Change array values

[confusedengstudent]

How can i change a specific value in an array, if there is already a value at that location?
After printing the array again, no values are changed.

int corchoice, k, l, i ,j;
for (i = 6; i >= 0; i--)
	{ 
		cout << endl;
		for (j = 0; j < maxc; j++)
		{
			if (np[i][j] == -1)
				cout << "   ";
			else
				cout << setw(6) << np[i][j];
		}
	}

	cout << endl << "Is this pyramid correct?(yes = 1/no = 2)" << endl;
		cin >> corchoice;

		while (corchoice != 1)
		{
		cout << "please enter the row of the incorrect number." << endl;
		cin >> k;
		cout << "please enter the column of the incorrect number." << endl;
		cin >> l;
		cout << "Please enter a integer for the array number: " << "[" << k << "]" << "[" << l << "]" << endl;
		cin >> np[k][l];
		cout << endl;

for (i = 6; i >= 0; i--)
	{ 
		cout << endl;
		for (j = 0; j < maxc; j++)
		{
			if (np[i][j] == -1)
				cout << "   ";
			else
				cout << setw(6) << np[i][j];
		}
	}

		cout << endl;
		cout << "Is this pyramid correct?(yes = 1/no = 2)" << endl;
		cin >> corchoice;
		}

[MRQ1]

If I understood correctly you can change the specific value by using its index like I did in this program.

#include<iostream>

using namespace std;

int main()
{

int array[]={2,3,5};

for (int i=0 ; i<3 ; i++)
{
	cout<<array[i]<<endl;

}

array[1]=8;

for (int j=0;j<3;j++)
{
	cout<<array[j]<<endl;
}
cin.get();
cin.ignore();
return 0;
}