# C# program to find the sum of odd digits of the product of two numbers.

Posted by Rajnilari2015 under C# category on | Points: 40 | Views : 268
Let us say we have two numbers num1 = 19 and num2 = 65. The product of num1 and num 2 is 1235.
The odd numbers are 1,3 and 5 and their sum is 9. The below program will do so

`using System;using System.Linq;using System.Numerics;namespace ConsoleApplication2{    class Program    {               static void Main(string[] args)        {            BigInteger num1 = 19;            BigInteger num2 = 65;           	    //Approach 1            Console.WriteLine("The sum of odd digits of the product of {0} and {1} is {2}", num1, num2,             (num1 * num2)                .ToString()                .ToCharArray()                .Where(w => Convert.ToInt32(w) % 2 != 0)                .Select(c => c - 48)                .Sum());	    //Approach 2            Console.WriteLine("The sum of odd digits of the product of {0} and {1} is {2}", num1, num2,               Array.ConvertAll((num1 * num2)                .ToString()                .ToCharArray()                .Where(w => Convert.ToInt32(w) % 2 != 0).ToArray(), c => (int)Char.GetNumericValue(c))                .Sum());                        Console.ReadKey();        }     }}`

`Output------------The sum of odd digits of the product of 19 and 65 is 9`