Задача на массивы в Паскале

const n=10;
var mas:array[1..n] of real;
max_el:real;
i:integer;
begin
for i:=1 to n do
readln(mas[i]);
max_el:=mas[1];
for i:=2 to n do
if abs(mas[i])>abs(max_el) then max_el:=mas[i];
writeln('Max element =', max_el);
readln
end.

const n=10;
var mas:array[1..n] of real;
s:real;
b:boolean;
i:integer;
begin
for i:=1 to n do
readln(mas[i]);
max_el:=0;
b:=false;
for i:=1 to n do begin
if (mas[i])>0) and (not b) then b:=not b;
if b then s:=s+mas[i]; end;
writeln('Sum =', s);
readln
end.

const
 n=10;
var
 mas,m1,m2:array[1..n] of real;
 max_el,s,a,b:real;
 i,j1,j2:integer;
 bu:boolean;

begin
 for i:=1 to n do
  begin
   write('mas[',i:2,']= ');
   readln(mas[i]);
  end;
 for i:=1 to n do
  write(mas[i]:8:2);
 writeln;
 max_el:=mas[1];
 for i:=2 to n do
  if abs(mas[i])>abs(max_el) then max_el:=mas[i];
 writeln('Max element =', max_el:8:2);

 s:=0;
 bu:=false;
 for i:=1 to n do
  begin
   if (mas[i]>0) and (not bu) then bu:=not bu;
   if bu then s:=s+mas[i];
  end;
 writeln('Sum = ', s:10:2);

 writeln('Borders (a<b):');
 write('a= ');
 readln(a);
 write('b= ');
 readln(b);
 j1:=0;
 j2:=0;
 for i:=1 to n do
  begin
   if (frac(mas[i])>=a) and (frac(mas[i])<=b) then
    begin
     j1:=j1+1;
     m1[j1]:=mas[i];
    end
   else
    begin
     j2:=j2+1;
     m2[j2]:=mas[i];
    end;
  end;
 for i:=1 to j1 do
  mas[i]:=m1[i];
 for i:=j1+1 to n do
  mas[i]:=m2[i-j1];
 for i:=1 to n do
  write(mas[i]:8:2);
 readln
end.