ISO Pascal reference manual

*ERROR 104 -- this statement requires that the name INPUT appear in
the list of parameters following PROGRAM
If the file parameter is omitted from a call on the procedures READ or
READLN, or the functions EOLN or EOF, the required file INPUT is
assumed. In such cases INPUT must appear as one of the program
parameters at the head of the program. However it must not appear in an
outermost VAR statement.
PROGRAM fail;
BEGIN
END.
readln; (implies use of INPUT}
*ERROR 105 -- this statement requires that the name OUTPUT appear
in the list of parameters following PROGRAM
If the file parameter is omitted from calls on the procedures WRITE,
WRITELN or PAGE the required file OUTPUT is assumed. In such cases
OUTPUT must appear as one of the program parameters at the head of the
program. However it must not appear in an outermost VAR statement.
PROGRAM fail;
BEGIN
END.
writeln('hello'); (implies use of OUTPUT}
*ERROR 106 -- the field width parameters must be of integer type
The parameters used in WRITE and WRITELN to specify field widths
must yield integer values.
PROGRAM fail(output);
BEGIN
END.
writeln('hello ' :9.5);
*ERROR 107 -- ABS needs a real or integer type parameter
The function ABS returns the absolute value of either integer or real values;
it cannot be used with any other types.
82 Pascal Issue I