c/c++语言开发共享[c] 万年历

 #include <stdio.h> #include <stdlib.h> #include <string.h> #define str "   SUN   MON  TUE   WED   THU   FRI   SAT   "  void menu();         //操作菜单 int leap(int year);        //判断某年是不是闰年 int days_month(int year, int month);        //返回某月的天数 int someday(int year, int month, int day);    //计算某天是星期几 void search_month(int year, int month);        //输出某月的日历 void search_someday(int year, int month, int day);    //查询某日是星期几  int main() { 	int i, year, month, day; 	int k1, k2, k3, k4;    //用于判断输入的数据和操作是否正确，1代表正确，0代表错误 	int a = 1; 	menu(); 	do 	{ 		printf("请输入你要进行的操作(1-4):"); 		scanf_s("%d", &i); 		getchar(); 		switch (i) 		{ 		case 1: 			printf("请输入你要查询的年份："); scanf_s("%d", &year); 			for (a; a <= 12; a++) 			{ 				printf("nn---------*******   %d  *******------------n", a); 				search_month(year, a); 			} 			printf("---------*********************------------nnn"); 			break;   		case 2: 			printf("请输入您所要查询的相关信息.n"); 			printf("年份："); scanf_s("%d", &year); 			printf("月份："); scanf_s("%d", &month); 			k1 = 1; 			while (k1) 			{ 				if (month > 12 || month < 1) 				{ 					printf("你输入的月份有误，请重新输入!n"); 					printf("月份:"); 					scanf_s("%d", &month); 					if (month < 1 || month>12)    k1 = 1; 				} 				else k1 = 0; 			} 			search_month(year, month); 			printf("---------*********************------------nnn"); 			break;   		case 3: 			printf("请输入你要查询的日期n"); 			printf("年份："); scanf_s("%d", &year); 			printf("月份："); scanf_s("%d", &month); 			k2 = 1; 			while (k2) 			{ 				if (month > 12 || month < 1) 				{ 					printf("你输入的月份有误，请重新输入!n"); 					printf("月份:"); 					scanf_s("%d", &month); 					if (month < 1 || month>12)    k2 = 1; 				} 				else k2 = 0; 			} 			//    printf("%d年%d月有%d天n",year,month,days_month(year,month));     调试观察输入的日期是否有误，可忽略 			printf("日期："); scanf_s("%d", &day); 			k3 = 1; 			while (k3) 			{ 				if (day > days_month(year, month) || day < 1) 				{ 					printf("你输入的日期有误，请重新输入!n"); 					printf("日期:"); 					scanf_s("%d", &day); 					if (day > days_month(year, month) || day < 1)    k3 = 1; 				} 				else k3 = 0; 			} 			search_someday(year, month, day); 			printf("---------*********************------------nnn"); break;   		case 4:exit(0); 			printf("---------*********************------------nnn"); break;   		default: 			k4 = 1; 			while (k4) 			{ 				printf("你输入的数据有误，请重新输入你要进行的操作(1-4):"); 				scanf_s("%d", &i); 				if (i < 1 || i>4)    k4 = 1; 				else k4 = 0; 			} 			break; 		} 	} while (i > 0 && i < 5); 	return 0; }  void menu() { 	int i = 1; 	printf("nntt----------------------------------------n"); 	printf("tt|--------------------------------------|n"); 	printf("tt|           %d.  输出某年的日历         |n", i); 	printf("tt|           %d.  输出某月的日历         |n", i + 1); 	printf("tt|           %d.  查询某日是星期几       |n", i + 2); 	printf("tt|           %d.  退出系统               |n", i + 3); 	printf("tt|--------------------------------------|n"); 	printf("tt----------------------------------------nn");  }  int leap(int year) { 	if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) return 1; 	else return 0; }  int days_month(int year, int month) { 	int days_month; 	switch (month) 	{ 	case  1: 	case  3: 	case  5: 	case  7: 	case  8: 	case  10: 	case  12: days_month = 31; break;  	case  4: 	case  6: 	case  9: 	case  11:days_month = 30; break;  	case  2: 		if (leap(year) == 1) 		{ 			days_month = 29; break; 		} 		else days_month = 28; break; 	} 	return days_month; }  int someday(int year, int month, int day) { 	//该函数运用了特殊的计算公式，详细可参见 https://blog.163.com/hexin_mars_blog/blog/static/248215040201571351115699/ 	int someday, m, n, i;  //someday表示查询的日子是星期几 	m = year - year / 1000 * 1000; 	n = m - m / 100 * 100 - 1;            //用于获得年份的后两位数 	int days = 0; 	for (i = 1; i < month; i++) days = days + days_month(year, i); 	days = days + day; 	someday = (n + n / 4 - n / 100 + n / 400 + days) % 7; 	return someday; }  void search_someday(int year, int month, int day) { 	char weekname[20]; 	switch (someday(year, month, day)) 	{ 	case 0:strcpy_s(weekname, "星期天"); break; 	case 1:strcpy_s(weekname, "星期一"); break; 	case 2:strcpy_s(weekname, "星期二"); break; 	case 3:strcpy_s(weekname, "星期三"); break; 	case 4:strcpy_s(weekname, "星期四"); break; 	case 5:strcpy_s(weekname, "星期五"); break; 	case 6:strcpy_s(weekname, "星期六"); break; 	} 	printf("你所要查询的日期是%sn", weekname); }  void search_month(int year, int month) { 	int i = 0, j, k = 0, m;     //j用于记录某月的第一天是星期几   m用于记录某月的天数  k用于换行提示 	char x[10] = "      "; 	m = days_month(year, month); 	j = someday(year, month, 1);  	//输出某月的日历 	printf("------------------------------------------n"); 	printf("%sn", str); 	for (; i < j; i++) 	{ 		printf("%s", x); k++; 	} 	for (i = 1; i <= m; i++) 	{ 		k++; 		if (k % 7 == 0) 		{ 			if (i < 10) 			{ 				printf("    %d ", i); 				printf("n"); 			} 			else if (i >= 10) 			{ 				printf("   %d ", i); 				printf("n"); 			} 		} 		else 		{ 			if (i < 10) 			{ 				printf("    %d ", i); 			} 			else if (i >= 10) 			{ 				printf("   %d ", i); 			} 		} 	} 	printf("n------------------------------------------n"); }  void exit() { 	exit(0); } 

c/c++开发分享[c] 万年历地址：https://blog.csdn.net/xwh012510/article/details/85989654