pascal / 1 лаба / 3

uses crt;
const n=4;
var a:array[1..n,1..n]of integer;
i,j,z:integer;
begin
clrscr;
randomize;
for i:=1 to n do
for j:=1 to n do
a[i,j]:=random(100);
writeln;
for i:=1 to n do
begin
for j:=1 to n do
write(a[i,j]:5);
writeln;
end;
for i:=1 to n do
begin
z:=a[i,i];
a[i,i]:=a[i,n+1-i];
a[i,n+1-i]:=z;
end;
writeln('замена главной диагонали на побочную и наоборот');
for i:=1 to n do
begin
for j:=1 to n do
write(a[i,j]:5);
writeln;
end;
end.