Default Param in VC++







Declaration :

void AddVal(int iFirstVal, int iSecondVal=0);




Definition

void AddVal(int iFirstVal, int iSecondVal)

{

int iVal = iFirst+iSecond;

    cout << "Sum : " << iVal << endl;

}

int main()

{

    AddVal(1); // nValue2 will use default parameter of 10

    AddVal(3, 4); // override default value for nValue2

}




1. Default Parameter should be last parameter.[Otherwise hot compiler will know which attributes should be omit.]

2. No default value allowed in definition. Default value should be given only in declaration.

3. Default arguments can be provided for pointers to functions. For example:

int (*pShowIntVal)( int i = 0 );