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 vote140 views1 answer
Why doesnt the if command work in C#
C#
24 votes120 views6 answers
Convert to base64 c#
C#
6 votes118 views2 answers
Unity play sound effect
C#
1 vote159 views1 answer
C# settings file
C#
35 votes132 views4 answers
C sharp list length
C#
0 vote123 views1 answer
.net core Enable-Migrations' is not recognized as the name of a cmdlet
C#
0 vote132 views1 answer
C# loop xml
C#
0 vote128 views1 answer
Cdn providers
C#
18 votes128 views6 answers
C# add to array
C#
1 vote171 views1 answer
How to configure visual studio for unity
C#Unity