Answer to Question #296871 in C# for chi

Question

Topic: Function

Write a function-­‐oriented program that calculates the sum of the sequence number from 1 to n. Thus, if the input is 5, the output should be 15

because:

1 + 2 + 3 + 4 + 5 = 15

Note: you can choose any looping statement if needed.

Answer 1

using System;


public class HelloWorld
{
    static void Sum(int n)
    {
        int count = n * (n + 1) / 2;
        Console.WriteLine($"Sum from 1 to {n} = {count}");
    }
    
    public static void Main(string[] args)
    {
        Console.Write("Enter n: ");
        int n = int.Parse(Console.ReadLine());
        Sum(n);
    }
}