PROGRAM d8r6(input,output,dfile);
(* driver for routine SORT3 *)
CONST
   nlen=64;
TYPE
   glsarray = ARRAY [1..nlen] OF real;
   gliarray = ARRAY [1..nlen] OF integer;
VAR
   i,j : integer;
   a,b,c,wksp : glsarray;
   indx : gliarray;
   amsg1 : PACKED ARRAY [1..40] OF char;
   amsg2 : PACKED ARRAY [1..24] OF char;
   n1,n2 : integer;
   amsg,bmsg,cmsg : PACKED ARRAY [1..nlen] OF char;
   dfile : text;

(*$I MODFILE.PAS *)
(*$I INDEXX.PAS *)

(*$I SORT3.PAS *)

BEGIN
   amsg1 := 'i''d rather have a bottle in front of me ';
   n1 := 40;
   amsg2 := 'than a frontal lobotomy.';
   n2 := 24;
   FOR i := 1 to n1 DO amsg[i] := amsg1[i];
   FOR i := 1 to n2 DO amsg[n1+i] := amsg2[i];
   writeln;
   writeln ('original message:');
   writeln (amsg);
(* read array of random numbers *)
   glopen(dfile,'tarray.dat');
   readln(dfile);
   FOR i := 1 to nlen DO read(dfile,a[i]);
   close(dfile);
(* create array b and array c *)
   FOR i := 1 to nlen DO BEGIN
      b[i] := i;
      c[i] := nlen+1-i
   END;
(* sort array a while mixing ib and ic *)
   sort3(nlen,a,b,c,wksp,indx);
(* scramble message according to array b *)
   FOR i := 1 to nlen DO BEGIN
      j := round(b[i]);
      bmsg[i] := amsg[j]
   END;
   writeln;
   writeln ('scrambled message:');
   writeln (bmsg);
(* unscramble according to array c *)
   FOR i := 1 to nlen DO BEGIN
      j := round(c[i]);
      cmsg[j] := bmsg[i]
   END;
   writeln;
   writeln ('mirrored message:');
   writeln (cmsg)
END.