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

0 vote384 views3 answers
System.Windows.Forms.DataGridView.CurrentRow.get returned null. c#
C#
0 vote341 views1 answer
Query associative table ef6
C#
8 votes355 views3 answers
C# combobox selected item
C#
1 vote358 views1 answer
Add text to combobox c#
C#
0 vote327 views1 answer
Csharp functions
C#
0 vote346 views1 answer
Dicionário c# foreach keyvaluepair
C#
2 votes346 views1 answer
C# array of objects
C#
0 vote340 views1 answer
C# get witdh of matrix
C#
23 votes358 views3 answers
C# foreach on a dictionary
C#
6 votes383 views1 answer
How to play video in ui unity
C#