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Data types

Arm® Fortran Compiler provides the following intrinsic data types:

Intrinsic data types

Data Type

Specified as

Size (bytes)

INTEGER

INTEGER

INTEGER*1

INTEGER([KIND=]1)

INTEGER*2

INTEGER([KIND=]2)

INTEGER*4

INTEGER([KIND=]4)

INTEGER*8

INTEGER([KIND=]8)

4

1

1

2

2

4

4

8

8

REAL

REAL

REAL*4

REAL([KIND=]4)

REAL*8

REAL([KIND=]8)

4

4

4

8

8

DOUBLE PRECISION

DOUBLE PRECISION (same as REAL*8, no KIND parameter is permitted )

16

COMPLEX

COMPLEX

COMPLEX*8

COMPLEX([KIND=]4)

COMPLEX*16

COMPLEX([KIND=]8)

4

8

8

16

16

DOUBLE COMPLEX

DOUBLE COMPLEX (same as COMPLEX*8, no KIND parameter is permitted)

8

LOGICAL

LOGICAL

LOGICAL*1

LOGICAL([KIND=]1)

LOGICAL*2

LOGICAL([KIND=]2)

LOGICAL*4

LOGICAL([KIND=]4)

LOGICAL*8

LOGICAL([KIND=]8)

4

1

1

2

2

4

4

8

8

CHARACTER

CHARACTER

CHARACTER([KIND=]1)

1

1

BYTE

BYTE (same as INTEGER([KIND=]1))

1

Note

  • The default entries are the first entries for each intrinsic data type.

  • To determine the kind type parameter of a representation method, use the intrinsic function KIND.

For more portable programs, define a PARAMETER constant using the appropriate SELECTED_INT_KIND or SELECTED_REAL_KIND functions, as appropriate.

For example, this code defines a PARAMETER constant for an INTEGER kind that has 9 digits:

INTEGER, PARAMETER :: MY_INT_KIND = SELECTED_INT_KIND(9)
...
INTEGER(MY_INT_KIND) :: J
...
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