Sum of multiples of a number

// C# program to find sum of multiples
// of a number up to N efficiently
using System;
 
class GFG {
 
    // Function for calculating sum
    // of multiples of a upto N
    static int calculate_sum(int a, int N)
    {
 
        // Number of multiples
        int m = N / a;
 
        // sum of first m natural numbers
        int sum = m * (m + 1) / 2;
 
        // sum of multiples
        int ans = a * sum;
 
        return ans;
    }
 
    // Driver code
    public static void Main()
    {
 
        int a = 7, N = 49;
        Console.WriteLine("Sum of multiples of " + a +
         " up to " + N + " = " + calculate_sum(a, N));
    }
}

Source: geeksforgeeks.org

Similar codes

0 vote406 views1 answer
Unity read from text file
C#Unity
1 vote379 views1 answer
Filedialog get folder path c#
C#
0 vote412 views2 answers
Remove all non alphabetic characters from string c#
C#
-1 vote323 views2 answers
Remove specific character from string c#
C#
8 votes348 views1 answer
C# get first 5 characters of string
C#
3 votes340 views1 answer
C# dictionary first
C#
0 vote325 views1 answer
C# foreach loop async but wait at end
C#
0 vote352 views1 answer
Using selected item in listbox c# to fill texbox
C#
0 vote387 views1 answer
C# int to string date conversion
C#
0 vote390 views1 answer
C# array display
C#