Lập trinh C++ code máy tính bỏ túi

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

//lyvantuan//mangmaytinh

namespace MayTinh2

{

public partial class Form1 : Form

{

public bool clickBang = false;

public string ketQua="";

public double x, y,z, x1, x2,min;

public double a1 = 0, b1 = 0, c1 = 0,d1=0, a2 = 0, b2 = 0, c2 = 0,d2=0,a3=0,b3=0,c3=0,d3=0;

public double a = 0, b = 0, c = 0;

public int mode = 1;

public int ngoacTrai = 0;

public int ngoacPhai = 0;

public const double PI = 3.141592654;

public const double E = 2.718281828;

public Form1()

{

InitializeComponent();

}

public double tinhTich(string str)

{

double tich = 0;

int l = 0;

string s1 = str.Substring(l, 1);

string s2 = "";

string dau = "";

while (s1 != "*" && s1 != "/" && l < str.Length)

{

s2 = s2 + str.Substring(l, 1);

l++;

if (l == str.Length) break;

s1 = str.Substring(l, 1);

}

tich = double.Parse(s2);

//dau=str.Substring(l,1);

while (l < str.Length)

{

string s3 = "";

dau = str.Substring(l, 1);

l++;

s1 = str.Substring(l, 1);

while (s1 != "*" && s1 != "/" && l < str.Length)

{

s3 = s3 + str.Substring(l, 1);

l++;

if (l == str.Length) break;

s1 = str.Substring(l, 1);

}

if (dau == "*")

{

tich = tich * double.Parse(s3);

continue;

}

if (dau == "/")

{

tich = tich / double.Parse(s3);

continue;

}

}

return tich;

}

public double tinhKetQua(string str)

{

int l = str.Length;

double result = 0;

while (l > 0)

{

string s1 = "";

string dau = "";

string s = str.Substring(l - 1, 1);

while (s != "+" && s != "-" && s != "*" && s != "/" && l > 0) {

s1 = str.Substring(l - 1, 1) + s1;

l ;

if (l == 0) break;

s = str.Substring(l - 1, 1);

}

if (l == 0)

dau = "";

else

dau = str.Substring(l - 1, 1);

if (dau == "")

{

result += double.Parse(s1);

}

if (dau == "+")

{

result = result + double.Parse(s1);

l ;

continue;

}

if (dau == "-")

{

result = result - double.Parse(s1);

l ;

continue;

}

if (dau == "*" || dau == "/")

{

string str_s1 = str.Substring(l - 1, 1);

string str_s2 = s1;

string d = "";//dấu + or - trước tích:-(3*3*5)

while (str_s1 != "+" && str_s1 != "-" && l > 0)

{

str_s2 = str.Substring(l - 1, 1) + str_s2;

l ;

if (l == 0) break;

str_s1 = str.Substring(l - 1, 1);

}

if (l == 0)

d = "+";

else

d = str.Substring(l - 1, 1);

if (d == "+")

{

result += tinhTich(str_s2);

l ;

}

if (d == "-")

{

result -= tinhTich(str_s2);

l ;

}

}

}

return result;

}

public string DaoDau(string str)

{

string result = "";

int i = str.Length - 1;

while (i >= 0)

{

result += str.Substring(i, 1);

i ;

}

return result;

}

public string chuoiCongVoiNgoacCoDauTru(string str)

{

string result = "";

int i = 0;

while (i < str.Length)

{

//Xu ly 9

if (str.Substring(i, 1) == "-" && str.Substring(i + 1, 1) ==

"-")

{

result += "+";

i = i + 2;

}

//Xu ly +-9

if (str.Substring(i, 1) == "+" && str.Substring(i + 1, 1) ==

"-")

{

result += "-";

i = i + 2;

}

//Xu ly ++9

if (str.Substring(i, 1) == "+" && str.Substring(i + 1, 1) ==

"+")

{

result += "+";

i = i + 2;

}

else

{

result += str.Substring(i, 1);

i++;

}

}

return result;

}

public string chuoiNhanVoiNgoacCoDauTru(string str)

{

if (str.Substring(0, 1) != "+" && str.Substring(0, 1) != "-") str = "+" + str;

string result = "";

int i = str.Length - 1;

while (i >= 0)

{

if (str.Substring(i, 1) == "-" && i > 0 && (str.Substring(i -

1, 1) == "*" || str.Substring(i - 1, 1) == "/"))

{

string chuoitam = str.Substring(i - 1, 1);//Lay dau nhan hoac chia

int vitridaunhan = i - 1;

i = i - 2;//Vuot qua dau tru,nhan

//Tim vi tri dau + or -gan nhat

//

while ((str.Substring(i, 1) != "+" && str.Substring(i, 1) != "-") && i > 0)

{

chuoitam += str.Substring(i, 1);

i ;

}

//MessageBox.Show("Vi tri do la " + i);

//Khi gap dau

string dau;

if (str.Substring(i, 1) == "-")

dau = "+";

else

dau = "-";

chuoitam += dau;

//Vuot qua dau doi

i ;

result += chuoitam;

}

else

{

result += str.Substring(i, 1);

i ;

}

}

return (DaoDau(result));

}

public string chinhLaiDau(string str)

{

string s1, s2;

s2 = chuoiCongVoiNgoacCoDauTru(str);

s1 = chuoiNhanVoiNgoacCoDauTru(s2);

return s1;

}

public string XuLyNgoac(string str, int l)

{

string s = "";

string ketQua = "";

while (l > 0)

{

if (str.Substring(l - 1, 1) == ")")

{

l ;

s = XuLyNgoac(str, l);

str = s + ketQua;

l = str.Length;

ketQua = "";

}

else

{

if (str.Substring(l - 1, 1) == "(")

{

return (str.Substring(0, l - 1) + tinhKetQua(chinhLaiDau(ketQua)).ToString());

}

ketQua = str.Substring(l - 1, 1) + ketQua; l ;

}

}

return chinhLaiDau(ketQua);

}

public string XuLyChuoiCoSin(string str)

{

string result = "";

int i = 0;

while (i < str.Length)

{

//Xu ly Sin(9+3)

string chuoitam = "";

double sin, s;

if (str.Substring(i, 1) == "s" && str.Substring(i + 3, 1) ==

"(")

{

//vuot qua sin(

i = i + 4;

int daumongoac = 1;

int daudongngoac = 0;

while (daumongoac != daudongngoac)

{

chuoitam += str.Substring(i, 1);

if (str.Substring(i, 1) == "(")

daumongoac++;

if (str.Substring(i, 1) == ")")

daudongngoac++;

i++;

}

//Lui lai sau

i ;

string u, v;

u = XuLyNgoac(chuoitam, chuoitam.Length);

v = chinhLaiDau(u);

s = tinhKetQua(v);

//Doi qua do

s = s * Math.PI / 180;

//u = double.Parse(s);

sin = Math.Sin(s);

result += sin.ToString();

//vuot qua )

i++;

}

else

{

result += str.Substring(i, 1);

i++;

}

}

return result;

}

public string XuLyChuoiCoCos(string str)

{

string result = "";

int i = 0;

while (i < str.Length)

{

//Xu ly Sin(9+3)

string chuoitam = "";

double sin, s;

if (str.Substring(i, 1) == "c" && str.Substring(i + 3, 1) ==

"(")

{

//vuot qua sin(

i = i + 4;

int daumongoac = 1;

int daudongngoac = 0;

while (daumongoac != daudongngoac)

{

chuoitam += str.Substring(i, 1);

if (str.Substring(i, 1) == "(")

daumongoac++;

if (str.Substring(i, 1) == ")")

daudongngoac++;

i++;

}

//Lui lai sau

i ;

string u, v;

u = XuLyNgoac(chuoitam, chuoitam.Length);

v = chinhLaiDau(u);

s = tinhKetQua(v);

//Doi qua do

s = s * Math.PI / 180;

//u = double.Parse(s);

sin = Math.Cos(s);

result += sin.ToString();

//vuot qua )

i++;

}

else

{

result += str.Substring(i, 1);

i++;

}

}

return result;

}

public string XuLyChuoiCoTan(string str)

{

string result = "";

int i = 0;

while (i < str.Length)

{

//Xu ly Sin(9+3)

string chuoitam = "";

double sin, s;

if (str.Substring(i, 1) == "t" && str.Substring(i + 3, 1) ==

"(")

{

//vuot qua sin(

i = i + 4;

int daumongoac = 1;

int daudongngoac = 0;

while (daumongoac != daudongngoac)

{

chuoitam += str.Substring(i, 1);

if (str.Substring(i, 1) == "(")

daumongoac++;

if (str.Substring(i, 1) == ")")

daudongngoac++;

i++;

}

//Lui lai sau

i ;

string u, v;

u = XuLyNgoac(chuoitam, chuoitam.Length);

v = chinhLaiDau(u);

s = tinhKetQua(v);

//Doi qua do

s = s * Math.PI / 180;

//u = double.Parse(s);

sin = Math.Tan(s);

result += sin.ToString();

//vuot qua )

i++;

}

else

{

result += str.Substring(i, 1);

i++;

}

}

return result;

}

public string XuLyChuoiCoSinCosTan(string str)

{

string u, v, result;

u = XuLyChuoiCoSin(str);

v = XuLyChuoiCoCos(u);

result = XuLyChuoiCoTan(v);

return result;

}

public bool KiemTraLoiChuoi(string chuoi)

{

string s1;

string s2;

if (txt_pheptinh.Text == "") return true;

if (ngoacTrai != ngoacPhai) return true;

int l = chuoi.Length;

s1 = chuoi.Substring(l-1, 1);

if (s1 == "+" || s1 == "-" || s1 == "/" || s1 == "*") return true; for (int i = 0; i < l - 1; i++)

{

s1 = chuoi.Substring(i, 1);

s2 = chuoi.Substring(i + 1, 1);

if(s1=="1"||s1=="2"||s1=="3"||s1=="4"||s1=="5"||s1=="6"|| s1=="7"||s1=="8"||s1=="9"||s1=="0")

if (s2 == "s" || s2 == "c" || s2 == "t") return true;

if (s1 == ")")

if (s2 == "s" || s2 == "c" || s2 == "t") return true; if(s1=="(")

if(s2==")") return true;

if (s1 == "/" || s1 == "*" || s1 == "+" || s1 == "-" || s1 ==

".")

if (s2 == "/" || s2 == "*" || s2 == "+" || s2 == "-" || s2

== ".") return true;

}

return false;

}

public string XuLyChuoi(string str)

{

string u, v, k;

k = XuLyChuoiCoSinCosTan(str);

u = XuLyNgoac(k, k.Length);

v = chinhLaiDau(u);

return v;

}

public double giaiHePhuongTrinhBacNhat2An(double a1, double b1, double c1, double a2, double b2, double c2)

{

double d, d1, d2;

d = a1 * b2 - a2 * b1;

d1 = c1 * b2 - c2 * b1;

d2 = a1 * c2 - a2 * c1;

if ((d == 0) && (d1 == 0) && (d2 == 0)) return 1;

if ((d == 0) && (d1 != 0) && (d2 == 0)) return 0;

if ((d == 0) && (d1 == 0) && (d2 != 0)) return 0;

if (d != 0)

{

x = d1 / d;

y = d2 / d;

}

return 2;

}

public double giaiHePhuongTrinhBacNhat3An(double a1, double b1, double c1, double d1, double a2, double b2, double c2, double d2, double a3, double b3, double c3, double d3)

{

double d, dx, dy, dz;

d = a1 * b2 * c3 - a1 * c2 * b3 + b1 * a2 * c3 - b1 * c2 * a3 + c1

* a2 * b3 - c1 * a3 * b2;

dx = d1 * b2 * c3 - d1 * c2 * b3 + b1 * d2 * c3 - b1 * c2 * d3 + c1 * d2 * b3 - c1 * d3 * b2;

dy = a1 * d2 * c3 - a1 * c2 * d3 + d1 * a2 * c3 - d1 * c2 * a3 + c1 * a2 * d3 - c1 * a3 * d2;

dz = a1 * b2 * d3 - a1 * d2 * b3 + b1 * a2 * d3 - b1 * d2 * a3 + d1 * a2 * b3 - d1 * a3 * b2;

if (d == 0 && dx == 0 && dy == 0 && dz == 0) return 0;

if (d == 0)

if (dx != 0 || dy != 0 || dz != 0) return 1;

if (d != 0)

{

x = dx / d;

y = dy / d;

z = dz / d;

}

return 2;

}

public double giaiPhuongTrinhBacHai(double a, double b, double c) {

double denta;

denta = b * b - 4 * a * c;

if (denta == 0)

{

x1 = -b / (2 * a);

return 1;

}

if (denta < 0)

return 0;

if (denta > 0)

{

x1 = -b + Math.Sqrt(denta) / (2 * a);

x2 = -b - Math.Sqrt(denta) / (2 * a);

}

return 2;

}

private void bt_0_Click(object sender, EventArgs e)

{

txt_pheptinh.Text = txt_pheptinh.Text + "0";

clickBang = false;

}

private void bt_1_Click(object sender, EventArgs e)

{

txt_pheptinh.Text = txt_pheptinh.Text + "1";

clickBang = false;

}

private void bt_2_Click(object sender, EventArgs e)

{

txt_pheptinh.Text = txt_pheptinh.Text + "2";

clickBang = false;

}

private void bt_3_Click(object sender, EventArgs e)

{

txt_pheptinh.Text = txt_pheptinh.Text + "3";

clickBang = false;

}

private void bt_4_Click(object sender, EventArgs e) {

txt_pheptinh.Text = txt_pheptinh.Text + "4";

clickBang = false;

}

private void bt_5_Click(object sender, EventArgs e) {

txt_pheptinh.Text = txt_pheptinh.Text + "5";

clickBang = false;

}

private void bt_6_Click(object sender, EventArgs e) {

txt_pheptinh.Text = txt_pheptinh.Text + "6";

clickBang = false;

}

private void bt_7_Click(object sender, EventArgs e) {

txt_pheptinh.Text = txt_pheptinh.Text + "7";

clickBang = false;

}

private void bt_8_Click(object sender, EventArgs e) {

txt_pheptinh.Text = txt_pheptinh.Text + "8";

clickBang = false;

}

private void bt_9_Click(object sender, EventArgs e) {

txt_pheptinh.Text = txt_pheptinh.Text + "9";

clickBang = false;

}

private void bt_cong_Click(object sender, EventArgs e) {

if (clickBang == true)

{

txt_pheptinh.Text = ketQua;

clickBang = false;

}

txt_pheptinh.Text += "+";

}

private void bt_nhan_Click(object sender, EventArgs e) {

if (clickBang == true)

{

txt_pheptinh.Text = ketQua;

clickBang = false;