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Views: 1669 | Replies: 5
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Join Date: May 2006
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Newbie Poster
constructor with an array as an argument Hello,
I think my problem is a simple one (but probably isn't) and something that I have foolishy overlooked. I have created a class (Time) with a constructor that has as its argument a 3x3 int array. It is defined in a header file as follows:
In my program, the constructor is used to initialize the array to all 0's:
Finally, under main() I attempt to instantiate object t of class Time and then use that object to call member functions (t.doMath(array), etc...)
It is here that I run into problems. I get the following error:
`array' undeclared (first use this function)
Any help would be greatly appreciated.
I think my problem is a simple one (but probably isn't) and something that I have foolishy overlooked. I have created a class (Time) with a constructor that has as its argument a 3x3 int array. It is defined in a header file as follows:
public: Time(int [][columns]); //constructor private: int array[rows][columns];
In my program, the constructor is used to initialize the array to all 0's:
Time::Time(int array[][columns]) //time constructor
{
for (int i=0; i<rows; i++)
{
for (int j=0; j<columns; j++)
array[i][j] = 0;
}
}Finally, under main() I attempt to instantiate object t of class Time and then use that object to call member functions (t.doMath(array), etc...)
Time t(array)
It is here that I run into problems. I get the following error:
`array' undeclared (first use this function)
Any help would be greatly appreciated.
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Join Date: Apr 2004
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Originally Posted by jaden403
I get the following error:
`array' undeclared (first use this function)
Any help would be greatly appreciated.
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Join Date: May 2006
Posts: 17
Reputation:
Rep Power: 3
Solved Threads: 0
Newbie Poster
Sir,
First, thank you for your response.
Second, I was under the assumption that if an array (or variable) was declared public in the class definition that one was not required to declare it again in main(). I see now that assumption was incorrect.
Correct me if I am wrong here: only those arrays/variables explicitly passed to a class defined member function can be placed into either public or private. All other arrays/variables must be declared in main() - or such as the case may be. Is that correct?
First, thank you for your response.
Second, I was under the assumption that if an array (or variable) was declared public in the class definition that one was not required to declare it again in main(). I see now that assumption was incorrect.
Correct me if I am wrong here: only those arrays/variables explicitly passed to a class defined member function can be placed into either public or private. All other arrays/variables must be declared in main() - or such as the case may be. Is that correct?
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Join Date: Apr 2004
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Originally Posted by jaden403
Correct me if I am wrong here: only those arrays/variables explicitly passed to a class defined member function can be placed into either public or private. All other arrays/variables must be declared in main() - or such as the case may be. Is that correct?
It would seem that you don't want to pass any parameters to your constructor.
const int rows = 3;
const int columns = 4;
class Time
{
int array[rows][columns];
public:
Time();
};
Time::Time()
{
for ( int i = 0; i < rows; ++i )
{
for ( int j = 0; j < columns; ++j )
{
array[i][j] = 0;
}
}
}
int main()
{
Time t();
// ...
}[edit]Gah! Let's make a little change to main, too.
http://parashift.com/c++-faq-lite/ctors.html#faq-10.2
int main()
{
Time t;
// ...
} Last edited by Dave Sinkula : May 30th, 2006 at 10:43 am.
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Join Date: May 2006
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Newbie Poster
This helps...thanks!
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