cast_kind

Cast Kind nodes or cast kind types.

Declaration

Syntax

cast_kind
    = RealToInteger
    | IntegerToReal
    | LogicalToReal
    | RealToReal
    | IntegerToInteger
    | RealToComplex
    | IntegerToComplex
    | IntegerToLogical
    | RealToLogical
    | CharacterToLogical
    | CharacterToInteger
    | CharacterToList
    | ComplexToLogical
    | ComplexToComplex
    | ComplexToReal
    | ComplexToInteger
    | LogicalToInteger
    | RealToCharacter
    | IntegerToCharacter
    | LogicalToCharacter

Arguments

None.

Return values

None.

Описание

cast_kind nodes or cast kind types denotes kinds to typecast one idenfier to another.

cast_kind denotes the types supported for cast in LFortran.

Types

It denotes all types supported in LFortran, which are:

  1. RealToInteger denotes cast_kind of real to integer type.

  2. IntegerToReal denotes cast_kind of integer to real type.

  3. LogicalToReal denotes cast_kind of logical to real type.

  4. RealToReal denotes cast_kind of Real to Real.

  5. IntegerToInteger denotes cast_kind of integer to integer.

  6. RealToComplex denotes cast_kind of Real to complex.

  7. IntegerToComplex denotes cast_kind of integer to complex.

  8. IntegerToLogical denotes cast_kind of integer to logical.

  9. RealToLogical denotes cast_kind of real to logical.

  10. CharacterToLogical denotes cast_kind of character to logical.

  11. CharacterToInteger denotes cast_kind of character to integer.

  12. CharacterToList denotes cast_kind of character to list.

  13. ComplexToLogical denotes cast_kind of complex to logical.

  14. ComplexToComplex denotes cast_kind of complex to complex.

  15. ComplexToReal denotes cast_kind of complex to real.

  16. ComplexToInteger denotes cast_kind of complex to integer.

  17. LogicalToInteger denotes cast_kind of logical to integer.

  18. RealToCharacter denotes cast_kind of real to character.

  19. IntegerToCharacter denotes cast_kind of integer to character.

  20. LogicalToCharacter denotes cast_kind of logical to character.

Examples

Example for RealToInteger:

program types_03
implicit none
real :: r
integer :: i
r = 1.5
print *, r
i = r
print *, i
end program

ASR:

(TranslationUnit
    (SymbolTable
        1
        {
            types_03:
                (Program
                    (SymbolTable
                        2
                        {
                            i:
                                (Variable
                                    2
                                    i
                                    Local
                                    ()
                                    ()
                                    Default
                                    (Integer 4 [])
                                    Source
                                    Public
                                    Required
                                    .false.
                                ),
                            r:
                                (Variable
                                    2
                                    r
                                    Local
                                    ()
                                    ()
                                    Default
                                    (Real 4 [])
                                    Source
                                    Public
                                    Required
                                    .false.
                                )

                        })
                    types_03
                    []
                    [(=
                        (Var 2 r)
                        (RealConstant
                            1.500000
                            (Real 4 [])
                        )
                        ()
                    )
                    (Print
                        ()
                        [(Var 2 r)]
                        ()
                        ()
                    )
                    (=
                        (Var 2 i)
                        (Cast
                            (Var 2 r)
                            RealToInteger
                            (Integer 4 [])
                            ()
                        )
                        ()
                    )
                    (Print
                        ()
                        [(Var 2 i)]
                        ()
                        ()
                    )]
                )

        })
    []
)

Example for IntegerToReal:

program types_02
implicit none
real :: r
integer :: i
i = 1
r = 1
r = i
end program

ASR:

(TranslationUnit
    (SymbolTable
        1
        {
            types_02:
                (Program
                    (SymbolTable
                        2
                        {
                            i:
                                (Variable
                                    2
                                    i
                                    Local
                                    ()
                                    ()
                                    Default
                                    (Integer 4 [])
                                    Source
                                    Public
                                    Required
                                    .false.
                                ),
                            r:
                                (Variable
                                    2
                                    r
                                    Local
                                    ()
                                    ()
                                    Default
                                    (Real 4 [])
                                    Source
                                    Public
                                    Required
                                    .false.
                                )

                        })
                    types_02
                    []
                    [(=
                        (Var 2 i)
                        (IntegerConstant 1 (Integer 4 []))
                        ()
                    )
                    (=
                        (Var 2 r)
                        (Cast
                            (IntegerConstant 1 (Integer 4 []))
                            IntegerToReal
                            (Real 4 [])
                            (RealConstant
                                1.000000
                                (Real 4 [])
                            )
                        )
                        ()
                    )
                    (=
                        (Var 2 r)
                        (Cast
                            (Var 2 i)
                            IntegerToReal
                            (Real 4 [])
                            ()
                        )
                        ()
                    )]
                )

        })
    []
)

Example of RealToReal:

program types_01
implicit none
real :: r
r = 1.0
r = 1.5
r = 1.
r = float(2)
r = dble(3)
end program

ASR:

(TranslationUnit
    (SymbolTable
        1
        {
            types_01:
                (Program
                    (SymbolTable
                        2
                        {
                            r:
                                (Variable
                                    2
                                    r
                                    Local
                                    ()
                                    ()
                                    Default
                                    (Real 4 [])
                                    Source
                                    Public
                                    Required
                                    .false.
                                )

                        })
                    types_01
                    []
                    [(=
                        (Var 2 r)
                        (RealConstant
                            1.000000
                            (Real 4 [])
                        )
                        ()
                    )
                    (=
                        (Var 2 r)
                        (RealConstant
                            1.500000
                            (Real 4 [])
                        )
                        ()
                    )
                    (=
                        (Var 2 r)
                        (RealConstant
                            1.000000
                            (Real 4 [])
                        )
                        ()
                    )
                    (=
                        (Var 2 r)
                        (Cast
                            (Cast
                                (IntegerConstant 2 (Integer 4 []))
                                IntegerToReal
                                (Real 8 [])
                                (RealConstant
                                    2.000000
                                    (Real 8 [])
                                )
                            )
                            RealToReal
                            (Real 4 [])
                            (RealConstant
                                2.000000
                                (Real 4 [])
                            )
                        )
                        ()
                    )
                    (=
                        (Var 2 r)
                        (Cast
                            (Cast
                                (IntegerConstant 3 (Integer 4 []))
                                IntegerToReal
                                (Real 8 [])
                                (RealConstant
                                    3.000000
                                    (Real 8 [])
                                )
                            )
                            RealToReal
                            (Real 4 [])
                            (RealConstant
                                3.000000
                                (Real 4 [])
                            )
                        )
                        ()
                    )]
                )

        })
    []
)

Example of IntegerToLogical:

program logical4
    ! this program checks logical operators
    implicit none

       ! variable declaration
       logical :: a, b, c

       ! assigning values
       a = 2
       b = -1
       c = 0

       print *, a, b, c

end program logical4

ASR:

(TranslationUnit
    (SymbolTable
        1
        {
            logical4:
                (Program
                    (SymbolTable
                        2
                        {
                            a:
                                (Variable
                                    2
                                    a
                                    Local
                                    ()
                                    ()
                                    Default
                                    (Logical 4 [])
                                    Source
                                    Public
                                    Required
                                    .false.
                                ),
                            b:
                                (Variable
                                    2
                                    b
                                    Local
                                    ()
                                    ()
                                    Default
                                    (Logical 4 [])
                                    Source
                                    Public
                                    Required
                                    .false.
                                ),
                            c:
                                (Variable
                                    2
                                    c
                                    Local
                                    ()
                                    ()
                                    Default
                                    (Logical 4 [])
                                    Source
                                    Public
                                    Required
                                    .false.
                                )

                        })
                    logical4
                    []
                    [(=
                        (Var 2 a)
                        (Cast
                            (IntegerConstant 2 (Integer 4 []))
                            IntegerToLogical
                            (Logical 4 [])
                            ()
                        )
                        ()
                    )
                    (=
                        (Var 2 b)
                        (Cast
                            (IntegerUnaryMinus
                                (IntegerConstant 1 (Integer 4 []))
                                (Integer 4 [])
                                (IntegerConstant -1 (Integer 4 []))
                            )
                            IntegerToLogical
                            (Logical 4 [])
                            ()
                        )
                        ()
                    )
                    (=
                        (Var 2 c)
                        (Cast
                            (IntegerConstant 0 (Integer 4 []))
                            IntegerToLogical
                            (Logical 4 [])
                            ()
                        )
                        ()
                    )
                    (Print
                        ()
                        [(Var 2 a)
                        (Var 2 b)
                        (Var 2 c)]
                        ()
                        ()
                    )]
                )

        })
    []
)

Example of ComplexToComplex:

program complex_dp

    complex(4) :: zero
    complex(8) :: v
    complex :: x
    zero = 0.0_4
    v = (1.05_4, 1.05_4)
    x = (1.05_4, 1.05_8)
    print *, v, x, zero

end program

ASR:

(TranslationUnit
    (SymbolTable
        1
        {
            complex_dp:
                (Program
                    (SymbolTable
                        2
                        {
                            v:
                                (Variable
                                    2
                                    v
                                    Local
                                    ()
                                    ()
                                    Default
                                    (Complex 8 [])
                                    Source
                                    Public
                                    Required
                                    .false.
                                ),
                            x:
                                (Variable
                                    2
                                    x
                                    Local
                                    ()
                                    ()
                                    Default
                                    (Complex 4 [])
                                    Source
                                    Public
                                    Required
                                    .false.
                                ),
                            zero:
                                (Variable
                                    2
                                    zero
                                    Local
                                    ()
                                    ()
                                    Default
                                    (Complex 4 [])
                                    Source
                                    Public
                                    Required
                                    .false.
                                )

                        })
                    complex_dp
                    []
                    [(=
                        (Var 2 zero)
                        (Cast
                            (RealConstant
                                0.000000
                                (Real 4 [])
                            )
                            RealToComplex
                            (Complex 4 [])
                            (ComplexConstant
                                0.000000
                                0.000000
                                (Complex 4 [])
                            )
                        )
                        ()
                    )
                    (=
                        (Var 2 v)
                        (Cast
                            (ComplexConstructor
                                (RealConstant
                                    1.050000
                                    (Real 4 [])
                                )
                                (RealConstant
                                    1.050000
                                    (Real 4 [])
                                )
                                (Complex 4 [])
                                (ComplexConstant
                                    1.050000
                                    1.050000
                                    (Complex 4 [])
                                )
                            )
                            ComplexToComplex
                            (Complex 8 [])
                            ()
                        )
                        ()
                    )
                    (=
                        (Var 2 x)
                        (Cast
                            (ComplexConstructor
                                (RealConstant
                                    1.050000
                                    (Real 4 [])
                                )
                                (RealConstant
                                    1.050000
                                    (Real 8 [])
                                )
                                (Complex 8 [])
                                (ComplexConstant
                                    1.050000
                                    1.050000
                                    (Complex 8 [])
                                )
                            )
                            ComplexToComplex
                            (Complex 4 [])
                            ()
                        )
                        ()
                    )
                    (Print
                        ()
                        [(Var 2 v)
                        (Var 2 x)
                        (Var 2 zero)]
                        ()
                        ()
                    )]
                )

        })
    []
)

See Also