Intel® Fortran Compiler 18.0 Developer Guide and Reference
The following table shows the data types that can appear in noncharacter type declarations.
Noncharacter Data Types |
|---|
BYTE1 |
LOGICAL2 |
LOGICAL([KIND=]1) (or LOGICAL*1) |
LOGICAL([KIND=]2) (or LOGICAL*2) |
LOGICAL([KIND=]4) (or LOGICAL*4) |
LOGICAL([KIND=]8) (or LOGICAL*8) |
INTEGER3 |
INTEGER([KIND=]1) (or INTEGER*1) |
INTEGER([KIND=]2) (or INTEGER*2) |
INTEGER([KIND=]4) (or INTEGER*4) |
INTEGER([KIND=]8) (or INTEGER*8) |
REAL4 |
REAL([KIND=]4) (or REAL*4) |
DOUBLE PRECISION (REAL([KIND=]8) or REAL*8) |
REAL([KIND=]16) (or REAL*16) |
COMPLEX5 |
COMPLEX([KIND=]4) (or COMPLEX*8) |
DOUBLE COMPLEX (COMPLEX([KIND=]8) or COMPLEX*16) |
COMPLEX([KIND=]16) (or COMPLEX*32) |
1 Same as INTEGER(1). 2 This is treated as default logical. 3 This is treated as default integer. 4 This is treated as default real. 5 This is treated as default complex. |
In noncharacter type declarations, you can optionally specify the name of the data object or function as v*n, where n is the length (in bytes) of v. The length specified overrides the length implied by the data type.
The value for n must be a valid length for the type of v. The type specifiers BYTE, DOUBLE PRECISION, and DOUBLE COMPLEX have one valid length, so the n specifier is invalid for them.
For an array specification, the n must be placed immediately following the array name; for example, in an INTEGER declaration, IVEC*2(10) is an INTEGER(2) array of 10 elements.
Note that certain compiler options can affect the defaults for numeric and logical data types.
In a noncharacter type declaration, a subsequent kind parameter overrides any initial kind parameter. For example, consider the following statements:
INTEGER(KIND=2) I, J, K, M12*4, Q, IVEC*4(10) REAL(KIND=8) WX1, WXZ, WX3*4, WX5, WX6*4 REAL(KIND=8) PI/3.14159E0/, E/2.72E0/, QARRAY(10)/5*0.0,5*1.0/
In the first statement, M12*4 and IVEC*4 override the KIND=2 specification. In the second statement, WX3*4 and WX6*4 override the KIND=8 specification. In the third statement, QARRAY is initialized with implicit conversion of the REAL(4) constants to a REAL(8) data type.