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8.228 REAL — Convert to real type ¶

Description:

REAL(A [, KIND]) converts its argument A to a real type. The REALPART function is provided for compatibility with g77, and its use is strongly discouraged.

Standard:

Fortran 77 and later, with KIND argument Fortran 90 and later, has GNU extensions

Class:

Elemental function

Syntax:

RESULT = REAL(A [, KIND])

RESULT = REALPART(Z)

Arguments:

A	Shall be INTEGER, REAL, or COMPLEX.
KIND	(Optional) An INTEGER initialization expression indicating the kind parameter of the result.

Return value:

These functions return a REAL variable or array under the following rules:

(A)

REAL(A) is converted to a default real type if A is an integer or real variable.

(B)

REAL(A) is converted to a real type with the kind type parameter of A if A is a complex variable.

(C)

REAL(A, KIND) is converted to a real type with kind type parameter KIND if A is a complex, integer, or real variable.

Example:

program test_real
  complex :: x = (1.0, 2.0)
  print *, real(x), real(x,8), realpart(x)
end program test_real

Specific names:

Name	Argument	Return type	Standard
FLOAT(A)	INTEGER(4)	REAL(4)	Fortran 77 and later
DFLOAT(A)	INTEGER(4)	REAL(8)	GNU extension
FLOATI(A)	INTEGER(2)	REAL(4)	GNU extension (-fdec)
FLOATJ(A)	INTEGER(4)	REAL(4)	GNU extension (-fdec)
FLOATK(A)	INTEGER(8)	REAL(4)	GNU extension (-fdec)
SNGL(A)	REAL(8)	REAL(4)	Fortran 77 and later

See also:

DBLE — Double conversion function