Question

Problem:Given a comma separated string of numbers, want to find out the highest average of digits of number.
for eg: consider a string of number “123,345,555” the output would be 5 since 5 is the highest average among 123,345,555.

Here is my program..in C#

int Max_Avg(string number_list)
{
      int i;
        Int32 sum;
        Int32 max_avg = 0;
        int limit = 0;
        string[] num = number_list.Split(',');
        limit = num.Length;
        while (limit-- > 0)
        {
                i=0;
                sum = 0;
                while (i < num[limit].Length)
                {
                    sum += Convert.ToInt32(num[limit].Substring(i, 1));
                    i++;
                }
                int tmp=sum / num[limit].Length;
                if (tmp > max_avg)
                {
                    max_avg = tmp;
                }
        }
         return max_avg;
}

If any can one can optimize its performance or suggest a more optimised approach to speed it up …..

Answer 1

(optimized for maintainability / code, rather than raw performance)

return (int) number_list.Split(',')
       .Select(term => term.Average(c => (int) (c - '0'))).Max();