toString method
A string representation of this object.
Some classes have a default textual representation,
often paired with a static parse function (like int.parse).
These classes will provide the textual representation as
their string representation.
Other classes have no meaningful textual representation
that a program will care about.
Such classes will typically override toString to provide
useful information when inspecting the object,
mainly for debugging or logging.
Implementation
@override
String toString() {
return '${c == 1 ? 'y' : c == 0 ? '0' : '${c}y'} = ${a == 1 ? 'x' : a == 0 ? '' : '${a}x'}${b == 0 ? '' : ' + $b'}';
}