using System;
 
class HelloWorld {
     //tao mot ham tu dinh nghia nhan hai tham so
        public static int Sum(int num1, int num2)
        {
            int total;
            total = num1 + num2;
            return total;
        }
 
        public static void Main()
        {
            Console.Write("\nTao ham tu dinh nghia de tinh tong hai so trong C#:\n");
            Console.Write("--------------------------------------------------\n");
            Console.Write("Nhap so hang thu nhat: ");
            int n1 = 30;
            Console.Write("Nhap so hang thu hai: ");
            int n2 = 50;
            //goi ham tu dinh nghia
            Console.WriteLine("\nTong hai so: {0} \n", Sum(n1, n2));
 
 
        }   
}
 

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