10  10     But if we add an optional parameter like this   function Add int a  int b  int c   0     then the compiler expects  Add 10  10  0     Actually we are calling like this Add 10  10  and this function won t be available in that class and causes a run time exception   This happens for while adding a new parameter to a function which called by a lot of places and I not sure this will happen every time  But I suggest you to overload the function   Always we need to overload the method which has an optional parameter  Also if you are working with functions having more than one optional parameter  then it s good to pass the value using the name of the parameter   function Add int a  int b  int c   0     It s always good to call this function using the following way   Add 10  20  c 30

User · Accepted Answer

That is exactly how you do it in C   but the feature was first added in  NET 4 0

User · Answer

Yes  See Named and Optional Arguments  Note that the default value needs to be a constant  so this is OK   public string Foo string myParam    default value      constant  OK       but this is not   public void Bar string myParam   Foo       not a constant  not OK

User · Answer

This is a feature of C  4 0  but was not possible without using function overload prior to that version

User · Answer

This functionality is available from C  4 0 - it was introduced in Visual Studio 2010  And you can use it in project for  NET 3 5  So there is no need to upgrade old projects in  NET 3 5 to  NET 4 0     You have to just use Visual Studio 2010  but remember that it should compile to default language version  set it in project Properties- Buid- Advanced      This MSDN page has more information about optional parameters in VS 2010

User · Answer

It is only possible as from C  4 0  However  when you use a version of C   prior to 4 0  you can work around this by using overloaded methods   public void Func  int i  int j         Console WriteLine  String Format   i    0   j    1    i  j       public void Func  int i         Func  i  4      public void Func          Func  5        Or  you can upgrade to C  4 0 offcourse

User · Answer

Yes  but you ll need to be using  NET 3 5 and C  4 0 to get this functionality   This MSDN page has more information

[c#] Can I give a default value to parameters or optional parameters in C# functions?

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