Fortran Data Types Intrinsic types
Example
The following are data types intrinsic to Fortran:
integer
real
character
complex
logical
integer, real and complex are numeric types.
character is a type used to store character strings.
logical is used to store binary values .true. or .false..
All numeric and logical intrinsic types are parametrized using kinds.
integer(kind=specific_kind)
or just
integer(specific_kind)
where specific_kind is an integer named constant.
Character variables, as well as having a kind parameter, also have a length parameter:
character char
declares char to be a length-1 character variable of default kind, whereas
character(len=len) name
declares name to be a character variable of default kind and length len. The kind can also be specified
character(len=len, kind=specific_kind) name
character(kind=specific_kind) char
declares name to be a character of kind kind and length len. char is a length-1 character of kind kind.
Alternatively, the obsolete form for character declaration
character*len name
may be seen in older code, declaring name to be of length len and default character kind.
Declaration of a variable of intrinsic type may be of the form above, but also may use the type(...) form:
integer i
real x
double precision y
is equivalent to (but greatly preferred over)
type(integer) i
type(real) x
type(double precision) y
