StringEx22-01-14

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        public static bool AandB(string st, int start, int finish) //ex21
        {
            string sub = st.Substring(start, finish - start);
            int countA = 0, countB = 0;
            for (int i = 0; i < sub.Length; i++)
                if (sub[i] == 'a')
                    countA++;
                else if (sub[i] == 'b')
                    countB++;
            return countA == countB;
        }
        public static string ReplaceWith(string text, string replaced, string with) //ex12
        {
            text = text.Replace(replaced, with);
            return text;
        }
        public static int CountApps(string text, string word) //ex10
        {
            int count = 0;
            for (int i = 0; i < text.Length - word.Length; i++)
            {
                if (text.IndexOf(word, i) > 0)
                    count++;
            }
            return count;
        }
        public static int StartsWith(string[] a, string s) //ex9
        {
            int count = 0;
            for (int i = 0; i < a.Length; i++)
                if (a[i].IndexOf(s) == 0)
                    count++;
            return count;
        }
        static void Main(string[] args) //commented out - ex9's main
        {
            int count = 0, kMax = 6;
            string st;
            st = Console.ReadLine();
            for (int i = 0; i < st.Length - 2; i++)
            {
                if (st.Length - i < 6)
                    kMax = st.Length - i;
                for (int k = 2; k < kMax; k++)
                {
                    if (AandB(st, i, i + k))
                        count++;
                }
            }
            Console.WriteLine("Amount of substrings: " + count);
            //string[] arr = new string[5];
            //string st;
            //for (int i = 0; i < arr.Length; i++)
            //{
            //    Console.WriteLine("Word no. " + (i + 1));
            //    arr[i] = Console.ReadLine();
            //}
            //Console.WriteLine("Word: ");
            //st = Console.ReadLine();
            //Console.WriteLine(StartsWith(arr, st) + " words start with " + st);
        }
    }
}