1. Enter matrix size.
2. Enter matrix A.
3. Enter matrix B.
4. Write matrices to file.
5. Read matrices from file.
6. Print sum of matrices.
7. Print product of matrices.
8. Quit.
> Enter new matrix size. 
1. Enter matrix size.
2. Enter matrix A.
3. Enter matrix B.
4. Write matrices to file.
5. Read matrices from file.
6. Print sum of matrices.
7. Print product of matrices.
8. Quit.
> Enter the 4 values for the matrix going across rows.
1. Enter matrix size.
2. Enter matrix A.
3. Enter matrix B.
4. Write matrices to file.
5. Read matrices from file.
6. Print sum of matrices.
7. Print product of matrices.
8. Quit.
> Enter the 4 values for the matrix going across rows.
1. Enter matrix size.
2. Enter matrix A.
3. Enter matrix B.
4. Write matrices to file.
5. Read matrices from file.
6. Print sum of matrices.
7. Print product of matrices.
8. Quit.
> What file do you want to save them to?
1. Enter matrix size.
2. Enter matrix A.
3. Enter matrix B.
4. Write matrices to file.
5. Read matrices from file.
6. Print sum of matrices.
7. Print product of matrices.
8. Quit.
> 4.000000 9.000000 
7.000000 6.000000 
1. Enter matrix size.
2. Enter matrix A.
3. Enter matrix B.
4. Write matrices to file.
5. Read matrices from file.
6. Print sum of matrices.
7. Print product of matrices.
8. Quit.
> 28.000000 22.000000 
22.000000 16.000000 
1. Enter matrix size.
2. Enter matrix A.
3. Enter matrix B.
4. Write matrices to file.
5. Read matrices from file.
6. Print sum of matrices.
7. Print product of matrices.
8. Quit.
> What file do you want to load from?
1. Enter matrix size.
2. Enter matrix A.
3. Enter matrix B.
4. Write matrices to file.
5. Read matrices from file.
6. Print sum of matrices.
7. Print product of matrices.
8. Quit.
> 4.000000 9.000000 
7.000000 6.000000 
1. Enter matrix size.
2. Enter matrix A.
3. Enter matrix B.
4. Write matrices to file.
5. Read matrices from file.
6. Print sum of matrices.
7. Print product of matrices.
8. Quit.
>