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/************************************************/
/*                                              */
/* Prime Number Generator #1                    */
/*                                              */
/************************************************/

   /* Check for prime number by raw number */
   /* crunching. Try dividing all numbers  */
   /* up to half the size of a given i, if */
   /* remainder == 0 then not prime!       */

#include <stdio.h>

#define MAXINT  500
#define TRUE      1
#define FALSE     0

/*************************************************/
/* Level 0                                       */
/*************************************************/

main ()

{ int i;

for (i = 2; i <= MAXINT; i++)
   {
   if (prime(i))
      {
      printf ("%5d",i);
      }
   }
}

/*************************************************/
/* Level 1                                       */
/*************************************************/

prime (i)         /* check for a prime number */

int i;

{ int j;

for (j = 2; j <= i/2; j++)
   {
   if (i % j == 0)
      {
      return FALSE;
      }
   }

return TRUE;
}


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