インテル® Fortran コンパイラー 19.0 デベロッパー・ガイドおよびリファレンス
The PARAMETER statement discussed here is similar to the one discussed in PARAMETER; they both assign a name to a constant. However, this PARAMETER statement differs from the other one in the following ways:
Its list is not bounded with parentheses.
The form of the constant, rather than implicit or explicit typing of the name, determines the data type of the variable.
This PARAMETER statement takes the following form:
PARAMETER c = expr [, c = expr] ...
c |
Is the name of the constant. |
expr |
Is a constant expression. It can be of any data type. |
Each name c becomes a constant and is defined as the value of expression expr. Once a name is defined as a constant, it can appear in any position in which a constant is allowed. The effect is the same as if the constant were written there instead of the name.
The name of a constant cannot appear as part of another constant, except as the real or imaginary part of a complex constant. For example:
PARAMETER I=3 PARAMETER M=I.25 ! Not allowed PARAMETER N=(1.703, I) ! Allowed
The name used in the PARAMETER statement identifies only the name's corresponding constant in that program unit. Such a name can be defined only once in PARAMETER statements within the same program unit.
The name of a constant assumes the data type of its corresponding constant expression. The data type of a parameter constant cannot be specified in a type declaration statement. Nor does the initial letter of the constant's name implicitly affect its data type.
The following are valid examples of this form of the PARAMETER statement:
PARAMETER PI=3.1415927, DPI=3.141592653589793238D0
PARAMETER PIOV2=PI/2, DPIOV2=DPI/2
PARAMETER FLAG=.TRUE., LONGNAME='A STRING OF 25 CHARACTERS'