hey all im back as usual kicking my head ageist the door
line 41 is giving me a compile error of "cannot declare variable sortItem to be of abstract type" just learning C++ inheritance its a bit different than java. thanks for all the help.

Demo.cpp

/* File Name: Demo.cpp
 Chapter No. 15 - Exercise No. 1
 Programmer:         Carl Sue
 Date Last Modified: Apr 17, 2010
 
 Problem Statement: (what you want the code to do)
 Design a class AbstractSort that can be used to analyze the number of
 comparisons performed by a sorting algorithm. The class should have a
 member function compare that is capable of comparing two array elements,
 and a means of keeping track of the number of comparisons performed.
 The class should be an abstract class with a pure virtual member function
	void sort(int arr[ ], int size)
 which, when overridden, will sort the array by calling the compare function
 to determine the relative order of pairs of numbers. Create a subclass of
 AbstractSort that uses a simple sorting algorithm to implement the sort
 function. The class should have a member function that can be called after
 the sorting is done to retrieve the number of comparisons performed.

 Input validation: do not accept negative numbers for test scores.
 
 
 Overall Plan (step-by-step how you want the code to make it happen):
 1. make an array
 2. sort with a compare class and keep track of comparisons
 3. output number of comparisons done
 etc.
 
 Classes needed and Purpose (Input, Processing, Output):
 
 
 */

#include <iostream>
#include "AbstractSort.h"
#include "SubAbstractSort.h"
using namespace std;

int main(int argc, char * const argv[]){
	int siz = 5;
	int array[] = {1,3,5,9,4};
	SubAbstractSort sortItem;
	sortItem.sort(array,siz);
	cout << "number of compares: " << sortItem.getNumComparisons() << endl;

	return 0;
}



AbstractSort.cpp

/*
 * AbstractSort.cpp
 *
 *  Created on: Apr 23, 2010
 *      Author: Carl
 */

#include "AbstractSort.h"

AbstractSort::AbstractSort() {
	// TODO Auto-generated constructor stub

}

AbstractSort::~AbstractSort() {
	// TODO Auto-generated destructor stub
}

int AbstractSort::getNumConversions(){
	return numConversions;
}

void AbstractSort::setNumConversions(int x){
	numConversions = x;
}

void AbstractSort::incrimentNumConversions(){
	numConversions++;
}

AbstractSort.h

/*
 * AbstractSort.h
 *
 *  Created on: Apr 23, 2010
 *      Author: Carl
 */

#ifndef ABSTRACTSORT_H_
#define ABSTRACTSORT_H_
#include <iostream>
using namespace std;
class AbstractSort {
public:
	AbstractSort();
	virtual void sort(int*arr, int size) = 0;
	virtual ~AbstractSort();
	int getNumConversions();
	void setNumConversions(int);
	void incrimentNumConversions();
private:
	static int numConversions;
};

#endif /* ABSTRACTSORT_H_ */

SubAbstractSort.cpp

/*
 * SubAbstractSort.cpp
 *
 *  Created on: Apr 23, 2010
 *      Author: Carl
 */

#include "SubAbstractSort.h"

SubAbstractSort::SubAbstractSort() {
	numConversions = 0;

}

SubAbstractSort::~SubAbstractSort() {
	// TODO Auto-generated destructor stub
}

void sort(int*arr, int size){

	bool flag = false;
	do {
		for (int i = 0; i < size; i++) {
			if (arr[i]>arr[i+1]) {
				int temp;
				temp = arr[i];
				arr[i] = arr[i+1];
				arr[i+1] = temp;
				flag = true;
				incrimentNumConversions();
			}
		}
	} while (flag == true);

}

SubAbstractSort.h

/*
 * SubAbstractSort.h
 *
 *  Created on: Apr 23, 2010
 *      Author: Carl
 */

#ifndef SUBABSTRACTSORT_H_
#define SUBABSTRACTSORT_H_
#include <iostream>
using namespace std;
#include "AbstractSort.h"

class SubAbstractSort: public AbstractSort {
public:
	SubAbstractSort();
	int getNumComparisons();
	virtual ~SubAbstractSort();
};

#endif /* SUBABSTRACTSORT_H_ */

In SubAbstractSort.cpp, you need to change

void sort(int*arr, int size){

to

void SubAbstractSort::sort(int*arr, int size){

You also need to define the implementation in SubAbstractSort.h

class SubAbstractSort: public AbstractSort {
public:
	SubAbstractSort();
	int getNumComparisons();
	virtual ~SubAbstractSort();
        void sort(int*arr, int size);
};

Hope that helps,

Dave

hmm ok it fixed the on code errors now i have a symbol error still trying to figure what that is been googleing it for other projects

This article has been dead for over six months. Start a new discussion instead.