DO WHILE ORNEK :


class Program
{
static void Main(string[] args)
{
Console.WriteLine("Enter the integer n number:");
int n = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("Enter the integer m number");
int m = Convert.ToInt32(Console.ReadLine());

int sum = 0;

do
{
sum += n;
n++;
} while (n <= m);

Console.WriteLine($"The sum from n to m is {sum}");
Console.ReadKey();
}
}



FOR ORNEK :
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Enter the integer n number:");
int n = Convert.ToInt32(Console.ReadLine());

Console.WriteLine("Enter the integer m number");
int m = Convert.ToInt32(Console.ReadLine());

int sum = 0;

for(int i = n; i <= m; i++)
{
sum += i;
}

Console.WriteLine($"Sum from n to m is {sum}");

Console.ReadKey();

}
}