/*
_________________________________________________本程序简单明了，利用四个外部变量传入界面，生成万年历。2013年5月1日
_________________________________________________
*/
#include<stdio.h>
#define Up 72
#define Down 80
#define Left 75
#define Right 77
#define Esc 27int week=1;//当前月份第一天为星期几
int month=10; //当前月份
int year=1990;//当前年份
int days=31;//当前月份的天数void interface(){//万年历的主界面int i;printf("\n\n");switch(month){case 1:printf("%-10s","January");break;case 2:printf("%-10s","February");break;case 3:printf("%-10s","March ");break;case 4:printf("%-10s","April");break;case 5:printf("%-10s","May");break;case 6:printf("%-10s","June");break;case 7:printf("%-10s","July");break;case 8:printf("%-10s","August");break;case 9:printf("%-10s","September");break;case 10:printf("%-10s","October");break;case 11:printf("%-10s","November");break;case 12:printf("%-10s","December");}printf("%10d\n",year);puts("--------------------------------------------------------------------");puts("Sunday    Monday    Tuesday   Wednesday Thursday  Friday    Saturday");for(i=1;i<=week;i++){printf("          ");}for(i=1;i<=days;i++){if(i!=0){printf("%-10d",i);}if((i+week)%7==0){ //i为界面空的日期，控制7个日期换一行。printf("\n");}}printf("\n");puts("--------------------------------------------------------------------");puts("[Press → next montch ]  [Press ← prior montch ]");puts("[Press ↓ next  year  ]  [Press ↑ prior year   ]");puts("[Press Esc exit       ] ");puts("                                                          ----by LR");
}int month_days(int m){//获取月份的天数int d=31;if(m==4||m==6||m==9||m==11){d=30;}if(m==2){if(year%4==0&&year%100!=0||year%400==0){d=29;}else{ d=28;}}return d;
}void next_month(){//下一个月份month++;if(month==13){year++,month=1;//到了‘13’月份，增加1年，变成下一年1月份。}days=month_days(month);week=(week+month_days(month-1))%7;//算出这个月的第一天为星期几。
}void prior_month(){//上一个月份month--;if(month==0){ year--,month=12;//到了‘0’月份，减去1年，变成上一年12月份。}days=month_days(month);week=(week-days%7+7)%7;//算出这个月的第一天为星期几。
}void next_year(){//下一个年份int i;for(i=0;i<12;i++){next_month();}
}void prior_year(){//上一个年份int i;for(i=0;i<12;i++){prior_month();}
}int main(){//搬红砖的小男孩原创作品，转载请标注。char A,i=1;while(1){system("cls");interface();printf("");A=getch();if(A==Right){next_month();}if(A==Left){prior_month();}if(A==Down){next_year();}if(A==Up){prior_year();}if(A==Esc){break;}}return 0;
}