Error message

[Latina]

Hi I am doing a program of sets using overloaded methods.
But I am having some error because supposedly the method isValid is
undeclared.
He is some part of my program.

#include <iostream>
#include <string>
#include <iomanip>

using namespace std;

class IntegerSet
{
private:
bool set[26];
int element;

public:
//Methods
IntegerSet(); //default
Constructor
IntegerSet(int x[], int k); //overload
constructor

bool isValue(int);
void insertElement(int);
void deleteElement(int);
void setString();
void inputSet();
};

//methos isValid
bool IntegerSet::isValid(int i)
{
return set[i];
}

Thanks.

[Latina]

On Nov 10, 6:07 pm, Latina <[e-mail]:

Hi I am doing a program of sets using overloaded methods.
But I am having some error because supposedly the method isValid is
undeclared.
He is some part of my program.

#include <iostream>
#include <string>
#include <iomanip>

using namespace std;

class IntegerSet
{
private:
bool set[26];
int element;

public:
//Methods
IntegerSet(); //default constructor
IntegerSet(int x[], int k); //overload constructor

bool isValue(int);
void insertElement(int);
void deleteElement(int);
void setString();
void inputSet();

};

This is the error message pointing where the arrow is:
no `bool IntegerSet::isValid(int)' member function declared in class
`IntegerSet'

//methos isValid
bool IntegerSet::isValid(int i)

--{

return set[i];
}

Thanks.

[Michael]

class IntegerSet

{

<snip>

bool isValue(int);

<snip>

};

//methos isValid
bool IntegerSet::isValid(int i)
{
return set[i];

}

isValue is not the same as isValid. One or the other is misspelled.
Or maybe both.

Michael

[Latina]

isValue is not the same as isValid. One or the other is misspelled.

Or maybe both.

Michael

oops I didnt notice that, thanks
but I still have some other errors.

error: `isValid' undeclared (first use this function)

(where the arrow is pointing)
IntegerSet operator+(IntegerSet &right)
{
IntegerSet j;

for(int element=0; element<=25; element++)
{
-- if(isValid(element) || right.isValid(element))
j.insertElement(element);
}
return j;
}

[Martin Engelmann]

Latina schrieb:

but I still have some other errors.

error: `isValid' undeclared (first use this function)

(where the arrow is pointing)
IntegerSet operator+(IntegerSet &right)
{
IntegerSet j;

for(int element=0; element<=25; element++)
{
-- if(isValid(element) || right.isValid(element))
j.insertElement(element);
}
return j;
}

Is operator+ a member of class IntegerSet? If it is, isValid will be
called with *this. If operator+ is not a member of class IntegerSet you
have to call it with an object.

Martin

[Latina]

On Nov 11, 8:50 am, Martin Engelmann <[e-mail]:

Latina schrieb:

but I still have some other errors.

error: `isValid' undeclared (first use this function)

(where the arrow is pointing)

IntegerSet operator+(IntegerSet &right)
{
IntegerSet j;

for(int element=0; element<=25; element++)
{
-- if(isValid(element) || right.isValid(element))
j.insertElement(element);
}
return j;
}

Is operator+ a member of class IntegerSet? If it is, isValid will be
called with *this. If operator+ is not a member of class IntegerSet you
have to call it with an object.

if i use *this gives me this error
--invalid use of `this' in non-member function

[Martin Engelmann]

Latina schrieb:

On Nov 11, 8:50 am, Martin Engelmann <[e-mail]:

>Latina schrieb:

>>but I still have some other errors.
error: `isValid' undeclared (first use this function)
(where the arrow is pointing)
IntegerSet operator+(IntegerSet &right)
{
IntegerSet j;
for(int element=0; element<=25; element++)
{
-- if(isValid(element) || right.isValid(element))
j.insertElement(element);
}
return j;
}

Is operator+ a member of class IntegerSet? If it is, isValid will be
called with *this. If operator+ is not a member of class IntegerSet you
have to call it with an object.

if i use *this gives me this error
--invalid use of `this' in non-member function

So you should either make operator+ a member function of IntegerSet or
add a second parameter to the function.

IntegerSet IntegerSet::operator+(IntegerSet &right)
(my recommendation)
or
IntegerSet operator+(IntegerSet &left, IntegerSet &right)

When using a non-member function you have to change the condition to
if(left.isValid(element) || right.isValid(element))

[Latina]

On Nov 11, 10:45 am, Martin Engelmann <[e-mail]:

Latina schrieb:

On Nov 11, 8:50 am, Martin Engelmann <[e-mail]:

Latina schrieb:
but I still have some other errors.
error: `isValid' undeclared (first use this function)
(where the arrow is pointing)
IntegerSet operator+(IntegerSet &right)
{
IntegerSet j;
for(int element=0; element<=25; element++)
{
-- if(isValid(element) || right.isValid(element))
j.insertElement(element);
}
return j;
}
Is operator+ a member of class IntegerSet? If it is, isValid will be
called with *this. If operator+ is not a member of class IntegerSet you
have to call it with an object.

if i use *this gives me this error
--invalid use of `this' in non-member function

So you should either make operator+ a member function of IntegerSet or
add a second parameter to the function.

IntegerSet IntegerSet::operator+(IntegerSet &right)
(my recommendation)
or
IntegerSet operator+(IntegerSet &left, IntegerSet &right)

When using a non-member function you have to change the condition to
if(left.isValid(element) || right.isValid(element))- Hide quoted text -

Ok, I declared like this and this is the error I am getting
"expected init-declarator before '+' token ":

class IntegerSet
{
public:
//Operator methods.
IntegerSet &operator+(const IntegerSet &right);
//overloaded operator + to compute the union of two sets
--IntegerSet IntegerSet::perator+(IntegerSet &right)
{
IntegerSet j;

for(int element=0; element<=25; element++)
{
if(isValid(element) || right.isValid(element))
j.insertElement(element);
}
return j;
}

But if I do it like this I am getting the same error
"expected init-declarator before '+' token"

//overloaded operator + to compute the union of two sets
--IntegerSet perator+( &left, IntegerSet &right)
{
IntegerSet j;

for(int element=0; element<=25; element++)
{
if(left.isValid(element) || right.isValid(element))
j.insertElement(element);
}
return j;
}

[Latina]

Ok, I got it but now I am getting this error:
" passing `const IntegerSet' as `this' argument of `bool
IntegerSet::isValid(int)' discards qualifiers "
//overloaded operator + to compute the union of two sets
IntegerSet IntegerSet::operator+(const IntegerSet &right)const
{
IntegerSet j;

for(int element=0; element<=25; element++)
{
-- if(isValid(element) || right.isValid(element))
j.insertElement(element);
}
return j;
}

[Victor Bazarov]

Latina wrote:

Ok, I got it but now I am getting this error:
" passing `const IntegerSet' as `this' argument of `bool
IntegerSet::isValid(int)' discards qualifiers "
//overloaded operator + to compute the union of two sets
IntegerSet IntegerSet::operator+(const IntegerSet &right)const
{
IntegerSet j;

for(int element=0; element<=25; element++)
{
-- if(isValid(element) || right.isValid(element))
j.insertElement(element);
}
return j;
}

Most likely 'isValid' is not declared 'const' (unlike 'operator+'
here, for example)

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask

[Latina]

On Nov 11, 4:14 pm, "Victor Bazarov" <[e-mail]:

Latina wrote:

Ok, I got it but now I am getting this error:
" passing `const IntegerSet' as `this' argument of `bool
IntegerSet::isValid(int)' discards qualifiers "

//overloaded operator + to compute the union of two sets
IntegerSet IntegerSet::operator+(const IntegerSet &right)const
{
IntegerSet j;

for(int element=0; element<=25; element++)
{
-- if(isValid(element) || right.isValid(element))
j.insertElement(element);
}
return j;
}

Most likely 'isValid' is not declared 'const' (unlike 'operator+'
here, for example)

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask- Hide quoted text -

Ok, thanks

[Latina]

I have another error where the arrow is.

Error: " `IntegerSet IntegerSet::operator!(const IntegerSet&)' must
take `void' "

class IntegerSet
{
public:
//Operator methods.
IntegerSet operator + (const IntegerSet &)const; //Method
union
IntegerSet operator * (const IntegerSet &)const; //Method
intersection
-- IntegerSet operator ! (const IntegerSet &)const; //Method
complement

//overloaded operator ! to compute the complent of a set
IntegerSet IntegerSet::operator!(IntegerSet &right)const
{
IntegerSet j;

for(int element=0; element<=25; element++)
{
if(!isValid(element))
j.insertElement(element);
}
return j;
}