Sieve of Eratosthenes: Difference between revisions
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Output: |
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<lang>2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97</lang> |
<lang>2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97</lang> |
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=={{header|FreeBASIC}}== |
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<lang freebasic>' FB 1.05.0 |
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Sub sieve(n As Integer) |
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If n < 2 Then Return |
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Dim a(2 To n) As Integer |
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For i As Integer = 2 To n : a(i) = i : Next |
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Dim As Integer p = 2, q |
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' mark non-prime numbers by setting the corresponding array element to 0 |
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Do |
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For j As Integer = p * p To n Step p |
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a(j) = 0 |
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Next j |
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' look for next non-zero element in array after 'p' |
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q = 0 |
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For j As Integer = p + 1 To Sqr(n) |
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If a(j) <> 0 Then |
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q = j |
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Exit For |
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End If |
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Next j |
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If q = 0 Then Exit Do |
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p = q |
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Loop |
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' print the non-zero numbers remaining i.e. the primes |
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For i As Integer = 2 To n |
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If a(i) <> 0 Then |
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Print Using "####"; a(i); |
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End If |
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Next |
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Print |
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End Sub |
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Print "The primes up to 1000 are :" |
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Print |
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sieve(1000) |
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Print |
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Print "Press any key to quit" |
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Sleep</lang> |
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{{out}} |
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<pre> |
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The primes up to 1000 are : |
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2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 |
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73 79 83 89 97 101 103 107 109 113 127 131 137 139 149 151 157 163 167 173 |
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179 181 191 193 197 199 211 223 227 229 233 239 241 251 257 263 269 271 277 281 |
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283 293 307 311 313 317 331 337 347 349 353 359 367 373 379 383 389 397 401 409 |
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419 421 431 433 439 443 449 457 461 463 467 479 487 491 499 503 509 521 523 541 |
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547 557 563 569 571 577 587 593 599 601 607 613 617 619 631 641 643 647 653 659 |
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661 673 677 683 691 701 709 719 727 733 739 743 751 757 761 769 773 787 797 809 |
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811 821 823 827 829 839 853 857 859 863 877 881 883 887 907 911 919 929 937 941 |
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947 953 967 971 977 983 991 997 |
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</pre> |
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=={{header|GAP}}== |
=={{header|GAP}}== |
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<lang gap>Eratosthenes := function(n) |
<lang gap>Eratosthenes := function(n) |