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 (REAL*4) variables.

 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     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       The symbolic name of a constant, variable, array, 
            statement function 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   An initial value or values to be assigned to the 
            immediately preceding variable or array element.