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fortran .HLP

Implication

In the absence of either IMPLICIT statements or explicit type statements, all variables with names beginning with I, J, K, L, M, or N are assumed to be integer variables. Variables beginning with any other letter are assumed to be REAL*4 variables.

Specification

Type declaration statements explicitly define the data type of variables.

Numeric type declaration statements have the form:

type v[/clist][,v[/clist]]...

type Is any data type except CHARACTER.

v Is the name of a constant, variable, array, statement function or function subprogram, or array declarator.

clist Is a list of constants.

Character type declaration statements have the form:

CHARACTER[*len[,]] v[*len] [/clist/] [,v[*len] [/clist/]]...

len Is an unsigned integer constant, an integer constant expression enclosed in parentheses, or an asterisk enclosed in parentheses.

The value of len specifies the length of the character data elements.

v Is the symbolic name of a constant, variable, array, statement or function subprogram, or array declarator.

The name can optionally be followed by a data type length specifier (*n). For character entities, the length specifier can be *len or *(*).

clist Is an initial value or values to be assigned to the immediately preceding variable or array element.