Find 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

1 vote179 views1 answer
C# writteline
C#
0 vote160 views1 answer
Wpf textblock line break code behind
C#
0 vote124 views1 answer
Partial view with model in multiple views
C#
0 vote131 views1 answer
C# verify "no other" call xunit
C#
-1 vote243 views1 answer
Make sprite invisible unity
C#Unity
0 vote183 views3 answers
Loops in coding
C#
4 votes127 views2 answers
Append char to string c#
C#
2 votes185 views2 answers
How to filter a list in c#
C#
0 vote227 views1 answer
Asp net saber ip address of client machine IIS
C#
0 vote206 views1 answer
Générer un nombre aléatoire en c#
C#