SIMSCRIPT II.5 Programming Language

SIMSCRIPT II.5 Programming Language
This specifies that columns to the right of the indicated column do not contain program statements.
These columns appear on all program listings produced during compilation, but are not treated as
part of the program text. Each time a last column card is used in a preamble, the number of
program statement columns may change. The last last column statement used in a preamble applies
to all subprograms that follow. This statement may not appear in individual routines within a
program. The simplest preamble, used to specify sequence number columns, is:
preamble
last column is 72
end
This specifies that in all succeeding cards only columns 1 through 72 contain program statements.
Columns 73 through 80 are listed but ignored during compilation.
2.29 A Useful Output Statement
There are occasions when it is useful to generate clearly labeled values of selected variables with
no attempt at explicit formatting. This is particularly helpful when checking for programming errors,
for example.
The list statement prints labeled values of expressions and variables. The form of the statement is:
list variable name or expression list
Explicitly subscripted variables and entire array names may be included in the list. Expression and
array values are printed in standard formats. These formats vary somewhat on different implementations.
In general, expression values are printed in rows across a page with the "name" of each expression
beside its value. Thus a request to:
list A, B(1), A*B(1)
might produce the output:
A = 2.000000 B(1) = 3.500000 A*B(1) = 7.000000
If unsubscripted array names appear in the list, all elements of the array are listed in the output with
each element value labeled with its corresponding subscripted array name. As many values are
placed on each line as will fit, according to spacing conventions. Such conventions usually allow
the name of the variable justified on the left in a field aligned to a column multiple of 16, followed
by the value of the variable. A minimum of two character positions is allowed between successive
variable fields across a line. Text and alpha variables values are enclosed in double quotation
marks.
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