uses crt;
var c:integer;
begin
clrscr;
c:=1000;
while c<20000 do
begin
c:=c+1000;
writeln('Частота=',c:5);
sound(c);
delay(2000);
nosound;
end;
readln
end.
uses crt;
var c:integer;
begin
clrscr;
c:=1000;
while c<20000 do
begin
c:=c+1000;
writeln('Частота=',c:5);
sound(c);
delay(2000);
nosound;
end;
readln
end.