Sieve of Eratosthenes: Difference between revisions
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Not a robot (talk | contribs) Add CLU |
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The base primes culling page size is reduced from the page size for the main primes so that there is less overhead for smaller primes ranges; otherwise excess base primes are generated for fairly small sieve ranges. |
The base primes culling page size is reduced from the page size for the main primes so that there is less overhead for smaller primes ranges; otherwise excess base primes are generated for fairly small sieve ranges. |
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=={{header|CLU}}== |
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<lang clu>% Sieve of Eratosthenes |
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eratosthenes = proc (n: int) returns (array[bool]) |
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prime: array[bool] := array[bool]$fill(1, n, true) |
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prime[1] := false |
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for p: int in int$from_to(2, n/2) do |
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if prime[p] then |
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for c: int in int$from_to_by(p*p, n, p) do |
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prime[c] := false |
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end |
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end |
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end |
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return(prime) |
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end eratosthenes |
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% Print primes up to 1000 using the sieve |
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start_up = proc () |
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po: stream := stream$primary_output() |
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prime: array[bool] := eratosthenes(1000) |
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col: int := 0 |
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for i: int in array[bool]$indexes(prime) do |
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if prime[i] then |
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col := col + 1 |
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stream$putright(po, int$unparse(i), 5) |
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if col = 10 then |
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col := 0 |
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stream$putc(po, '\n') |
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end |
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end |
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end |
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end start_up</lang> |
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{{out}} |
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<pre> 2 3 5 7 11 13 17 19 23 29 |
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31 37 41 43 47 53 59 61 67 71 |
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73 79 83 89 97 101 103 107 109 113 |
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127 131 137 139 149 151 157 163 167 173 |
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179 181 191 193 197 199 211 223 227 229 |
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233 239 241 251 257 263 269 271 277 281 |
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283 293 307 311 313 317 331 337 347 349 |
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353 359 367 373 379 383 389 397 401 409 |
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419 421 431 433 439 443 449 457 461 463 |
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467 479 487 491 499 503 509 521 523 541 |
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547 557 563 569 571 577 587 593 599 601 |
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607 613 617 619 631 641 643 647 653 659 |
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661 673 677 683 691 701 709 719 727 733 |
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739 743 751 757 761 769 773 787 797 809 |
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811 821 823 827 829 839 853 857 859 863 |
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877 881 883 887 907 911 919 929 937 941 |
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947 953 967 971 977 983 991 997</pre> |
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=={{header|CMake}}== |
=={{header|CMake}}== |