zoj 2420 Calendar

学习到一种很好的处理日期的方式

 

#include <stdio.h>int year[2] = {365, 366}; //0 非润年int month[2][12] = {{31,28,31,30,31,30,31,31,30,31,30,31},{31,29,31,30,31,30,31,31,30,31,30,31}}; //0 非润年的月份//2000年1月1日 Saturday char week[7][10]={"Saturday","Sunday","Monday","Tuesday","Wednesday","Thursday","Friday"};int isRun(int y){ if((y % 400 == 0) || (y % 4 == 0 && y % 100 != 0) ) return 1; //返回1 润年 return 0;}int main(){ int day, dayOfweek; while( scanf("%d",&day) == 1 && day != -1 ){ dayOfweek = day % 7; //day 对7 取模可以知道是周几 得先知道2000年1月1日 是周几 int i, j; for(i = 2000; day >= year[isRun(i)]; ++i){ day -= year[isRun(i)]; } for(j = 0; day >= month[isRun(i)][j]; ++j){ //i， j， k这些 别搞错 day -= month[isRun(i)][j]; } printf("%d-%02d-%02d %s/n",i, j + 1, day + 1, week[dayOfweek]); } return 0;}/*2004-09-26 Sunday2004-10-06 Wednesday2004-10-16 Saturday2004-10-17 Sunday*/