Function call

[ZIPB]

Can anyone tell how to call a class function from a switch statement

example

number number::operator+(number)
                 {
                    inputs
                    }

switch (option)
       {
         case 1:
              number number::operator+(number);
              break;

IS THAT THE CORRECT WAY TO CALL THE ABOVE FUNCTION?

[VernonDozier]

Not sure what you are trying to do. You'll have to provide a more in-depth example. Here's a link to an example on how to overload the + operator and how to call it. Scroll to the bottom.

http://msdn.microsoft.com/en-us/library/5tk49fh2%28VS.80%29.aspx

[ZIPB]

class number
{
private:

int Num1, Num2;
public:
number(int, int);
number operator+(number);
number operator-(number);
number operator/(number);
};

number number::operator+(number)
{
inputs
}

number number::operator-(number)
{
inputs
}

number number::operator/(number)
{
inputs
}

cout << "1 addition"<<endl;
cout << "2 subtraction"<<endl;
cout << "3 division"<<endl;

int option;

switch (option)
{
case 1:
number number::operator+(number)
break;

case 1:
number number::operator-(number)
break;

case 3:
number number::operator/(number)
break;

default:
cout<<"Invalid Option";
break;
}

I want to know is that the correct way to call the Class functions

[WaltP]

Calling a class function is identical to calling a regular function.

Please learn to format your code to make it understandable and use CODE Tags.

[VernonDozier]

Presumably if you had three objects of type number(number1, number2, number3), you would call the operator like this:

number3 = number1 + number2;

Get rid of the words "operator" and "number" and get rid of the "::" in the call.

[ZIPB]

so basicall what you are saying is that

number3 = number1 + number2; would call this function

#
number number::operator+(number)

{

inputs

}

[VernonDozier]

so basicall what you are saying is that

number3 = number1 + number2; would call this function

#
number number::operator+(number)

{

inputs

}

number1 + number2

calls the function. Adding "number3 = " in front harnesses the return value and sticks it into an object you can use later. You'll want to write an assignment (=) operator too, and constructors, stuff like that.

You might as well just write the function rather than do this:

number number::operator+(number)
{
inputs
}

It's a short enough function to write presumably and it lessens the confusion. "inputs" doesn't make any sense to me here. And I would imagine it actually looks more like this:

number number::operator(const number& aNumber) const
{
    // code here
}

Google "C++ operator overloading tutorial" for some good examples.

[ZIPB]

yes you're correct but the question is, Whats the syntax to call the function in the switch statement?

cout << "1 addition"<<endl;
cout << "2 subtraction"<<endl;
cout << "3 division"<<endl;

int option;

switch (option)
{
case 1:
number number::operator+(number)
break;

case 1:
number number::operator-(number)
break;

case 3:
number number::operator/(number)
break;

default:
cout<<"Invalid Option";
break;
}

WOULD THE ABOVE SYNTAX BE THE CORRECT WAY?

[VernonDozier]

I already answered that question earlier. No it would not be the correct syntax. Correct syntax would be this, assuming number1, number2, number3 are number objects:

number1 = number2 + number3;

Read my earlier post. In particular, this part of the post:

Get rid of the words "operator" and "number" and get rid of the "::" in the call.

Also note Walt P's post. Inside of a switch, outside of a switch, it doesn't matter. It's the same syntax. A call is a call and you don't need the word "number" in the call and you don't need the "::" in the call.