public static void Main()
Console.Write("Enter frist number:");
int num1 = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter last number:");
int num2 = Convert.ToInt32(Console.ReadLine());
Console.Write("Last number must be larger than first number,please enter again :");
num2 = Convert.ToInt32(Console.ReadLine());
Console.Write("Enter factor:");
int num3 = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("The multiple of "+num3+" between "+num1+" and "+num2+" are :");