the condition must evaluate to be true in a pretest loop before the instructions in the loop are processed.
Here, the conditions necessary to continue the loop are checked before executing the statements in the loop. FORTRAN 90 uses the DO WHILE construct to implement such loops.
The pretest loop tests its state before each iteration. A post-test loop tests its state at each iteration. A post-test loop is always executed at least once. What #include directives might my program need to use the random number generator function? Programs that use the pow and sqrt functions require the #include directive.
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