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### `loop`, `break`, `return`, `continue`

There are three kinds of statements for loops (repetitions): the `while` statement, the `for` statement, and the `do` statement.

- `while` statement
  It has the following form.

      while ( expression ) statement

  This statement specifies that `statement` is repeatedly evaluated as far as the `expression` evaluates to a non-zero value. If the expression 1 is given to the `expression`, it forms an infinite loop.
- `for` statement
  It has the following form.

      for ( expression list-1; expression; expression list-2 ) statement

  This is equivalent to the program

      expression list-1 (transformed into a sequence of simple statement)
      while ( expression ) {
          statement
          expression list-2 (transformed into a sequence of simple statement)
      }

- `do` statement

      do {
          statement
      } while ( expression )

  This statement differs from `while` statement by the location of the termination condition: This statement first execute the `statement` and then check the condition, whereas `while` statement does it in the reverse order.

As means for exiting from loops, there are `break` statement and `return` statement. The `continue` statement allows to move the control to a certain point of the loop.

- `break`
  The `break` statement is used to exit the inner most loop.
- `return`
  The `return` statement is usually used to exit from a function call and it is also effective in a loop.
- `continue`
  The `continue` statement is used to move the control to the end point of the loop body. For example, the last expression list will be evaluated in a `for` statement, and the termination condition will be evaluated in a `while` statement.

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