Calculator application

Question

Hi all,

I am developing calculator app using C#.I have successfuly implemented its standard arithmetic functions but a bit trapped in implementing scientific functions such as sin,cos.tan etc.
I take an operand1,then operator and finally second opernad to workout arithmetic calculations.In the very first attempt to do scientific calculation i for the sake of programme format first takes input followed by sin/cos/tan etc and then out result.

Here is my code:

 

 

1. using System;
2. using System.Collections.Generic;
3. using System.ComponentModel;
4. using System.Data;
5. using System.Drawing;
6. using System.Linq;
7. using System.Text;
8. using System.Windows.Forms;
10. namespace Calculator
11. {
12. public partial class Form1 : Form
13. {
15. string input = string.Empty;
16. string operand1 = string.Empty;
17. string operand2 = string.Empty;
18. char operaton;
19. double result = 0.0;
22. public Form1()
23. {
24. InitializeComponent();
25. }
27. private void one_Click(object sender, EventArgs e)
28. {
29. this.textBox1.Text = " ";
30. input += "1";
31. this.textBox1.Text += input;
32. }
34. private void two_Click(object sender, EventArgs e)
35. {
36. this.textBox1.Text = " ";
37. input += "2";
38. this.textBox1.Text += input;
39. }
41. private void three_Click(object sender, EventArgs e)
42. {
43. this.textBox1.Text = " ";
44. input += "3";
45. this.textBox1.Text += input;
46. }
48. private void four_Click(object sender, EventArgs e)
49. {
50. this.textBox1.Text = " ";
51. input += "4";
52. this.textBox1.Text += input;
53. }
55. private void five_Click(object sender, EventArgs e)
56. {
57. this.textBox1.Text = " ";
58. input += "5";
59. this.textBox1.Text += input;
61. }
63. private void six_Click(object sender, EventArgs e)
64. {
65. this.textBox1.Text = " ";
66. input += "6";
67. this.textBox1.Text += input;
68. }
70. private void seven_Click(object sender, EventArgs e)
71. {
72. this.textBox1.Text = " ";
73. input += "7";
74. this.textBox1.Text += input;
75. }
77. private void eight_Click(object sender, EventArgs e)
78. {
79. this.textBox1.Text = " ";
80. input += "8";
81. this.textBox1.Text += input;
82. }
84. private void nine_Click(object sender, EventArgs e)
85. {
86. this.textBox1.Text = " ";
87. input += "9";
88. this.textBox1.Text += input;
89. }
91. private void dot_Click(object sender, EventArgs e)
92. {
93. this.textBox1.Text = " ";
94. input += ".";
95. this.textBox1.Text += input;
96. }
98. private void zero_Click(object sender, EventArgs e)
99. {
100. this.textBox1.Text = " ";
101. input += "0";
102. this.textBox1.Text += input;
103. }
105. private void clear_Click(object sender, EventArgs e)
106. {
107. this.textBox1.Text = "0";
108. this.input = string.Empty;
109. this.operand1 = string.Empty;
110. this.operand2 = string.Empty;
113. }
115. private void plus_Click(object sender, EventArgs e)
116. {
117. operand1 = input;
118. operaton = '+';
119. input = string.Empty;
120. }
122. private void minus_Click(object sender, EventArgs e)
123. {
124. operand1 = input;
125. operaton = '-';
126. input = string.Empty;
127. }
129. private void mul_Click(object sender, EventArgs e)
130. {
131. operand1 = input;
132. operaton = '*';
133. input = string.Empty;
134. }
136. private void div_Click(object sender, EventArgs e)
137. {
138. operand1 = input;
139. operaton = '/';
140. input = string.Empty;
141. }
142. private void mod_Click(object sender, EventArgs e)
143. {
144. operand1 = input;
145. operaton = '%';
146. input = string.Empty;
147. }
149. private void sine_Click(object sender, EventArgs e)
150. {
151. operand1 = input;
152. operaton = 's';
153. input = string.Empty;
154. }
156. private void cosine_Click(object sender, EventArgs e)
157. {
158. operand1 = input;
159. operaton = 'c';
160. input = string.Empty;
161. }
163. private void tan_Click(object sender, EventArgs e)
164. {
165. operand1 = input;
166. operaton = 't';
167. input = string.Empty;
168. }
172. private void equals_Click(object sender, EventArgs e)
173. {
174. operand2 = input;
175. double num1, num2;
176. double.TryParse(operand1, out num1);
177. double.TryParse(operand2, out num2);
179. if (operaton == '+')
180. {
181. result = num1 + num2;
182. textBox1.Text = result.ToString();
183. }
184. else if (operaton == '-')
185. {
186. result = num1 - num2;
187. textBox1.Text = result.ToString();
188. }
189. else if (operaton == '*')
190. {
191. result = num1 * num2;
192. textBox1.Text = result.ToString();
193. }
194. else if (operaton == '/')
195. {
196. if (num2 != 0)
197. {
198. result = num1 / num2;
199. textBox1.Text = result.ToString();
200. }
201. else
202. {
203. textBox1.Text = "DIV/Zero!";
204. }
205. }
207. else if (operaton == '%')
208. {
210. result = num1 % num2;
211. textBox1.Text = result.ToString();
214. }
215. else if (operaton == 's')
216. {
217. int inp;
218. int.TryParse(operand1, out inp);
219. result = Math.Sin(inp);
220. textBox1.Text = result.ToString();
222. }
223. else if (operaton == 'c')
224. {
225. int inp;
226. int.TryParse(operand1, out inp);
227. result = Math.Cos(num1);
228. textBox1.Text = result.ToString();
230. }
231. else if (operaton == 't')
232. {
233. int inp;
234. int.TryParse(operand1, out inp);
235. result = Math.Tan(num1);
236. textBox1.Text = result.ToString();
238. }
249. }
253. }
266. }

 

 

 

I want to mention here that my output for scientific functions is not correct.Also,kindly tell me error in this format as in second attempt i will convert it to standard scientific mode i.e. pressing sin/cos/tan and then operand.

Regards