2D danamic arrays, how to create and give values(i,j)

[arashe]

I cant get with part of it is wrong, i want to sum every row, too.

// Color Number.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include<conio.h>
#include<iostream>
#include <stdlib.h>
#include <string.h>
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
	int k,sum;
	cout << "Enter the Graph vertex number: ";
	cin >> k;
	int i, j, *a, b[100];
	a = new int [i][j];
	cout << "your Gragh is" << k << " , " << k << ", enter your numbers:"<< endl;
	for (i = 0; i<k; i++)
	{
		for (j = 0; j<k; j++)
		{
			cout << "[ " << i + 1 << " , " << j + 1 << " ] = ";
			cin >> a[i*j];
		}
		cout << endl;
	}
	for (i = 0; i<k; i++)
	{
		for (j = 0; j<k; j++)
		{
		sum += a[j];
		}
		b[i] = sum;
		cout << b[i];
		sum = 0;
	}
	return 0;
}

[zmbd]

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