creating new objects in loop

This is a discussion on creating new objects in loop within the C++ Programming forums, part of the General Programming Boards category; I'm trying to figure out how to create new objects based on user input. Here is a sample output to ...

  1. #1
    Registered User
    Join Date
    Apr 2004
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    5

    creating new objects in loop

    I'm trying to figure out how to create new objects based on user input. Here is a sample output to help my description:

    Enter value for object: 4 // this would set a value for object1 as 4
    Do you want to enter another? yes
    Enter value for object: 3 // this would set a value for object2 as 3
    repeat...

    Here is what I have without any logic for creating the new object in the loop (this program just overwrites the "object" object in each loop instead of making object1, object2, object3 etc...:

    Thanks for your time
    Hail to the Redskins.

    Code:
    #include <iostream> 
    using namespace std; 
    
    class CRecord
    {
    public:
    	CRecord();		//default constructor
    	int getnum();	//get function
    	int num;
    };
    
    CRecord::CRecord() //default constructor
    {	
    	num=0;
    }
    
    int CRecord::getnum() // a get utility function
    {
    	return num;
    }
    
    
    
    int main()
    {
    	int counter =1;
    	
    	while ( counter <= 5 ) {
    	
    		CRecord object;
    	
    		cout << "enter value for object: " ;
    		cin >> object.num;
    		cout << endl << object.getnum() << endl;
    		counter++;	
    	}
    
    	return 0;
    
    }

  2. #2
    Senior Member joshdick's Avatar
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    Phildelphia, PA
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    1,146
    Don't make data members public within a class. Make them private (or protected) and then overload the input operator.
    FAQ

    "The computer programmer is a creator of universes for which he alone is responsible. Universes of virtually unlimited complexity can be created in the form of computer programs." -- Joseph Weizenbaum.

    "If you cannot grok the overall structure of a program while taking a shower, you are not ready to code it." -- Richard Pattis.

  3. #3
    Registered User jlou's Avatar
    Join Date
    Jul 2003
    Posts
    1,088
    If you want different objects, you must keep track of the different objects. In your example, you only create one object at a time. Technically speaking, you create 5 objects, but each one goes away before you create the next one.

    One solution is a vector or array of CRecord objects. In your code example you would make it a size of 5 and create it before your loop. Then, use the counter variable to index the array and set the values appropriately. Be careful, though, because you start counter at 1 and arrays are indexed from 0 to size-1.

  4. #4
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    Smile

    Thanks guys, - I think I see the light. I'll try the array of objects and reply again if I have more questions.

    I kept everything public because I was trying to make keep my example code simple.

    Thanks so much for your time.

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