Simple Calculator C # learning

C # source code

Https://git.oschina.net/363451039/Jisuanqi

Implement subtraction Square open reciprocal keyboard input
History Query and delete


Memory Plus/minus function not implemented

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 windowsformsapplication3{public partial class Mainform:form {public MainForm () {Initia        Lizecomponent (); }/////To store the most recently entered digital e_num and recent operations E_op///button CE save E_num, while Button C empties E_num and E_op Doub        Le e_num = 0;        Double e_res=0;        String e_op= "";        */String Op= "";//operator Double num1=0;        Double num2=0;        Double res=0;  int iOp = 0;//operator position bool Newop = true;                Start the new operation bool Addop = FALSE;                Type the number private void Button_click_num (object sender, EventArgs e) {if (NEWOP) {                Textnumbox.text = "";                Newop = false;                Addop = false;               /* E_num = num2;                E_res=res;                E_op=op;            */}///* Gets the button value assigned to Textnumbox.ttext///Multiple button's Click event named Button_click_num            Implement batch Button_click_num operation Button tempnum = (button) sender;            Textnumbox.text + = tempNum.Text.ToString (); */} private void Button_click_op (object sender, EventArgs e) {button TempO            p = (Button) sender;        Operater (TempOp.Text.ToString ()); private void Operater (string oper) {if (ADDOP) {textnumbox.text = C Onvert.                ToString (res) + oper;            Newop = false;            } else {textnumbox.text + = oper;            } Op=oper;            E_op=tempop.text.tostring ();            E_num1=textnumbox.text.substring (0, textnumbox.text.length-1); E_num2=textnumbox.text.skipwhIle<char> (char i,result<char,i== ' + ' | | i== '-' | | i== ' x ' | |            i== ' ÷ ' >predicate);//does not use this function} private void Operater (char oper) {if (ADDOP)            {Newop = false;            } op = convert.tostring (oper);            E_op=tempop.text.tostring ();            E_num1=textnumbox.text.substring (0, textnumbox.text.length-1); E_num2=textnumbox.text.skipwhile<char> (char i,result<char,i== ' + ' | | i== '-' | | i== ' x ' | |            i== ' ÷ ' >predicate);//does not use this function} private void Button_click_del (object sender, EventArgs e) { if (TextNumBox.Text.Length > 0) {textnumbox.text = textNumBox.Text.Substring (0, Textnumbo                X.TEXT.LENGTH-1);            Newop = false;            }} private void Button_click_ce (object sender, EventArgs e) {textnumbox.text = "";        Newop = true; } private void Button_click_c (object sender, EVentargs e) {textnumbox.text = "";            /* E_num = 0;            E_op = "";                */} private void Button_click_result (object sender, EventArgs e) {try {                    if (NEWOP) do not judge in result whether it is a restart calculation, but update textnumbox.text//{result ();                    res = Operate (OP);                    Newop = true;                    Addop = true;                COMMON.HISTORYLIST.ADD (Textnumbox.text);                }//else//{//result (RES);                 res = Operate (OP);                }} catch (Exception exc) {textnumbox.text= "Error";                Newop = false;            Addop = true;            }} private void result () {iOp = TextNumBox.Text.IndexOf (OP); NUM1 = convert.todouble (textNumBox.Text.SuBstring (0, iOp)); num2 = convert.todouble (textNumBox.Text.Substring (iOp + 1, textnumbox.text.length-iop-1));//-iop, The second parameter is the number of substring after the start of the//private void result (double oldnum)//{//IOP=TEXTNU        MBox.Text.LastIndexOf (OP);        NUM1 = Oldnum;        num2 = convert.todouble (textNumBox.Text.Substring (iOp + 1, textnumbox.text.length-iop-1));            } private double Operate (string opp) {double ress;                if (op = = "+") {ress = Num1 + num2;            Textnumbox.text + = "=" + ress;                } else if (op = = "-") {ress = num1-num2;            Textnumbox.text + = "=" + ress;                } else if (op = = "X") {ress = Num1 * NUM2;            Textnumbox.text + = "=" + ress; } else if (op = = "÷") {ress = num1/num2;            Textnumbox.text + = "=" + ress;            } else {ress = 0;        } return ress;            private void Button_click_fushu (object sender, EventArgs e) {textnumbox.text + = "-";            Newop = false;        COMMON.HISTORYLIST.ADD (Textnumbox.text);            } private void Button_click_pingfanggen (object sender, EventArgs e) {double numtemp;            try {numtemp = convert.todouble (Textnumbox.text);            } catch (System.FormatException)//cannot be converted to double under an exception with the res result calculated with {numtemp = res;            } res = math.sqrt (numtemp);            Textnumbox.text = "√ (" + numtemp + ") =" + res;            Newop = true;        COMMON.HISTORYLIST.ADD (Textnumbox.text);            } private void Button_click_daoshu (object sender, EventArgs e) {double numtemp;    Try        {numtemp = convert.todouble (Textnumbox.text);            } catch (System.FormatException)//cannot be converted to double under an exception with the res result calculated with {numtemp = res;            } res = 1/numtemp;            Textnumbox.text = "1/(" + numtemp + ") =" + convert.tostring (res);            Newop = true;        COMMON.HISTORYLIST.ADD (Textnumbox.text);   } private void Click_about (object sender, EventArgs e) {About aboutbox = new about (); To open a new window, first AboutBox.        ShowDialog ();   } private void Click_history (object sender, EventArgs e) {History historybox = new History (); To open a new window, first Historybox.        ShowDialog (); private void Click_pastenow (object sender, EventArgs e) {textnumbox.text + = Clipboard.gettext (        ); } private void Click_copynow (object sender, EventArgs e) {Clipboard.settext (textnumbox.teXT);        } bool flag = TRUE;            private void Keypress_equekey (object sender, KeyPressEventArgs e) {switch (E.keychar)                            {case ' = ': {if (flag) {                            Flag = false;                                 try {//if (NEWOP) do not judge in result whether it is a restart calculation, but rather update the Textnumbox.text                                    {//textnumbox.text + = "=";                                    Result (); if (TextNumBox.Text.Length > 0)//{//Textn                                    Umbox.text = textNumBox.Text.Substring (0, textnumbox.text.length-2);                                    Newop = false; } iOp = TextNumBox.Text.IndexOf (OP);                                    int op0 = textnumbox.text[0];//(0);                                    int OP1 = textnumbox.text[1];                                    NUM1 = convert.todouble (textNumBox.Text.Substring (0, iOp));                                    String temp = textNumBox.Text.Substring (iOp + 1, textnumbox.text.length-iop-1); num2 = convert.todouble (textNumBox.Text.Substring (iOp + 1, textnumbox.text.length-iop-1));//-iop,                                    The second parameter is the number of res = Operate (OP) after the start of the substring.                                    Newop = true;                                    Addop = true;                                COMMON.HISTORYLIST.ADD (Textnumbox.text); }//else//{//Result (res                                );                                 res = Operate (OP);           //}                 } catch (Exception exc) {                                Textnumbox.text = "Error";                                Newop = false;                            Addop = true;                            }} else {flag = true;                        TextNumBox.Text.Substring (1, textnumbox.text.length-1);                    } break;                        } case ' + ': {operater (' + ');                    Break                        } Case '-': {operater ('-');                    Break                        } case ' * ': {operater (' x ');                    Break               } case '/':     {operater (' ÷ ');                    Break  }}}}//History pass public class Common {public static list<string> historylist =        New List<string> ();    public static int a = 0; }}

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 windowsformsapplication3{public partial class History:form {public history () {Initiali        Zecomponent (); } private void Button_click_copy (object sender, EventArgs e) {Clipboard.settext (listbox1.items[l Istbox1.selectedindex].        ToString ());            } private void Button_click_delete (object sender, EventArgs e) {//listbox1.clearselected (); ListBox1.Items.Clear ();            Clear all int sel = Listbox1.selectedindex;        ListBox1.Items.RemoveAt (SEL); private void History_load (object sender, EventArgs e) {foreach (String A in common.historylist            ) {LISTBOX1.ITEMS.ADD (a); }        }    }}

Simple Calculator C # learning