Answer

We are using a ``DO WHILE'' loop instead of a regular ``DO'' loop. Note that the end of the loop is marked with ``ENDDO'' just as with a regular ``DO'' loop. The loop runs until the condition specified after the ``DO WHILE'' becomes false. (The ABS in that condition is an intrinsic function that computes an absolute value.) In section 8.3 your text shows you how to construct such loops by using a GOTO statement. The method we have illustrated in the example program is easier to understand, and hence is superior. You should use it.

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