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The defect of many while loops is that the details that
govern the looping appear in three places: the place where the
counting variable is initialized, the place where it is tested,
and the place where it is reassigned. Such distribution makes
the looping difficult to understand. Accordingly, you also need
to know about the
for statement:
for (entry expression;
Boolean expression;
continuation expression)
embedded statement
The entry expression is evaluated only once, when the for
statement is entered. Once the entry expression is evaluated,
the Boolean expression is evaluated, and if the result is not
0, the embedded statement is evaluated, followed by the
continuation expression. Then, the
Boolean-expression–embedded-statement–continuation-expression
evaluation cycle continues until the Boolean expression
eventually evaluates to 0.