CPE263 Week Homework ASCII

Week 6 Homework ASCII

ASCII (American Standard Code for Information Interchange) is a character encoding standard that represents text in computers and communication equipment.

Key Features of ASCII:

Character Set:

• ASCII defines a set of 128 characters, including:
• Uppercase letters (A-Z)
• Lowercase letters (a-z)
• Digits (0-9)
• Special characters (e.g., punctuation marks like .,;!?, symbols like @#$%^&*)
• Control characters (e.g., newline, carriage return, tab)

---

Code

Encoder

private void runEn_Click(object sender, EventArgs e)
{
    string input = txtInEn.Text.ToUpper();
    int key = Convert.ToInt32(txtKeyEn.Text);
    string result = "";
    foreach (char data in input)
    {
        int asc = (int)data;
        int ans = asc + key;
        char res;
        if (ans > 90)
        {
            ans = (ans - 26);
        }
        res = (char)ans;
        result += res;
    }
    txtOutEn.Text = result;
}

---

Decoder

private void btnDe_Click(object sender, EventArgs e)
{
    string input = txtInDe.Text.ToUpper();
    int key = Convert.ToInt32(txtKeyDe.Text);
    string result = "";
    foreach (char data in input)
    {
        int asc = (int)data;
        int ans = asc - key;
        char res;
        if (ans < 65)
        {
            ans = (ans + 26);
        }
        res = (char)ans;
        result += res;
    }
    txtOutDe.Text = result;
}

---

All

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 WindowsFormsApp5
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void runEn_Click(object sender, EventArgs e)
        {
            string input = txtInEn.Text.ToUpper();
            int key = Convert.ToInt32(txtKeyEn.Text);
            string result = "";

            foreach (char data in input)
            {
                int asc = (int)data;
                int ans = asc + key;
                char res;
                if (ans > 90)
                {
                    ans = (ans - 26);
                }
                res = (char)ans;
                result += res;
            }
            txtOutEn.Text = result;
        }

        private void btnDe_Click(object sender, EventArgs e)
        {
            string input = txtInDe.Text.ToUpper();
            int key = Convert.ToInt32(txtKeyDe.Text);
            string result = "";
            foreach (char data in input)
            {
                int asc = (int)data;
                int ans = asc - key;
                char res;
                if (ans < 65)
                {
                    ans = (ans + 26);
                }
                res = (char)ans;
                result += res;
            }
            txtOutDe.Text = result;
        }
    }
}

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