#include<iostream>
using namespace std;
int main()
{
setlocale( LC_ALL, "Russian" );
float a,b,s;
int dp;
cout << "Привет! Я калькулятор!Какие действие вы будете выполнять:" << endl;
cout << "1. Сложение. " << endl;
cout << "2. Отнимание." << endl;
cout << "3. Умножение." << endl;
cout << "4. Деление." << endl;
cout << "Введите число для выбора действия" << endl;
cin >> dp;
switch(dp)
{
case 1:
cout << "Число a = " << endl;
cin >> a;
cout << "Число b = " << endl;
cin >> b;
s = a + b;
cout << "\n" << a << " * " << b << " = "<< s << endl;
break;
case 2:
cout << "Число a = " << endl;
cin >> a;
cout << "Число b = " << endl;
cin >> b;
s = a - b;
cout << "\n" << a << " * " << b << " = "<< s << endl;
break;
case 3:
cout << "Число a = " << endl;
cin >> a;
cout << "Число b = " << endl;
cin >> b;
s = a * b;
cout << "\n" << a << " * " << b << " = "<< s << endl;
break;
case 4:
cout << "Число a = " << endl;
cin >> a;
cout << "Число b = " << endl;
cin >> b;
s = a / b;
cout << "\n" << a << " / " << b << " = "<< s << endl;
break;
}
return 0;
}
1
VAR p:real;
i,n:integer;
BEGIN
p:=1;
read(n);
for i:= n downto 1 do
p:= p*i;
writeln(p:4:2);
end.