Random weighted stock

generateRandomStock

using System;
using System.Collections.Generic;

// generateRandomStock: Generate a random stock weighted according to the value of the stock
// 
// key: Stock Name
// Value: The number of times this stock is traded in a given day

namespace generateRandomStock
{
    public class Program
    {
        static Dictionary<string, int> tradingMap = new Dictionary<string, int>();
        static List<string> allStocks = new List<string>();
        
        public static void Main(string[] args)
        {
            tradingMap.Add("msft", 233);
            tradingMap.Add("goog", 1052);
            tradingMap.Add("appl", 10678);
            
            init();
            var stockToBuy = generateRandomStock();
            
            Console.WriteLine("Get {0} stock", stockToBuy);
        }
        
        static void init() {
            int totalStockCount = 0;
            
            foreach (var stock in tradingMap.Keys) {
                totalStockCount += tradingMap[stock];
            }
              
            foreach (var stock in tradingMap.Keys) {
                double percentage = ((double) tradingMap[stock] / (double) totalStockCount) * 100; 
                int entries =  (int)(Math.Ceiling(percentage));
               
                for (int i = 0; i < entries; i++) {
                    allStocks.Add(stock);
                }
            }
            
        }
        
        static string generateRandomStock() {
            var random = new Random();
            var index = random.Next(allStocks.Count);
            
            return allStocks[index];
        }
    }
}