C # calculator (WinForm ),

C # calculator (WinForm ),

1. Open Microsoft Visual Studio 2013 and create a project named [Calculator.

2. Place appropriate controls on the Form1 form for layout (PS: Good naming rules are recommended ).

3. Form1 code is written as follows:

1 public partial class frmMain: Form 2 {3 private string number; 4 public frmMain () 5 {6 InitializeComponent (); 7} 8 // <summary> 9 // enter 1 ~ 9, + ,-,*,/,(,) assign the variable number and the text box txtDisplay10 /// </summary> 11 /// <param name = "sender"> </param> 12 /// <param name =" e "> </param> 13 private void InputHandler (object sender, eventArgs e) 14 {15 number + = (Button) sender ). text; 16 this.txt Display. text + = (Button) sender ). text; 17} 18 /// <summary> 19 /// = 20 /// </summary> 21 /// <param name = "sender"> </param> 22/ // <param name = "e"> </param> 23 private void btnQu Al_Click (object sender, EventArgs e) 24 {25 // if the txtDisplay Text box is not empty, calculate 26 if (txtDisplay. Text! = String. empty) 27 {28 number = this.txt Display. text; 29 this.txt Display. text + = "="; 30 this.txt Display. text + = Calculator. dealWith (number ). toString (); 31} 32} 33 // <summary> 34 // CE35 // </summary> 36 // <param name = "sender"> </param> 37 /// <param name = "e"> </param> 38 private void btClear_Click (object sender, eventArgs e) 39 {40 number = string. empty; 41 txtDisplay. text = string. empty; 42} 43 // <sum Mary> 44 // enter 45 characters in txtDisplay /// </summary> 46 /// <param name = "sender"> </param> 47 // <param name = "e"> </param> 48 private void txtDisplay_KeyPress (object sender, keyPressEventArgs e) 49 {50 // if the input is not a numeric category, nor is it a enter key, Backspace key, +-*/(), txtDisplay_KeyPress cancels the input 51 if (! (Char. IsNumber (e. KeyChar) & e. KeyChar! = (Char) 13 & e. KeyChar! = (Char) 8 & e. KeyChar! = (Char) 40 & e. KeyChar! = (Char) 41 & e. KeyChar! = (Char) 42 & e. KeyChar! = (Char) 43 & e. KeyChar! = (Char) 45 & e. KeyChar! = (Char) 47) 52 {53 e. Handled = true; 54} 55} 56}

4. We noticed that there is a method Calculator. dealWith () in the btnQual_Click event. Similarly, we write the Calculator Code as follows:

1 public static class Calculator 2 {3 public static float dealWith (string number) 4 {5 string operand1 = "", opreand2 = ""; 6 float result = 0; 7 char opera = '', operandOrOera =''; 8 string [,] opreandArray = new string [50, 2]; 9 Queue numberQueue = new Queue (); 10 11 // All characters in the loop string are assigned to the numberQueue queue 12 foreach (char c in number) 13 {14 15 numberQueue. enqueue (c); 16} 17 18 // split the characters in the queue to form a number with "+" or "- And put them into the two-dimensional array opreandArray 19 while (numberQueue. Count! = 0) 20 {21 operandOrOera = Convert. toChar (numberQueue. peek (); 22 if (operandOrOera = '(') 23 {24 numberQueue. dequeue (); 25 string inside = null; 26 while (Convert. toChar (numberQueue. peek ())! = ') 27 {28 inside + = (numberQueue. dequeue ()). toString (); 29} 30 numberQueue. dequeue (); 31 operand1 = dealWith (inside ). toString (); 32} 33 while (Convert. toInt32 (operandOrOera)> 47 & Convert. toInt32 (operandOrOera) <58) // ASCII48-57 corresponds to 0-9 34 {35 numberQueue. dequeue (); 36 operand1 + = operandOrOera. toString (); 37 if (numberQueue. count! = 0) 38 {39 operandOrOera = Convert. toChar (numberQueue. peek (); 40} 41 else 42 {43 break; 44} 45} 46 int j = 0; 47 if (operandOrOera = '+' | operandOrOera = '-' | operandOrOera = '*' | operandOrOera = '/') 48 {49 numberQueue. dequeue (); 50 opera = operandOrOera; 51 // if it is "+" or "-" 52 if (opera = '+' | opera = '-') 53 {54 opreandArray [j, 0] = operand1; 55 opreandArray [j, 1] = opera. toSt Ring (); 56 j ++; 57 operand1 = null; 58} 59 // if it is "*" or "/" 60 else 61 {62 char n = Convert. toChar (numberQueue. peek (); 63 if (n = '(') 64 {65 66 numberQueue. dequeue (); 67 string inside = null; 68 while (Convert. toChar (numberQueue. peek ())! = ') 69 {70 inside + = (numberQueue. dequeue ()). toString (); 71} 72 numberQueue. dequeue (); 73 opreand2 = dealWith (inside ). toString (); 74} 75 while (Convert. toInt32 (n)> 47 & Convert. toInt32 (n) <58) 76 {77 opreand2 + = n. toString (); 78 numberQueue. dequeue (); 79 if (numberQueue. count! = 0) 80 {81 n = Convert. toChar (numberQueue. peek (); 82} 83 else 84 {85 break; 86} 87} 88 89 switch (opera) 90 {91 case ('*'): 92 {93 operand1 = (Convert. toInt32 (operand1) * Convert. toInt32 (opreand2 )). toString (); 94 break; 95} 96 case ('/'): 97 {98 try 99 {100 operand1 = (Convert. toInt32 (operand1)/Convert. toInt32 (opreand2 )). toString (); 101} 102 catch (Exception) {103 104} 105 break; 106} 10 7 108} 109 opreand2 = null; 110} 111} 112 113 114 // calculate the number in the two-dimensional array and assign the value result116 int count = 0; 117 for (int I = 0; opreandArray [I, 0]! = Null; I ++) 118 {119 count ++; 120} 121 for (int I = 0; I <count; I ++) 122 {123 if (I = 0) 124 {125 result + = Convert. toInt32 (opreandArray [I, 0]); 126 127} 128 else129 {130 if (opreandArray [I-1, 1] = "+ ") 131 {132 result + = Convert. toInt32 (opreandArray [I, 0]); 133} 134 else135 {136 result-= Convert. toInt32 (opreandArray [I, 0]); 137} 138} 139 140 141 142 143 // add or remove 144 if (count! = 0) 145 {146 if (opreandArray [count-1, 1] = "+") 147 {148 return result + Convert. toInt32 (operand1); 149} 150 else151 {152 return result-Convert. toInt32 (operand1); 153} 154} 155 else156 {157 return Convert. toInt32 (operand1); 158} 159} 160}

5. O (∩ _ ∩) O Haha ~, The basic code is written.