Задание про строки по Выведите количество предложений и количество строк в тексте Task.txt.
2) Выведите на экран каждую четную строку текста Task.txt.
3) Замените первое вхождение слова «PHP» в тексте Task.txt на: «PHP (серверный язык программирования)». Сохраните изменения и выведите на экран.

//Pascal
//1
begin
writeln((15 div 4)*18);
end.

//2
var a, b, c: real;
begin
write('Введите стороны треугольника A B C: '); readln(a, b, c);
writeln('Периметр = ', a + b + c);
end.

//3
var a, b: real;
begin
write('Введите стороны прямоугольника A B: '); readln(a, b);
writeln('Площадь = ', a * b);
writeln('Периметр = ', 2 * (a + b));
end.

//4
var a, b, c: real;
begin
write('Введите ребра A, B, C: '); readln(a, b, c);
writeln('Площадь = ', (2*(a*b+b*c+a*c)):0:1);
writeln('Объем = ', (a*b*c):0:1);
end.

//5
var r: real;
begin
write('Введите радиус: '); readln(r);
writeln('Длина окружности = ', (2 * pi * r):0:1);
end.

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