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Microsoft Programmer's Library 1.3
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demo.for
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1988-08-10
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47 lines
C Bubble Sort Demonstration Program
C Microsoft FORTRAN77
C 4 October 1982
C
C The main routine reads from the terminal an array
C of ten real numbers in F8.0 format and calls the
C subroutine BUBBLE to sort them.
C
REAL R(10)
INTEGER I
WRITE (*,001)
001 FORMAT(1X,'Bubble Sort Demonstration Program.')
100 DO 103 I=1,10
WRITE (*,101) I
101 FORMAT(1X,'Please input real number no. ',I2)
READ (*,102) R(I)
102 FORMAT(F8.0)
103 CONTINUE
CALL BUBBLE(R,10)
WRITE (*,002)
002 FORMAT(/1X,'The sorted ordering from lowest to highest is:')
WRITE (*,003) (R(I),I = 1,10)
003 FORMAT(2(1x,5F13.3/))
STOP
END
C
C Subroutine BUBBLE performs a bubble sort on a
C one-dimensional real array of arbitrary length. It sorts
C the array in ascending order.
SUBROUTINE BUBBLE(X,J)
INTEGER J,A1,A2
REAL X(J),TEMP
100 IF (J .LE. 1) GOTO 101
200 DO 201 A1 = 1,J-1
300 DO 301 A2 = A1 + 1,J
400 IF (X(A1) .LE. X(A2)) GOTO 401
TEMP = X(A1)
X(A1) = X(A2)
X(A2) = TEMP
401 CONTINUE
301 CONTINUE
201 CONTINUE
101 CONTINUE
RETURN
END