1)
var
a, n, s: integer;
begin
write('n = ');
Readln(n);
a := 1;
while a <= n do
begin
s := s + a;
a := a + 1;
end;
writeln(s);
end.
2)
var
a, n: integer;
begin
write('n = ');
Readln(n);
a := 1;
while a <= n do
begin
writeln(2 * a);
a := a + 1;
end;
end.
3)
var
a, b: integer;
begin
write('Введите числа a и b: ');
Readln(a, b);
while a <= b do
begin
writeln(a, '^2 = ', sqr(a));
a := a + 1;
end;
end.
program prg;
var
number: integer;
begin
write('Input number: ');
read(number);
if number >= 0 then
number := number - 50
else
number := number + 100;
writeln('New value: ', number);
end.