Vežba 06, Zadatak 3

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Vezba_06_2017_Zadatak2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Dictionary<char, int> letters = new Dictionary<char, int>();

            string s = textBox1.Text;
            foreach(char c in s)
            {
                if (letters.Keys.Contains(c))
                    letters[c]++;
                else
                    letters.Add(c, 1);
            }

            StringBuilder sb = new StringBuilder();
            foreach (char c in letters.Keys)
            {
                sb.AppendFormat("Slovo {0} se pojavljuje {1} puta", c, letters[c]);
                sb.AppendLine();
            }

            textBox2.Text = sb.ToString();


        }

        private void button2_Click(object sender, EventArgs e)
        {
            Close();
        }
    }
}