3.- WHITE ITERATION
The WHILE is one of the three possible iterations in C. Its
syntax could be expressed in the following way:
4.- THE ITERATION DO - WHILE
Expressed in words, this means: execute
the propositions, then repeat the
execution while the expression gives a
TRUE result. The fundamental difference
between this iteration and the previous
one is that the DO-WHILE is always
executed AT LEAST once, whatever the
expression result.