While each logical element or condition must always have a logic value of either "0"
or "1", we also need to have ways to combine different logical signals or conditions to
provide a logical result.
For example, consider the logical statement: "If I move the switch on the wall up, the
light will turn on." At first glance, this seems to be a correct statement. However, if
we look at a few other factors, we realize that there's more to it than this. In this
example, a more complete statement would be: "If I move the switch on the wall
upand the light bulb is good and the power is on, the light will turn on."