String expected $="|10100101-1000|$

$|"+$

$"100010554|$

$|1-140|$

$"$;

$/**$

$*$ override toString.

$*$ @return a String with all elements of this MathMatrix.

$*$ Each row is on a separate line.

$*$ Spacing based on longest element in this Matrix.

$*/$

public String toString$()\{$

return null;

$\}$