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// Hình Chữ Nhật using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace WindowsFormsApp3 { class HCN { public int cd; public int cr; public HCN(int cd,int cr) { this.cd = cd; this.cr = cr; } public int tinhDT() { return cd * cr; } public int tinhCV() { return (cd + cr) * 2; } public String xuatTT() { return "dt: " + tinhDT() + " cv: " + tinhCV(); } } } // Hình Hộp using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace WindowsFormsApp3 { class HH : HCN { public int cc; public HH(int cd,int cr,int cc):base(cd,cr) { this.cc = cc; } public int tinhTT() { re...

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 WindowsFormsApp3 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void checkBox1_CheckedChanged(object sender, EventArgs e) { if(checkBox1.Checked==true) { label3.Enabled = true; textBox3.Enabled = true; } else { label3.Enabled = false; textBox3.Enabled = false; } } private void button1_Click(object sender, EventArgs e) { int cd=int.Parse(textBox1.Text); int cr = int.Parse(textBox2.Text); if(checkBox1.Checked==true)//hinh hop { int cc = int.Parse(te...

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace WindowsFormsApp3 { class HCN { public int cd; public int cr; public HCN(int cd,int cr) { this.cd = cd; this.cr = cr; } public int tinhDT() { return cd * cr; } public int tinhCV() { return (cd + cr) * 2; } public String xuatTT() { return "dt: " + tinhDT() + " cv: " + tinhCV(); } } }

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace WindowsFormsApp3 { class HH : HCN { public int cc; public HH(int cd,int cr,int cc):base(cd,cr) { this.cc = cc; } public int tinhTT() { return tinhDT() * cc; } public String xuatTT() { return base.xuatTT() + " tt: " + tinhTT(); } } }