C# Program to Generate the Sum of N Numbers

In C#, you can create a program to calculate the sum of N numbers by taking input from the user or by reading the numbers from an array. The basic idea is to use a loop to iterate through the numbers and accumulate their sum.

Problem Statement

You are tasked with creating a C# program that calculates the sum of N numbers.

C# Program to Generate the Sum of N Numbers

using System;

class Program
{
    static void Main()
    {
        Console.Write("Enter the value of N: ");
        if (int.TryParse(Console.ReadLine(), out int n))
        {
            int sum = 0;

            for (int i = 1; i <= n; i++)
            {
                Console.Write("Enter number #{0}: ", i);
                if (int.TryParse(Console.ReadLine(), out int num))
                {
                    sum += num;
                }
                else
                {
                    Console.WriteLine("Invalid input. Please enter a valid number.");
                    i--; // Decrement i to re-enter the same number.
                }
            }

            Console.WriteLine("The sum of the {0} numbers is: {1}", n, sum);
        }
        else
        {
            Console.WriteLine("Invalid input for N. Please enter a valid integer.");
        }
    }
}

How it Works

1. Input N:
   • The program begins by asking the user to enter an integer N, which represents the total number of values to be summed.
2. Initialize Variables:
   • The program initializes a variable sum to 0. This variable will be used to accumulate the sum of the numbers.
3. Loop Through the Numbers:
   • The program uses a for loop to iterate N times, starting from 1 and going up to N.
4. Input Numbers:
   • Inside the loop, for each iteration, the program does the following:
     • It either prompts the user to enter a number, or if you have an array of numbers, it accesses each element one by one.
5. Accumulate Sum:
   • After obtaining a number (either from the user or the array), the program adds that number to the sum variable. This step accumulates the sum of the numbers as the loop iterates.
6. Display Result:
   • After the loop has completed, the program displays the final value of the sum variable. This value represents the sum of the N numbers entered or read from the array.
7. Error Handling (Optional):
   • Optionally, you can include error handling to ensure that the user enters valid numbers. If an invalid input is provided (e.g., a non-numeric value), the program can display an error message and ask the user to re-enter the number.

Input/ Output