Lektion 13: lösningsförslag

1. // 1
2. class Product
3. {
4. public string Name { get; set; }
5. public double Price { get; set; }
6. }
8. static void Main(string[] args)
9. {
10. List<Product> cart = new List<Product>();
11. string[] lines = File.ReadAllLines("Products.txt");
13. foreach (string line in lines)
14. {
15. try
16. {
17. string[] parts = line.Split(',');
18. string name = parts[0];
19. double price = double.Parse(parts[1]);
20. Product product = new Product
21. {
22. Name = name,
23. Price = price
24. };
25. cart.Add(product);
26. }
27. catch
28. {
29. Console.WriteLine("Invalid line in product file");
30. }
31. }
33. double total = 0;
34. foreach (Product p in cart)
35. {
36. total += p.Price;
37. }
39. if (total < 300)
40. {
41. total += 29;
42. }
44. Console.WriteLine("Total: " + total);
45. }
47. // 2
48. class Product
49. {
50. public string Name { get; set; }
51. public double Price { get; set; }
52. }
54. static void Main(string[] args)
55. {
56. List<Product> cart = new List<Product>();
57. string[] lines = File.ReadAllLines("Products.txt");
59. foreach (string line in lines)
60. {
61. try
62. {
63. string[] parts = line.Split(',');
64. string name = parts[0];
65. double price = double.Parse(parts[1]);
66. Product product = new Product
67. {
68. Name = name,
69. Price = price
70. };
71. cart.Add(product);
72. }
73. catch
74. {
75. Console.WriteLine("Invalid line in product file");
76. }
77. }
79. double total = 0;
80. foreach (Product p in cart)
81. {
82. total += p.Price;
83. }
85. if (total < 300)
86. {
87. total += 29;
88. }
90. // We could reduce some duplication here by using custom methods and/or a do-while loop.
91. string[] validCodes = File.ReadAllLines("Codes.txt");
92. Console.Write("Please enter code: ");
93. string userCode = Console.ReadLine();
94. bool codeFound = false;
95. while (userCode != "" && !codeFound)
96. {
97. foreach (string code in validCodes)
98. {
99. if (code == userCode)
100. {
101. codeFound = true;
102. }
103. }
105. if (!codeFound)
106. {
107. Console.WriteLine("Invalid code entered.");
108. Console.Write("Please enter code: ");
109. userCode = Console.ReadLine();
110. }
111. }
113. if (codeFound)
114. {
115. total = total * 0.8;
116. }
118. Console.WriteLine("Total: " + total);
119. }
121. // 3
122. class Product
123. {
124. public string Name { get; set; }
125. public double Price { get; set; }
126. }
128. static void Main(string[] args)
129. {
130. List<Product> products = new List<Product>();
131. string[] lines = File.ReadAllLines("Products.txt");
133. foreach (string line in lines)
134. {
135. try
136. {
137. string[] parts = line.Split(',');
138. string name = parts[0];
139. double price = double.Parse(parts[1]);
140. Product product = new Product
141. {
142. Name = name,
143. Price = price
144. };
145. products.Add(product);
146. }
147. catch
148. {
149. Console.WriteLine("Invalid line in product file");
150. }
151. }
153. // As before, We could reduce some duplication here by using custom methods and/or a do-while loop.
154. List<Product> cart = new List<Product>();
155. Console.Write("Please enter product name: ");
156. string productName = Console.ReadLine();
157. while (productName != "")
158. {
159. bool productFound = false;
160. foreach (Product p in products)
161. {
162. if (p.Name == productName)
163. {
164. productFound = true;
165. cart.Add(p);
166. }
167. }
169. if (!productFound)
170. {
171. Console.WriteLine("Product " + productName + " does not exist.");
172. }
174. Console.Write("Please enter product name: ");
175. productName = Console.ReadLine();
176. }
178. double total = 0;
179. foreach (Product p in cart)
180. {
181. total += p.Price;
182. }
184. if (total < 300)
185. {
186. total += 29;
187. }
189. string[] validCodes = File.ReadAllLines("Codes.txt");
190. Console.Write("Please enter code: ");
191. string userCode = Console.ReadLine();
192. bool codeFound = false;
194. while (userCode != "" && !codeFound)
195. {
196. foreach (string code in validCodes)
197. {
198. if (code == userCode)
199. {
200. codeFound = true;
201. }
202. }
204. if (!codeFound)
205. {
206. Console.WriteLine("Invalid code entered.");
207. Console.Write("Please enter code: ");
208. userCode = Console.ReadLine();
209. }
210. }
212. if (codeFound)
213. {
214. total = total * 0.8;
215. }
217. Console.WriteLine("Total: " + total);
218. }