Sieve of Eratosthenes: Difference between revisions
Content deleted Content added
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=={{header|Fortran}}==
{{works with|Fortran|77}}
<lang fortran>
PROGRAM MAIN
INTEGER LI
WRITE (6,100)
READ (5,110) LI
call SOE(LI)
100 FORMAT( 'Limit:' )
110 FORMAT( I4 )
STOP
END
C --- SIEVE OF ERATOSTHENES ----------
SUBROUTINE SOE( LI )
INTEGER LI
LOGICAL A(LI)
INTEGER SL,P,I
DO 10 I=1,LI
A(I) = .TRUE.
10 CONTINUE
SL = INT(SQRT(REAL(LI)))
A(1) = .FALSE.
DO 30 P=2,SL
IF ( .NOT. A(P) ) GOTO 30
DO 20 I=P*P,LI,P
A(I)=.FALSE.
20 CONTINUE
30 CONTINUE
DO 40 I=2,LI
IF ( A(I) ) WRITE(6,100) I
40 CONTINUE
100 FORMAT(I3)
RETURN
END
</lang>
{{works with|Fortran|90 and later}}
<lang fortran>program sieve
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