class arrays~

This is a discussion on class arrays~ within the C++ Programming forums, part of the General Programming Boards category; As known we could initialize an array like this: PHP Code: int arr [ 5 ]={ 1 , 2 , 3 ...

  1. #1
    flashing vampire black's Avatar
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    class arrays~

    As known we could initialize an array like this:
    PHP Code:
    int arr[5]={1,2,3,4,5}; 
    and I got it from my book array could also be operated with class, that should be something like this:
    PHP Code:
    class people{...};
    const 
    int amout=5000  //I think we should have almost 5000 guys here, ya~
    people cprogramming[amout]; 
    it works and...... my question is could we initialize the arry cprogramming in the same line declared ? just as the arr on top.

    any ideas ?
    Never end on learning~

  2. #2
    Registered User
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    You mean like this? Sorry for my sloppy programming I just through this together to convey the message.

    Code:
    #include <iostream>
    using namespace std;
    
    class CPoint
    {
    	private:
    		int m_x;
    		int m_y;
    	public:
    		CPoint( ); 
    		CPoint( int x, int y ) : m_x( x ), m_y( y ) { }
    		inline void Display( void )
    		{
    			cout << m_x << endl;
    			cout << m_y << endl;
    		}
    };
    
    int main( void )
    {
    	CPoint PointArray[ ] = { CPoint(1,2), CPoint(2,3) };
    	PointArray[0].Display();
    	PointArray[1].Display();
    	
    
    	return 0;
    }
    "...the results are undefined, and we all know what "undefined" means: it means it works during development, it works during testing, and it blows up in your most important customers' faces." --Scott Meyers

  3. #3
    flashing vampire black's Avatar
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    this line below confused me a little, any explaination please ?

    PHP Code:
    CPointint xint y ) : m_x), m_y) { } 
    Never end on learning~

  4. #4
    TK
    Guest
    I think that you might want to try dynamically allocating the array instead of using static allocation. To dynamically allocate an array you use the 'new' operator.

  5. #5
    flashing vampire black's Avatar
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    Originally posted by TK
    I think that you might want to try dynamically allocating the array instead of using static allocation. To dynamically allocate an array you use the 'new' operator.
    oh, thanx. I know not much about it, where is my book ? I need it now~~~
    Never end on learning~

  6. #6
    Seeking motivation... endo's Avatar
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    Originally posted by black
    this line below confused me a little, any explaination please ?

    PHP Code:
    CPointint xint y ) : m_x), m_y) { } 

    Its a different means of initialising data members, and the only way to initialise const data members. Its equivalent to the code shown below, but is possibly a little bit quicker and more efficient.

    Code:
    CPoint::CPoint( int x, int y )
    {
         m_x = x;  //bah!!! Hungarian :(
         m_y = y;
    }

  7. #7
    TK
    Guest
    I just think that you are asking the question wrong Black. What you want to know is how to determine the size of the array at runtime. That is what you are wondering about.

  8. #8
    TK
    Guest
    Code:
    #include<iostream>
    #include<algorithm>
    #include<iomanip>
    #include<string>
    #include<vector>
    
    using std::cin;
    using std::cout;
    
    int main()
    {
      int * pint;
      int icount;
    
      cout << "How many numbers do you want to enter? ";
      cin >> icount;
    
      pint = new int[icount];
      int i;
    
      for ( i = 0; i < icount; ++i)
        {
          cout << "Enter number " << i + 1 << ": ";
          cin >> pint[i];
        }
    
      cout << "The numbers you entered are:" << endl;
      for ( i = 0; i < icount; ++i)
        {
          cout << pint[i] << endl;
        }
    
      delete []pint;
    
      return 0;
    }

  9. #9
    flashing vampire black's Avatar
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    Originally posted by TK
    I just think that you are asking the question wrong Black. What you want to know is how to determine the size of the array at runtime. That is what you are wondering about.
    that should be Dynamic Memory, yes ? I am reading something these days, hope all would be clear soon. thanx, TK~

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