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35 lines
662 B
35 lines
662 B
program main |
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use, intrinsic :: iso_fortran_env, only : error_unit, sp=>real32, dp=>real64 |
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implicit none |
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real(sp) :: a32 |
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real(dp) :: a64 |
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real(sp), parameter :: pi32 = 4*atan(1._sp) |
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real(dp), parameter :: pi64 = 4*atan(1._dp) |
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if (pi32 == pi64) error stop 'real32 values generally do not exactly equal real64 values' |
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call timestwo(a32) |
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call timestwo(a64) |
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contains |
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elemental subroutine timestwo(a) |
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class(*), intent(inout) :: a |
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select type (a) |
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type is (real(sp)) |
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a = 2*a |
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type is (real(dp)) |
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a = 2*a |
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type is (integer) |
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a = 2*a |
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class default |
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error stop 'requires real32, real64 or integer' |
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end select |
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end subroutine timestwo |
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end program
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