Simple Pascal question

How does one assign a non-integer to an explicit floating
point type variable?
$ type z.pas
program z(input,output);
var
    x : f_float;
begin
    x := 1;
    writeln(x);
end.
$ pas z
$ lin z
$ r z
  1.00000E+00
$ type zz.pas
program z(input,output);
var
    x : f_float;
begin
    x := 1.5;
    writeln(x);
end.
$ pas zz
    x := 1.5;
.....^
%PASCAL-E-OPNDASSCOM, Operands are not assignment compatible
at line number 7 in file DKA0:[arne.vmsjava.tig]zz.pas;3
%PASCAL-E-ENDDIAGS, PASCAL completed with 1 diagnostic
Arne