! Program to test COMMON and EQUIVALENCE.
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! Program to test COMMON and EQUIVALENCE.
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program common
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program common
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real (kind=8) a(8)
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real (kind=8) a(8)
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real (kind=8) b(5), c(5)
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real (kind=8) b(5), c(5)
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common /com1/b,c
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common /com1/b,c
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equivalence (a(1), b(2))
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equivalence (a(1), b(2))
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b = 100
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b = 100
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c = 200
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c = 200
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call common_pass
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call common_pass
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call common_par (a, b,c)
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call common_par (a, b,c)
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call global_equiv
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call global_equiv
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call local_equiv
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call local_equiv
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end
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end
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! Use common block to pass values
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! Use common block to pass values
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subroutine common_pass
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subroutine common_pass
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real (kind=8) a(8)
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real (kind=8) a(8)
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real (kind=8) b(5), c(5)
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real (kind=8) b(5), c(5)
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common /com1/b,c
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common /com1/b,c
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equivalence (a(1), b(2))
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equivalence (a(1), b(2))
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if (any (a .ne. (/100,100,100,100,200,200,200,200/))) call abort
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if (any (a .ne. (/100,100,100,100,200,200,200,200/))) call abort
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end subroutine
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end subroutine
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! Common variables as argument
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! Common variables as argument
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subroutine common_par (a, b, c)
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subroutine common_par (a, b, c)
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real (kind=8) a(8), b(5), c(5)
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real (kind=8) a(8), b(5), c(5)
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if (any (a .ne. (/100,100,100,100,200,200,200,200/))) call abort
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if (any (a .ne. (/100,100,100,100,200,200,200,200/))) call abort
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if (any (b .ne. (/100,100,100,100,100/))) call abort
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if (any (b .ne. (/100,100,100,100,100/))) call abort
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if (any (c .ne. (/200,200,200,200,200/))) call abort
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if (any (c .ne. (/200,200,200,200,200/))) call abort
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end subroutine
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end subroutine
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! Global equivalence
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! Global equivalence
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subroutine global_equiv
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subroutine global_equiv
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real (kind=8) a(8), b(5), c(5), x(8), y(4), z(4)
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real (kind=8) a(8), b(5), c(5), x(8), y(4), z(4)
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common /com2/b, c, y, z
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common /com2/b, c, y, z
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equivalence (a(1), b(2))
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equivalence (a(1), b(2))
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equivalence (x(4), y(1))
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equivalence (x(4), y(1))
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b = 100
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b = 100
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c = 200
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c = 200
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y = 300
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y = 300
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z = 400
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z = 400
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if (any (a .ne. (/100,100,100,100,200,200,200,200/))) call abort
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if (any (a .ne. (/100,100,100,100,200,200,200,200/))) call abort
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if (any (x .ne. (/200,200,200,300,300,300,300,400/))) call abort
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if (any (x .ne. (/200,200,200,300,300,300,300,400/))) call abort
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end
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end
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! Local equivalence
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! Local equivalence
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subroutine local_equiv
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subroutine local_equiv
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real (kind=8) a(8), b(10)
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real (kind=8) a(8), b(10)
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equivalence (a(1), b(3))
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equivalence (a(1), b(3))
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b(1:5) = 100
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b(1:5) = 100
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b(6:10) = 200
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b(6:10) = 200
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if (any (a .ne. (/100,100,100,200,200,200,200,200/))) call abort
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if (any (a .ne. (/100,100,100,200,200,200,200,200/))) call abort
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end subroutine
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end subroutine
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