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Chapter 6. Making Decisions > Boolean Variables

Boolean Variables

Just about anyone learning to program soon faces the task of having to write a program to generate a table of prime numbers. To refresh your memory, a positive integer, p, is a prime number if it is not evenly divisible by any other integers other than 1 and itself. The first prime integer is defined to be 2. The next prime is 3 because it is not evenly divisible by any integers other than 1 and 3; and 4 is not prime because it is evenly divisible by 2.

You can take several approaches to generate a table of prime numbers. If you had the task of generating all prime numbers up to 50, for example, the most straightforward (and simplest) algorithm to generate such a table would simply test each integer, p, for divisibility by all integers from 2 through p-1. If any such integer evenly divided p, then p would not be prime; otherwise, it would be a prime number.


  

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