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1. #include
2. /*自定义函数说明*/
3. voidscreen();/*系统主界面*/
4. voidwhatisit();/*查询某年某月某日是星期几*/
5. voidleapyear();/*查询某年是否闰年*/
6. voidprintyearday();/*打印某年的全年日历*/
7. intIsLeapYear(int);/*判断某年是否为闰年*/
8. intwhatisita(int,int);/*计算今天是星期几*/
9. inteverymonth(int,int);/*查询每月最大天数*/
10. voidprintmonth(int,int);/*打印某年某月日历*/
11. voidprintmonthday();/*打印某年的某月最大天数*/
12. voidprintyearmonthday();/*查询某年某月日历*/
13. /*定义一个判断星期几的指针数组*/
14. char*week[] = {"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
15. intmain()
16. {
17. system("color 2F");/*设置背景颜色为浅绿色*/
18. printf("制作人ID：2013914215.\n\n");/*个人信息，姓名:庞世聪，学号：2013914215*/
19. screen();/*万年历的入口*/
20. getch();
21. }
23. /*万年历查询主界面（含部分功能）*/
24. voidscreen()
25. {
26. intn;
27. while(1)
28. {
29. /*万年历的功能*/
30. printf(" 万年历查询程序：\n");
31. printf("1:查询某年某月某日是星期几\n");
32. printf("2:查询某年是否是闰年");
33. printf("3:打印某年的全年日历");
34. printf("4:打印某年某月的日历");
35. printf("5:查询某年某月的最大天数");
36. printf("6:退出");
37. printf("请输入要查询的选项： ");
38. scanf("%d",&n);
39. switch(n)
40. {
41. /*实现相应功能的函数*/
42. case1:whatisit();break;
43. case2:leapyear();break;
44. case3:printyearday();break;
45. case4:printyearmonthday();break;
46. case5:printmonthday();break;
47. case6:return;
48. default:printf("你输入错误，请按要求输入！！！");break;
49. }/*end of switch (n)*/
51. }/*end of while (1)*/
52. }/*end of void screen ()*/
54. /*查询某年某月某日是星期几*/
55. voidwhatisit()
56. {
57. inty, m, d, s, k=1, sum, n, i;
58. charyn;
60. /*定义一个数组，计算每月的天数*/
61. inta[13] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
62. while(k)
63. {
64. printf("请依次输入年，月，日：");
65. scanf("%d,%d,%d",&y,&m,&d);/*输入要查询的年、月、日*/
66. s = 0;
68. for(i = 1; i < m; i++)
69. {
70. s = s + a[i];
71. }
73. s = s + d;
75. if(IsLeapYear(y) && m > 2)
76. {
77. s = s + 1;
78. }
80. sum = s;
81. n = (y-1 + (y-1)/4-(y-1)/100 + (y-1)/400 + sum) % 7;
82. printf("%d 年 %d 月 %d 号是： %s.\n",y,m,d,week[n]);
83. printf("是否要继续查询（Y/N）?");
84. scanf("%c",&yn);
85. getchar();
87. if(yn =='y'|| yn =='Y')
88. {
89. k = 1;
90. }
92. else
93. {
94. k = 0;
95. }/*end of if (yn == 'y' || yn == 'Y')*/
96. }/*end of while (k)*/
97. }/*end of void whatisit()*/
99. /*判断某年是否是闰年*/
100. intIsLeapYear(intyear)
101. {
102. return(year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);/*返回一个整型值0或1*/
103. }/*end of int IsLeapYear(int year)*/
105. /*查询某年是否是闰年*/
106. voidleapyear()
107. {
108. inty, k = 1;
109. charyn;
110. while(k)
111. {
112. printf("请输入要查询的年份： ");
113. scanf("%d",&y);
115. if(IsLeapYear(y))/*y是判断标志*/
116. {
117. printf("%d 年是闰年！",y);
118. }
120. else
121. {
122. printf("%d 年不是闰年！\n",y);
123. }
125. printf("是否继续查询（Y/N）？");
126. scanf("%c",&yn); getch();
128. if(yn =='y'|| yn =='Y')/*是否继续查询入口*/
129. {
130. k = 1;/*k是是否继续查询的标志*/
131. }
133. else
134. {
135. k = 0;
136. }/*end of if (yn == 'y' || yn == 'Y')*/
137. }/*end of while (k)*/
138. }/*end of void leapyear()*/
140. /*计算当天是星期几*/
141. intwhatisita(inty,intm)/*whatisita 是有参函数，返回值是整型，y表示年，m表示月*/
142. {
143. intn, i;
144. inta[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}, s = 0;
146. for(i = 1;i < m;i++)/*计算总天数*/
147. {
148. s = s + a[i];
149. }
151. if(IsLeapYear(y) && m > 2)/*判断是否闰年，如果是闰年就总天数加1天*/
152. {
153. s = s + 1;
154. }
156. n = (y-1+(y-1)/4-(y-1)/100+(y-1)/400+s+1)%7;
157. returnn;/*返回值是n*/
158. }/*end of int whatisita(int y,int m)*/
160. /*打印某年的全年日历*/
161. voidprintyearday()
162. {
163. inty, value, sum, i, j, k = 1;
164. charyn;
165. while(k)
166. {
167. printf("请输入查询的日历的年份： ");
168. scanf("%d",&y);
170. for(i = 1; i <= 12; i++)
171. {
172. printf(" %d年%d月
173. ",y,i);
174. value = whatisita(y, i);
175. sum = everymonth(y, i);
176. printmonth(value, sum);
177. printf("\n\n");
178. }
180. printf("是否继续查询(Y/N)?");
181. scanf("%c",&yn); getchar();
183. if(yn =='Y'|| yn =='y')
184. {
185. k = 1;
186. }
187. else
188. {
189. k = 0;
190. }
191. }/*end of while (k)*/
192. }/*end of void printyearday()*/
194. /*查询某月最大天数*/
195. inteverymonth(intyear,intmonth)/*everymonth是有参函数，year是年份，month是月份，返回值是整型*/
196. {
197. ints;
198. staticinta[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
199. s =a [month];
201. if(IsLeapYear(year) && month == 2)
202. {
203. s = s + 1;
204. }
206. returns;/*s是返回值*/
207. }/*end of int everymonth(int year, int month)*/
209. /*打印某年的某月最大天数函数*/
210. voidprintmonthday()
211. {
212. inty, m, value, k = 1;
213. charyn;
214. while(k)
215. {
216. printf("请输入查询的年份，月份: ");
217. scanf("%d,%d",&y,&m);
218. value = everymonth(y,m);
219. printf("%d年%d月的最大天数为%d.\n",y,m,value);
220. printf("是否继续查询(Y/N)?");
221. scanf("%c",&yn); getchar();
223. if(yn =='y'|| yn =='Y')
224. {
225. k = 1;
226. }
227. else
228. {
229. k = 0;
230. }
231. }/*end of while (k)*/
232. }/*end of void printmonthday()*/
234. /*打印月历*/
235. voidprintmonth(intvalue,intsum)/*printmonth是有参函数，value和sum是参数，无返回值*/
236. {
237. intn, i = 0, j;
238. char*x[7] = {"Sunday","Monday","Tuesday","Wenesday","Thursday","Friday","Saturday"};
240. for(j = 0; j < 7; j++)
241. {
242. printf("%-10s",x[j]);
243. }
245. printf("\n");
247. while(i < value)
248. {
249. printf(" ");
250. i++;
251. }
253. for(n = 1; n < 7-value; n++)
254. {
255. printf("%-10d",n);
256. }
258. while(n <= sum)
259. {
260. if((n + value - 1) % 7 == 0)
261. {
262. printf("\n");
263. }
264. if(n/10 > 0)
265. {
266. printf("%-10d",n);
267. }
268. else
269. {
270. printf("%-10d",n);
271. }
273. n++;
274. }/*end of while (n <= sum)*/
275. }/*end of void printmonth(int value,int sum)*/
277. /*查询某年某月日历*/
278. voidprintyearmonthday()
279. {
280. inty, m, value, sum, k = 1;
281. charyn;
282. while(k)
283. {
284. printf("请输入要查询日历的年份,月份： ");
285. scanf("%d,%d",&y,&m);
286. printf(" %d年%d月的日历\n",y,m);
287. value = whatisita(y,m);/*whatisit 函数返回一个值，返回值是本月的第一天是星期几*/
288. sum = everymonth(y,m);/*everymonth 函数返回一个值，返回值是本月的最大天数*/
289. printmonth(value,sum);
290. printf("\n");
291. printf("是否继续查询(Y/N)?");
292. scanf("%c",&yn); getchar();
293. if(yn =='y'|| yn =='Y')
294. {
295. k = 1;
296. }
297. else
298. {
299. k = 0;
300. }
301. }/*end of while (k)*/
304. }/*end of void printyearmonthday()*/

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总结：写程序需要耐心和细心，需要反复检查，防止遗漏。