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PRIME.RAT
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1984-07-05
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768b
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27 lines
#-h- prime.r 915 local 01/05/81 21:33:07
# prime --- get the ith prime number (from a file of primes)
long_int function prime (i)
long_int i
integer fd, junk
integer open, mapfd
if (i < 1 || i > LASTPRIME)
return (0)
fd = open ("=aux=/primes"s, READ)
if (fd == ERR)
return (0)
call prwf$$ (KREAD + KPREA, mapfd (fd), loc (prime), 2, (i-1)*2,
junk, junk) # straight binary seek-and-read
call close (fd)
return
end
#-t- prime.r 915 local 01/05/81 21:33:07
#-t- prime 2253 local 01/05/81 21:38:50
ins the prime numbers up to one million in
long-integer binary format.
If =aux=/primes is unreadable or if '