Go to the previous, next section.
The CDL data types are:
char
byte
short
long
int
float
real
double
Except for the added data-type byte and the lack of the type
qualifier unsigned, CDL supports the same primitive data types as
C. In declarations, type names may be specified in either upper or
lower case.
Bytes differ from characters in that they are intended to hold
eight bits of data, and the zero byte has no special significance, as it
may for character data. Ncgen converts byte declarations
to char declarations in the output C code and to the nonstandard
BYTE declaration (or similar platform-specific declaration) in
output FORTRAN code.
Shorts can hold values between -32768 and 32767. Ncgen converts
short declarations to short declarations in the output
C code and to the nonstandard INTEGER*2 declaration in output
FORTRAN code.
Longs can hold values between -2147483648 and 2147483647.
Ncgen converts long declarations to long
declarations in the output C code and to INTEGER declarations in
output FORTRAN code. In CDL declarations int and integer
are accepted as synonyms for long.
Floats can hold values between about -3.4+38 and 3.4+38.
Their external representation is as 32-bit IEEE normalized
single-precision floating-point numbers. Ncgen converts
float declarations to float declarations in the output C
code and to REAL declarations in output FORTRAN code.
In CDL declarations real is accepted as a synonym for float.
Doubles can hold values between about -1.7+308 and 1.7+308.
Their external representation is as 64-bit IEEE standard
normalized double-precision, floating-point numbers. Ncgen
converts double declarations to double declarations in the
output C code and to DOUBLE PRECISION declarations in output
FORTRAN code.
Go to the previous, next section.