TOPS-20 PASCAL Language Manual - Bitsavers

PROCEDURES AND FUNCTIONS
Table ~-l:
Predeclared Procedures (Cont.)
Procedure
Parameter Type
Action
READ(f, vl, ... ,vn)
READLN(f, vl, ... ,vn)
RELEASE(a)
RESET(f)
REWRITE ( f)
UNPACK(z,a,i)
f file variable
vl, .•. ,vn
variables
f text file
variable vl, ... ,vn
variables
a a variable
type "INTEGER
f
f
f i 1 e variable
file variable
of
z = variable of type
PACKED ARRAyru •• vl
OF t
a = variable of type
ARRAY fm .. nl OF T
i = starting index
in array a
For vI through vn,
RE~D assigns the
next value in the
input file f to the
variable. You must
specify at least one
variable (vI). The
default for f is
INPUT.
Performs the READ
procedure for vI
through vn, then
sets the current
file position to the
beginning of the
next line. The
variable list is
optional. The
default or f is
INPUT.
Deallocates memory
allocated by the NEW
procedure up to the
point set by
MARK procedure.
the
Enables read i ng from
file f • RESET (f)
moves the current
file position to the
beginning of file f
and assigns the
first component of f
to the file buffer
variable, f ".
EOF(f) is set to
FALSE unless the
file is empty.
Enables writing ~o
file f. REWRITE(f)
sets the file f to
zero length and sets
EOF (f) to TRUE.
Moves (v-u+l)
elements from array
z to array a by
assigning elements
z (u] through z (vl to
a[i]
ari+v-u].
through
The upper
bound of a must be
greater than or
equal to (i+v-u).
6-4