Help...Operator Overloading...Problem

[titan0111@hotmail.com]

----inside of class called snowfall, i wrote----

int operator == (char[]);


----and right before main() i wrote----

int snowfall::opera tor == (char str[])

// comparing two member data (dates)

{
return (strcmp(date, str) == 0) ? 1 : 0;
}


----inside of main i called it----

while (sf[i].getdate() != "00/00")
{...}

i was told that this won't work. can you tell me what's wrong?
and give me the correct way to write it?

[Ron Natalie]

Re: Help...Operator Overloading...P roblem

titan0111@hotma il.com wrote:[color=blue]
> ----inside of class called snowfall, i wrote----
>
> int operator == (char[]);
>
>[/color]
[color=blue]
> while (sf[i].getdate() != "00/00")
> {...}
>
> i was told that this won't work. can you tell me what's wrong?
> and give me the correct way to write it?
>[/color]
== and != are two distinct operators. You defined one but
are using the other.

[Victor Bazarov]

Re: Help...Operator Overloading...P roblem

titan0111@hotma il.com wrote:[color=blue]
> ----inside of class called snowfall, i wrote----
>
> int operator == (char[]);[/color]

Make it

bool operator==(cons t char*) const;
[color=blue]
>
>
> ----and right before main() i wrote----
>
> int snowfall::opera tor == (char str[])[/color]

bool snowfall::opera tor == (char const *str) const
[color=blue]
>
> // comparing two member data (dates)
>
> {
> return (strcmp(date, str) == 0) ? 1 : 0;[/color]

return strcmp(date, str) == 0;
[color=blue]
> }
>
>
> ----inside of main i called it----
>
> while (sf[i].getdate() != "00/00")
> {...}
>
> i was told that this won't work. can you tell me what's wrong?[/color]

Not with much assuredness lacking the definition of 'snowfall' type
and the declaration of 'sf' here. But I suspect the idea is to do

while (sf[i] != "00/00")
[color=blue]
> and give me the correct way to write it?[/color]

See above. And next time read the FAQ.

V

[Victor Bazarov]

Re: Help...Operator Overloading...P roblem

Victor Bazarov wrote:[color=blue]
> titan0111@hotma il.com wrote:[/color]
[...][color=blue][color=green]
>> ----inside of main i called it----
>>
>> while (sf[i].getdate() != "00/00")
>> {...}
>>
>> i was told that this won't work. can you tell me what's wrong?[/color]
>
>
> Not with much assuredness lacking the definition of 'snowfall' type
> and the declaration of 'sf' here. But I suspect the idea is to do
>
> while (sf[i] != "00/00")[/color]

And, yes, I missed the fact that you're using != having defined ==.
Ron is right. Pay attention what operator you're using.

V

[titan0111@hotmail.com]

Re: Help...Operator Overloading...P roblem

---in class i changed to----

int operator != (char[]);

---right after class i changed difinition to----

int snowfall::opera tor != (char str[])

// overloading operator = to compare two strings

{
return (strcmp(date, str) == 0) ? 0 : 1;
}

----in main() i wrote----
while (sf[i].getdate() != "00/00")

and it won't still work....

[Victor Bazarov]

Re: Help...Operator Overloading...P roblem

titan0111@hotma il.com wrote:[color=blue]
> ---in class i changed to----
>
> int operator != (char[]);
>
> ---right after class i changed difinition to----
>
> int snowfall::opera tor != (char str[])
>
> // overloading operator = to compare two strings
>
> {
> return (strcmp(date, str) == 0) ? 0 : 1;
> }
>
> ----in main() i wrote----
> while (sf[i].getdate() != "00/00")
>
> and it won't still work....
>[/color]

Read the FAQ 5.8 (http://www.parashift.com/c++-faq-lite/)

V

[Karl Heinz Buchegger]

Re: Help...Operator Overloading...P roblem

titan0111@hotma il.com wrote:[color=blue]
>
> ---in class i changed to----
>
> int operator != (char[]);
>
> ---right after class i changed difinition to----
>
> int snowfall::opera tor != (char str[])
>
> // overloading operator = to compare two strings
>
> {
> return (strcmp(date, str) == 0) ? 0 : 1;
> }
>
> ----in main() i wrote----
> while (sf[i].getdate() != "00/00")
>
> and it won't still work....[/color]

Then please tell us what 'does not work' means!
Do you get an error message from the compiler? If yes,
which one?

--
Karl Heinz Buchegger
kbuchegg@gascad .at