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A constant has a value which is fixed when the program is written.
The data type of every constant is evident from its form.
Arithmetic constants always use the decimal number base:
Standard Fortran does not support other number bases such as
octal or hexadecimal.
Although arithmetic constants may in general have a leading sign
(plus or minus) there are some circumstances in Fortran when an
unsigned constant is required. If the constant is zero then any sign