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help me in c++
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Hello please help me
I want to declare object of base class above function main or global variable( object)
and use this object in derived class like this:
class X
{
...
}
class y : public X
{
void func();
}
void y::func()
{
a[1][0] = &c; //compiler error: a[1][0] undeclared identifier
}
////////////////////////
X* arr[8][8];
void main()
{
...
}
----------------------------
how can i do this?
because when i define like this compiler error that a[1][0] undeclared identifier
I want to declare object of base class above function main or global variable( object)
and use this object in derived class like this:
class X
{
...
}
class y : public X
{
void func();
}
void y::func()
{
a[1][0] = &c; //compiler error: a[1][0] undeclared identifier
}
////////////////////////
X* arr[8][8];
void main()
{
...
}
----------------------------
how can i do this?
because when i define like this compiler error that a[1][0] undeclared identifier
I'm guessing you actually have ... in your source instead of actual code. a and c are not anywhere to be found. Provide the full source code and we can help you. Also, use code tags and void main is now int main.
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Originally Posted by Grigor 
I'm guessing you actually have ... in your source instead of actual code. a and c are not anywhere to be found. Provide the full source code and we can help you. Also, use code tags and void main is now int main.
Last edited by csurfer; Jul 12th, 2009 at 9:17 am.
I Surf in "C"....
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@thr:
A function in class y can work on variables declared in class y or the public variables in class x or the global variables(Usage of global variables is not recommended.).But I think you want to use the pointer to objects of class x which you have declared as
A function in class y can work on variables declared in class y or the public variables in class x or the global variables(Usage of global variables is not recommended.).But I think you want to use the pointer to objects of class x which you have declared as
X *arr[10][10] But you are using a[][] instead of arr[][] inside the function c++ Syntax (Toggle Plain Text)
Last edited by csurfer; Jul 12th, 2009 at 9:18 am.
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>>//compiler error: a[1][0] undeclared identifier
Another reason for that error that no one has mentioned is that the class is attempting to use that array before it has been declared. If the class is in a header file then you will also have to put the array declaration there. The easiest way to do that is to make the array a static member of class Y. If you don't want to do that then you will have to do something like this:
Another reason for that error that no one has mentioned is that the class is attempting to use that array before it has been declared. If the class is in a header file then you will also have to put the array declaration there. The easiest way to do that is to make the array a static member of class Y. If you don't want to do that then you will have to do something like this:
C++ Syntax (Toggle Plain Text)
Last edited by Ancient Dragon; Jul 12th, 2009 at 10:11 am.
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Originally Posted by csurfer
@thr:
A function in class y can work on variables declared in class y or the public variables in class x or the global variables(Usage of global variables is not recommended.).But I think you want to use the pointer to objects of class x which you have declared asX *arr[10][10]But you are usinga[][]instead ofarr[][]inside the function
c++ Syntax (Toggle Plain Text)
void func()
{
arr[0][1] = &c; // compiler error to this line arr no declarade
}
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Originally Posted by thr
excuse me i have a problem in writting above code i use arr[][] in func():
void func()
{
arr[0][1] = &c; // compiler error to this line arr no declarade
}
c++ Syntax (Toggle Plain Text)
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