uses crt;
const nmax=20;
fname='MATROLD.XXX';
type mas=array[1..nmax] of real;
var f,g:file of mas;
m,n,i,j,imx,k:byte;
mx:real;
a:mas;
s:string;
begin
clrscr;
randomize;
assign(f,fname);
rewrite(f);
repeat
write('Количество строк от 2 до ',nmax,' m=');
readln(m);
until m in [2..nmax];
repeat
write('Количество столбцов от 1 до ',m-1,' n=');
readln(n);
until n in [1..m-1];
for i:=1 to m do
begin
for j:=1 to n do
a[j]:=10*random;
write(f,a);
end;
close(f);
writeln('Содержание исходного файла:');
reset(f);
while not eof(f) do
begin
read(f,a);
for j:=1 to n do
write(a[j]:5:2);
writeln;
end;
close(f);
reset(f);
write('Новое имя файла :');
readln(s);
k:=m-n;
for i:=k to filesize(f)-1 do
begin
seek(f,i);
read(f,a);
seek(f,i-k);
write(f,a);
end;
rename(f,s);
close(f);
reset(f);
seek(f,n);
truncate(f);
close(f);
writeln('Содержание измененного файла ',s,':');
reset(f);
read(f,a);
mx:=a[1];
for i:=1 to n do
if a[i]>mx then mx:=a[i];
while not eof(f) do
begin
read(f,a);
for i:=1 to n do
if a[i]>mx then mx:=a[i];
end;
close(f);
reset(f);
while not eof(f) do
begin
read(f,a);
for j:=1 to n do
write(a[j]:5:2);
writeln;
end;
close(f);
write('Максимальный элемент=',mx:0:2);
readln
end.