Adding 858993460 to get the write answer?

[TieRein]

My code works beautifully. I needed to add and multiply matrix strings.
However! I have no idea why I have to add 858993460 to my "Matrixmulti" code for it to work. Any ideas? I'm thinking that number is equal to NULL but im pretty new to this.

/*
Name: Jacob Chesley
Date started: 3/4/15
Date last edited: 3/4/15
Name of file: Matrix operations
Name of project: Matrix operations
*/

#include <iostream>

using std::cout;
using std::cin;
using std::endl;

const int SIZE = 3;
void matrixmulti(int matrixtimes[SIZE][SIZE], int matrix1[SIZE][SIZE], int matrix2[SIZE][SIZE])
{

	for (int i = 0; i < SIZE; i++)
	{
		for (int q = 0; q < SIZE; q++)
		{

			for (int h = 0; h < SIZE; h++)
			{
				matrixtimes[i][q] += matrix1[i][h] * matrix2[h][q];
			}
			cout << "Matrix" << i << q << " equals: " << matrixtimes[i][q] + 858993460 << endl;
		}
	}
}
void matrixaddition(int matrixadd[SIZE][SIZE], int matrix1[SIZE][SIZE], int matrix2[SIZE][SIZE])
{

	for (int i = 0; i < SIZE; i++)
	{
		for (int q = 0; q < SIZE; q++)
		{
			matrixadd[i][q] = matrix1[i][q] + matrix2[i][q];
			cout << matrix1[i][q] << " plus " << matrix2[i][q] << " equals: " << matrixadd[i][q] << endl;
		}
	}
}

int main()
{
	int matrixadd[SIZE][SIZE],
		matrix1[SIZE][SIZE],
		matrix2[SIZE][SIZE],
		matrixtimes[SIZE][SIZE];
	for (int i = 0; i < SIZE; i++)
	{
		for (int q = 0; q < SIZE; q++)
		{
			cout << "Please enter matrixone" << i << q << ": ";
			cin >> matrix1[i][q];
			cout << endl;
			cout << "Please enter matrixtwo" << i << q << ": ";
			cin >> matrix2[i][q];
			cout << endl;
		}
	}
	matrixaddition(matrixadd, matrix1, matrix2);
	matrixmulti(matrixtimes, matrix1, matrix2);
	return 0;
}

[TieRein]

Also, any recommendations to make this code just a little better? This is extra credit work so I just want to make it look pretty.

[TieRein]

Figured it out. I forgot to initialize my matrix strings.