Question

I have a constructor declaration as:

MyConstuctor(int inDenominator, int inNumerator);

and definition as

MyConstuctor::MyConstuctor(int inDenominator,
    int inNumerator, int inWholeNumber = 0)
{
    mNum = inNumerator;
    mDen = inDenominator;
    mWhole = inWholeNumber;
}

but i want to have an option of passing whole number as third parameter depending on caller object. is this the right way. if not what can be the alternative way.

Answer 1

What you need is:

//declaration:
MyConstuctor(int inDenominator, int inNumerator, int inWholeNumber = 0); 

//definition:
MyConstuctor::MyConstuctor(int inDenominator,int inNumerator,int inWholeNumber) 
{   
    mNum = inNumerator;   
    mDen = inDenominator;   
    mWhole = inWholeNumber;   
}

This way you will be able to provide a non-default value for inWholeNumber; and you will be able not to provide it so 0 will be used as the default.

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As an additional tip, better use initialization list in the definition:

//definition:
MyConstuctor::MyConstuctor(int inDenominator,int inNumerator,int inWholeNumber) :
    mNum(inNumerator), mDen(inDenominator), mWhole (inWholeNumber)
{   
}