All6

// 2
Console.WriteLine("Enter 2 number");
int x = int.Parse(Console.ReadLine());
int y = int.Parse(Console.ReadLine());
int sum = 0;
for (int i = 1; i <= y; i++)
{
sum = sum + i * (i + x);
}
Console.WriteLine("The result is " + sum);

// 3
double x = double.Parse(Console.ReadLine());
char op = char.Parse(Console.ReadLine());
double y = double.Parse(Console.ReadLine());
while (x != 0 && y != 0)
{
if (op == '+')
{
Console.WriteLine("= " + (x + y));
}
if (op == '-')
{
Console.WriteLine("= " + (x - y));
}
if (op == '*')
{
Console.WriteLine("= " + (x * y));
}
if (op == '/')
{
Console.WriteLine("= " + (x / y));
}
x = double.Parse(Console.ReadLine());
op = char.Parse(Console.ReadLine());
y = double.Parse(Console.ReadLine());
}