Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

  ◄QuickSCREEN►      ◄Details►     ◄Example►      ◄Contents►      ◄Index►
──────────────────────────────────────────────────────────────────────────────
TIMER Function Programming Example
 
The following program searches for the prime numbers from 3 to 10,000
using a variation of the Sieve of Eratosthenes. The TIMER function
is used to time the program.
 
'*** Programming example for the TIMER function
'
DEFINT A-Z
CONST UNMARK = 0, MARKIT = NOT UNMARK
DIM Mark(10000)
CLS                     'Clear the screen
Start! = TIMER
Num = 0
FOR N = 3 TO 10000 STEP 2
   IF NOT Mark(N) THEN
      'PRINT N,   'To print the primes, remove the
                  'remark delimiter in front of the
                  'PRINT statement.
      Delta = 2*N
      FOR I = 3*N TO 10000 STEP Delta
         Mark(I) = MARKIT
      NEXT
      Num = Num + 1
   END IF
NEXT
Finish! = TIMER
PRINT
PRINT "Program took";Finish! - Start!;
PRINT "seconds to find the";Num;"primes"
END
 
Sample Output
 
Program took .1601563 seconds to find the 1228 primes