câu 12:
using System;
using
System.Collections.Generic;
using
System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using
System.Windows.Forms;
using
Microsoft.VisualBasic;
namespace Bai12_Matran
{
public partial
class Form1
: Form
{
public
Form1()
{
InitializeComponent();
}
int[,]
A, B;
private
int[,] NhapMatran(int
n)
{
int[,]
A = new int[n,
n];
for
(int i = 0; i < n; i++)
for
(int j = 0; j < n; j++)
{
string
tg = Interaction.InputBox("A[" + i.ToString() + j.ToString() + "]", "Nhập
phần tử");
A[i, j] = int.Parse(tg);
}
return
A;
}
private void HienMatran(int[,]
A, int n, RichTextBox
rtb)
{
rtb.Text = "";
for
(int i = 0; i < n; i++)
{
for
(int j = 0; j < n; j++)
{
rtb.Text += A[i,
j].ToString()+" ";
}
rtb.Text += "\n";
}
}
private void btNhapA_Click(object
sender, EventArgs e)
{
int
n = int.Parse(txtKichthuoc.Text);
A = NhapMatran(n);
HienMatran(A, n, rtb_MatranA);
}
private void btNhapB_Click(object
sender, EventArgs e)
{
//B = Nhapmt(rtb_MatranB);
int
n = int.Parse(txtKichthuoc.Text);
B = NhapMatran(n);
HienMatran(B,n, rtb_MatranB);
//rtb_MatranB.Text=
HienMatran(B, n);
}
private
int[,] Tinhtich(int[,]
A, int[,] B, int
n)
{
int[,]
C = new int[n,
n];
for
(int i = 0; i < n; i++)
{
for
(int j = 0; j < n; j++)
{
C[i,j] = 0;
for
(int k = 0; k < n; k++)
{
C[i,j] += A[i, k] *
A[k, j];
}
}
}
return
C;
}
private void bt_Tich_Click(object
sender, EventArgs e)
{
int
n = int.Parse(txtKichthuoc.Text);
HienMatran(Tinhtich(A,B,n),n,
rtb_MatranTich);
}
=======================================================
câu 16
using System;
using
System.Collections.Generic;
using
System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using
System.Windows.Forms;
namespace
Bài_16_radiobuttun
{
public partial
class Form1
: Form
{
public
Form1()
{
InitializeComponent();
}
private void txtNhap_TextChanged(object
sender, EventArgs e)
{
if
(txtNhap.Text != "")
{
try
{
int
n = int.Parse(txtNhap.Text);
}
catch
{
MessageBox.Show("Hãy nhập số nguyên");
txtNhap.Clear();
txtNhap.Focus();
}
}
}
private bool KTNT(int n)
{
bool
kt = true;
for
(int i = 2; i <= n / 2; i++)
{
if
(n % i == 0) { kt = false; break; }
}
return
kt;
}
private bool KTCP(int n)
{
return ((double)n ==Math.Pow(Math.Floor(Math.Sqrt(n)),2));
}
private int TinhTong(int n)
{
int
t = 0;
while
(n > 0)
{
t += n % 10;
n = n / 10;
}
return
t;
}
private void rdbKTNT_Click(object
sender, EventArgs e)
{
int
n = int.Parse(txtNhap.Text);
if
(KTNT(n) == true) lbKQ.Text = "Kết quả: " + n.ToString() + " là số nguyên tố";
else
lbKQ.Text = "Kết quả: " + n.ToString() + "
không phải là số nguyên tố";
}
private void rdbKTCP_CheckedChanged(object
sender, EventArgs e)
{
int
n = int.Parse(txtNhap.Text);
if
(KTCP(n) == true) lbKQ.Text = "Kết quả: " + n.ToString() + " là số chính phương";
else
lbKQ.Text = "Kết quả: " + n.ToString() + " không phải là số chính phương";
}
private void rdbTinhtong_Click(object
sender, EventArgs e)
{
int
n = int.Parse(txtNhap.Text);
lbKQ.Text = "Kết quả: Tổng các chữ số của " + n.ToString() + " là " + TinhTong(n).ToString();
}
}
}
==============================================
câu 23
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace Bài_23_Chọn_kiểu_chữ
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void
rdRed_CheckedChanged(object sender, EventArgs e)
{
rtbChuoi.ForeColor = Color.Red;
}
private void btXoa_Click(object sender, EventArgs
e)
{
rtbChuoi.Clear();
rtbChuoi.Focus();
}
private void
btThoat_Click(object sender, EventArgs e)
{
if (DialogResult.Yes
== MessageBox.Show("Bạn
có chắc chắn muốn thoát không?", "Thông
báo", MessageBoxButtons.YesNo))
this.Close();
}
private void
chkDam_CheckedChanged(object sender, EventArgs e)
{
rtbChuoi.Font = new Font(rtbChuoi.Font.Name,
rtbChuoi.Font.Size,
rtbChuoi.Font.Style^FontStyle.Bold);
}
private void
chkNghieng_CheckedChanged(object sender, EventArgs e)
{
rtbChuoi.Font = new Font(rtbChuoi.Font.Name,
rtbChuoi.Font.Size,
rtbChuoi.Font.Style ^ FontStyle.Italic);
}
private void
chkGachchan_CheckedChanged(object sender, EventArgs e)
{
rtbChuoi.Font = new Font(rtbChuoi.Font.Name,
rtbChuoi.Font.Size,
rtbChuoi.Font.Style ^FontStyle.Underline);
}
private void rdbDo_Click(object sender, EventArgs
e)
{
rtbChuoi.ForeColor = Color.Red;
}
private void
rdbDen_Click(object sender, EventArgs e)
{
rtbChuoi.ForeColor = Color.Black;
}
private void
rdbXanhla_Click(object sender, EventArgs e)
{
rtbChuoi.ForeColor = Color.Green;
}
private void
rdbVang_Click(object sender, EventArgs e)
{
rtbChuoi.ForeColor = Color.Yellow;
}
private void
rdbXanhduong_Click(object sender, EventArgs e)
{
rtbChuoi.ForeColor = Color.Blue;
}
private void
rdbTim_Click(object sender, EventArgs e)
{
rtbChuoi.ForeColor = Color.Magenta;
}
}
}
================================================
câu 24
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace Bài_23_Chọn_kiểu_chữ
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void
rdRed_CheckedChanged(object sender, EventArgs e)
{
rtbChuoi.ForeColor = Color.Red;
}
private void btXoa_Click(object sender, EventArgs
e)
{
rtbChuoi.Clear();
rtbChuoi.Focus();
}
private void
btThoat_Click(object sender, EventArgs e)
{
if (DialogResult.Yes
== MessageBox.Show("Bạn
có chắc chắn muốn thoát không?", "Thông
báo", MessageBoxButtons.YesNo))
this.Close();
}
private void
chkDam_CheckedChanged(object sender, EventArgs e)
{
rtbChuoi.Font = new Font(rtbChuoi.Font.Name,
rtbChuoi.Font.Size,
rtbChuoi.Font.Style^FontStyle.Bold);
}
private void
chkNghieng_CheckedChanged(object sender, EventArgs e)
{
rtbChuoi.Font = new Font(rtbChuoi.Font.Name,
rtbChuoi.Font.Size,
rtbChuoi.Font.Style ^ FontStyle.Italic);
}
private void
chkGachchan_CheckedChanged(object sender, EventArgs e)
{
rtbChuoi.Font = new Font(rtbChuoi.Font.Name,
rtbChuoi.Font.Size,
rtbChuoi.Font.Style ^FontStyle.Underline);
}
private void rdbDo_Click(object sender, EventArgs
e)
{
rtbChuoi.ForeColor = Color.Red;
}
private void
rdbDen_Click(object sender, EventArgs e)
{
rtbChuoi.ForeColor = Color.Black;
}
private void
rdbXanhla_Click(object sender, EventArgs e)
{
rtbChuoi.ForeColor = Color.Green;
}
private void
rdbVang_Click(object sender, EventArgs e)
{
rtbChuoi.ForeColor = Color.Yellow;
}
private void
rdbXanhduong_Click(object sender, EventArgs e)
{
rtbChuoi.ForeColor = Color.Blue;
}
private void
rdbTim_Click(object sender, EventArgs e)
{
rtbChuoi.ForeColor = Color.Magenta;
}
}
}
===================================================
câu 27
using System;
using
System.Collections.Generic;
using
System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using
System.Windows.Forms;
namespace ComboBox
{
public partial
class Form1
: Form
{
public
Form1()
{
InitializeComponent();
ComboBox_Load();
}
private
void ComboBox_Load()
{
// Đưa các font chữ vào ComboBox
Font
FontFamily[] ff = FontFamily.Families;
for
(int i = 0; i < ff.Length; i++)
{
cbFont.Items.Add(ff[i].Name);
}
// Đưa các cỡ chữ vào ComboBox
Size
for
(int i = 8; i <= 72; i++)
{
cbSize.Items.Add(i);
}
}
private
void comboBox1_SelectedIndexChanged(object sender, EventArgs
e)
{
rtbString.Font = new Font(cbFont.Text, rtbString.Font.Size);
}
private
void cbSize_SelectedIndexChanged(object sender, EventArgs
e)
{
rtbString.Font= new Font(rtbString.Font.Name,
float.Parse(cbSize.Text));
}
private
void button1_Click(object
sender, EventArgs e)
{
rtbString.Clear();
}
private
void button2_Click(object
sender, EventArgs e)
{
this.Close();
}
}
}
===================================================
câu 30
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace Bài_30_string
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private string chuanhoa(string s)
{
s = s.Trim();
int i = 0;
while (i < s.Length)
{
if ((s[i] == '
') && (s[i + 1] == ' '))
s = s.Remove(i, 1);
else i++;
}
return s;
}
private void
btchuanhoa_Click(object sender, EventArgs e)
{
rtbKQ.Text = chuanhoa(rtbNhap.Text);
}
private void btDem_Click(object sender, EventArgs
e)
{
string s = chuanhoa(rtbNhap.Text);
int d = 0;
for (int i = 0; i
< s.Length; i++)
{
if (s[i] == '
') d++;
}
rtbKQ.Text = "Số từ trong xâu là: " +(d+1).ToString();
}
}
}
