Control statements have the sole purpose of regulating the
flow of the program. Like a traffic signal, a control statement, or
loop, tells the computer whether to go or stop. It does this by
expressing the conditions under which an action should occur. If the
conditions are not met, the entire loop is ignored by the computer.
Operation statements are the lifeblood of a program. These
statements tell the computer what to do. Like the example about Jack
and Jane above, operation statements are commands to do an action on a
certain input and to produce a certain output. Some commands expect
to be told explicitly upon which input to act or where it should to
direct the output. If this information is expected and not given, the
command will be unclear to the computer, and the program will quit
unexpectedly.
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