text: ieve of Eratosthenes benchmark from BYTE, Sep. '81, pg. 186.
  	Compile by:
  			A>cc1 sieve.c -e1000
  	All variables have been made external to speed them up; other than
  	that one change, the program is identical to the one used in the BYTE
  	benchmark....while they got an execution time of 49.5 seconds and a
  	size of 3932 bytes using v1.32 of the compiler,
  			    ********
  	v1.45 clocks in at  * 15.2 *  seconds with a size of 3718 bytes!
  			    ********
  */
  
  #define TRUE 1
  #define FALSE 0
  #define SIZE 8190
  #define SIZEPL 8191
  
  char flags[SIZEPL];
  int i,prime,k,count,iter;
  
  main()
  {
  	printf("Hit return to do 10 iterations: ");
  	getchar();
  
  	for (iter = 1; iter <= 10; iter++) {
  		count = 0;
  		for (i = 0; i <= SIZE; i++)
  			flags[i] = TRUE;
  		for (i = 0; i <= SIZE; i++) {
  			if (flags[i]) {
  				prime = i + i + 3;
  				k = i + prime;
  				while (k <= SIZE) {
  					flags[k] = FALSE;
  					k += prime;
  				}
  				count++;
  			}
  		}
  	}
  	printf("\7\n%d primes.\n",count);
  }
  
  