第八周任务（二）
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[cpp] view plaincopy01./* (程序头部注释开始) 02.* 程序的版权和版本声明部分 03.* Copyright (c) 2011, 烟台大学计算机学院学生 04.* All rights reserved. 05.* 文件名称：renwu.cpp 06.* 作 者：苗向前 07.* 完成日期：2012 年 4 月 11 日 08.* 版 本 号：8.2 09.* 对任务及求解方法的描述部分 10.* 输入描述：略 11.* 问题描述：略 12.* 程序输出：略 13.* 程序头部的注释结束 14.*/ 15.#include <iostream> 16.using namespace std; 17. 18.class CTime 19. { 20. private: 21. unsigned short int hour; // 时 22. unsigned short int minute; // 分 23. unsigned short int second; // 秒 24. public: 25. CTime(int h=0,int m=0,int s=0); 26. void setTime(int h,int m,int s); 27. void display(); 28. //比较运算符(二目)的重载 29. bool operator > (CTime &t); 30. bool operator < (CTime &t); 31. bool operator >= (CTime &t); 32. bool operator <= (CTime &t); 33. bool operator == (CTime &t); 34. bool operator != (CTime &t); 35. //二目运算符的重载 36. CTime operator+(CTime &c); //返回c所规定的时、分、秒后的时间，例t1(8,20,25),t2(11,20,50)，t1+t2为:41:15 37. CTime operator-(CTime &c);//对照+理解 38. CTime operator+(int s);//返回s秒后的时间 39. CTime operator-(int s);//返回s秒前的时间 40. //一目运算符的重载 41. CTime operator++(int);//后置++，下一秒 42. CTime operator++();//前置++，下一秒 43. CTime operator--(int);//后置--，前一秒 44. CTime operator--();//前置--，前一秒 45. //赋值运算符的重载 46. CTime operator+=(CTime &c); 47. CTime operator-=(CTime &c); 48. CTime operator+=(int s);//返回s秒后的时间 49. CTime operator-=(int s);//返回s秒前的时间 50. }; 51. 52.CTime::CTime(int h,int m,int s) 53. { 54. hour=h; 55. minute=m; 56. second=s; 57. } 58. 59.void CTime::setTime(int h,int m,int s) 60. { 61. hour=h; 62. minute=m; 63. second=s; 64. } 65. 66.void CTime::display() 67. { 68. cout<<hour<<":"<<minute<<":"<<second<<endl; 69. } 70.//下面实现所有的运算符重载代码。 71.//为简化编程，请注意通过调用已有函数，利用好各函数之间的关系 72.bool CTime::operator > (CTime &t) 73. { 74. if(hour>t.hour) 75. return true; 76. else if(hour<t.hour) 77. return false; 78. else if(minute>t.minute) 79. return true; 80. else if(minute<t.minute) 81. return false; 82. else if(second>t.second) 83. return true; 84. else if(second<t.second) 85. return false; 86. else 87. return false; 88. } 89. 90.bool CTime::operator < (CTime &t) 91. { 92. if(hour<t.hour) 93. return true; 94. else if(hour>t.hour) 95. return false; 96. else if(minute<t.minute) 97. return true; 98. else if(minute>t.minute) 99. return false; 100. else if(second<t.second) 101. return true; 102. else if(second>t.second) 103. return false; 104. else 105. return false; 106. } 107. 108.bool CTime::operator >= (CTime &t) 109. { 110. CTime t1; 111. t1.hour=hour; 112. t1.minute=minute; 113. t1.second=second; 114. if (t1<t) 115. return false; 116. return true; 117. } 118. 119.bool CTime::operator <= (CTime &t) 120. { 121. CTime t1; 122. t1.hour =hour; 123. t1.minute =minute ; 124. t1.second =second ; 125. if (t1>t) 126. return false; 127. return true; 128. } 129. 130.bool CTime::operator == (CTime &t) 131. { 132. CTime t1; 133. t1.hour=hour; 134. t1.minute=minute; 135. t1.second=second; 136. if (t1>t||t1<t) 137. return false; 138. else 139. return true; 140. } 141. 142.bool CTime::operator != (CTime &t) 143. { 144. CTime t1; 145. t1.hour=hour; 146. t1.minute=minute; 147. t1.second=second; 148. if(t1==t) 149. return false; 150. else 151. return true; 152. } 153. 154.CTime CTime::operator+(CTime &c) 155. { 156. CTime t; 157. t.hour=hour+c.hour; 158. t.minute=minute+c.minute; 159. t.second=second+c.second; 160. if (t.second>59) 161. { 162. t.minute=(t.minute+t.second/60); 163. if (t.minute>59) 164. { 165. t.hour=(t.hour+t.minute/60); 166. if (t.hour>23) 167. t.hour=(t.hour%24); 168. t.minute=(t.minute%60); 169. } 170. t.second=(t.second%60); 171. } 172. if (t.minute>59) 173. { 174. t.hour=(t.hour+t.minute/60); 175. if (t.hour>23) 176. t.hour=(t.hour%24); 177. t.minute=(t.minute%60); 178. } 179. if (t.hour>23) 180. t.hour=(t.hour%24); 181. return t; 182. } 183. 184.CTime CTime::operator-(CTime &c) 185. { 186. CTime t; 187. unsigned short int k,h; 188. t.hour=hour; 189. t.minute=minute; 190. t.second=second; 191. if(second<c.second) 192. { 193. k=(-(second-c.second))%60; 194. h=(-(second-c.second))/60; 195. t.second=(60-k); 196. t.minute=(minute-h-1); 197. if(t.minute<0) 198. { 199. t.minute=(-t.minute); 200. k=t.minute%60; 201. h=t.minute/60; 202. t.hour=t.hour-h-1; 203. t.minute=(60-k); 204. if(t.hour<0) 205. { 206. t.hour=(-t.hour); 207. t.hour=(t.hour%24); 208. } 209. } 210. } 211. else 212. { 213. t.second =second-c.second ; 214. } 215. if(t.minute<c.minute ) 216. { 217. h=(-(t.minute -c.minute ))%60; 218. k=(-(t.minute -c.minute ))/60; 219. t.minute =(60-k); 220. t.hour=(t.hour-1-h); 221. if(t.hour<0) 222. { 223. t.hour =(-t.hour ); 224. t.hour =(t.hour %24); 225. } 226. } 227. else 228. { 229. t.minute =(t.minute-c.minute ); 230. } 231. if(t.hour<c.hour ) 232. { 233. t.hour =(-(t.hour -c.hour ))%24; 234. } 235. else 236. { 237. t.hour=(t.hour -c.hour ); 238. } 239. return t; 240. } 241. 242.CTime CTime::operator+(int s) 243. { 244. CTime t; 245. t.hour =hour; 246. t.minute =minute ; 247. t.second =second ; 248. t.second =(t.second +s); 249. if (t.second >59) 250. { 251. t.minute+=t.second/60; 252. if (t.minute>59) 253. { 254. t.hour+=t.minute/60; 255. if (t.hour>23) 256. t.hour%=24; 257. t.minute%=60; 258. } 259. t.second%=60; 260. } 261. else if (t.minute>59) 262. { 263. t.hour+=t.minute/60; 264. if (t.hour>23) 265. t.hour%=24; 266. t.minute%=60; 267. } 268. else if (t.hour>23) 269. t.hour%=24; 270. return t; 271. } 272. 273.CTime CTime::operator-(int s) 274. { 275. CTime t; 276. unsigned short int k,h; 277. t.hour =hour; 278. t.minute =minute ; 279. t.second =second ; 280. if(t.second <s) 281. { 282. k=(-(second-s) )%60; 283. h=(-(second-s ))/60; 284. t.second =(60-k); 285. t.minute =(minute-h-1); 286. if(t.minute<0) 287. { 288. t.minute =(-t.minute ); 289. k=t.minute %60; 290. h=t.minute /60; 291. t.hour=t.hour-h-1; 292. t.minute =(60-k); 293. if(t.hour<0) 294. { 295. t.hour =(-t.hour ); 296. t.hour =(t.hour %24); 297. } 298. } 299. } 300. else 301. { 302. t.second =second-s; 303. } 304. return t; 305. } 306. 307.CTime CTime::operator++(int) 308. { 309. CTime temp(*this); 310. second++; 311. if(second>=60) 312. { 313. second-=60; 314. ++minute; 315. } 316. return temp; 317. } 318. 319.CTime CTime::operator++() 320. { 321. if(++second>=60) 322. { 323. second-=60; 324. ++minute; 325. } 326. return *this; 327. } 328. 329.CTime CTime::operator--(int) 330. { 331. CTime temp(*this); 332. second--; 333. if(second<0) 334. { 335. second=59; 336. --minute; 337. } 338. return temp; 339. } 340.CTime CTime::operator--() 341. { 342. if(--second<0) 343. { 344. second=59; 345. --minute; 346. } 347. return *this; 348. } 349. 350.CTime CTime::operator+=(CTime &c) 351. { 352. CTime t1,t; 353. t1.hour =hour; 354. t1.minute =minute; 355. t1.second =second; 356. t=t1+c; 357. hour=t.hour; 358. minute=t.minute; 359. second=t.second; 360. return t; 361. } 362. 363.CTime CTime::operator-=(CTime &c) 364. { 365. CTime t1,t; 366. t1.hour=hour; 367. t1.minute=minute; 368. t1.second=second; 369. t=t1-c; 370. hour=t.hour; 371. minute=t.minute; 372. second=t.second; 373. return t; 374. } 375. 376.CTime CTime::operator+=(int s) 377. { 378. CTime t1,t; 379. t1.hour=hour; 380. t1.minute=minute; 381. t1.second=second; 382. t=t1+s; 383. hour=t.hour; 384. minute=t.minute; 385. second=t.second; 386. return t; 387. } 388. 389.CTime CTime::operator-=(int s) 390. { 391. CTime t1,t; 392. t1.hour=hour; 393. t1.minute=minute; 394. t1.second=second; 395. t=t1-s; 396. hour=t.hour; 397. minute=t.minute; 398. second=t.second; 399. return t; 400. } 401. 402.int main() 403. { 404. CTime t1(8,20,25),t2(11,20,50),t; 405. int n; 406. cout<<"t1为："; 407. t1.display(); 408. cout<<"t2为："; 409. t2.display(); 410. cout<<"下面比较两个时间大小：\n"; 411. if (t1>t2) cout<<"t1>t2"<<endl; 412. if (t1<t2) cout<<"t1<t2"<<endl; 413. if (t1==t2) cout<<"t1＝t2"<<endl; 414. if (t1!=t2) cout<<"t1≠t2"<<endl; 415. if (t1>=t2) cout<<"t1≥t2"<<endl; 416. if (t1<=t2) cout<<"t1≤t2"<<endl; 417. cout<<endl; 418. cout<<"t1+t2的时间为："; 419. t=t1+t2; 420. t.display(); 421. cout<<"t1-t2的时间为："; 422. t=t1-t2; 423. t.display(); 424. cout<<endl; 425. t = t1 + t2; 426. cout << "t1+t2 = "; 427. t.display(); 428. t = t1++; 429. cout << "t1++ = "; 430. t.display(); 431. t = ++t1; 432. cout << "++t1 = "; 433. t.display(); 434. t = t1--; 435. cout << "t1-- = "; 436. t.display(); 437. t = --t1; 438. cout << "--t1 = "; 439. t.display(); 440. cout<<endl; 441. system("pause"); 442. return 0; 443. }
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