黑色星期五

来源：互联网发布：js构造函数参数是对象编辑：程序博客网时间：2024/04/26 19:54

在西方，星期五和数字 13都代表着坏运气，两个不幸的个体最后结合成超级不幸的一天。所以，不管哪个月的十三日又恰逢星期五就叫“黑色星期五”。

要求：输入年份，输出是：判断该年是否包含黑色星期五，如包含，给出具体日期

参考代码：

#include<stdio.h>  int main(){int month[10];int a[13]={0,12,43,71,102,132,163,193,224,255,285,316,346};int b[13]={0,12,43,72,103,133,164,194,225,256,286,317,347};//闰年时int n=0,i,year;scanf("%d",&year);//能被四整除但不能被四百整除以及能被一百整除的年份是闰年if(((year%4==0)&&(year%400!=0))||(year%100==0))//闰年时{for(i=1;i<=12;i++){if((year*365+(year-1)/4-year/100+year/400+b[i])%7==5){month[n]=i;n++;}}}else//平年{for(i=1;i<=12;i++){if((year*365+year/4-year/100+year/400+a[i])%7==5){month[n]=i;n++;}}}if(n==0){printf("There is %d Black Friday in year %d.\n",n,year);}else{if(n==1){printf("There is %d Black Friday in year %d.\nIt is:\n",n,year);printf("%d/%d/%d\n",year,month[0],13);}else{printf("There are %d Black Fridays in year %d.\nThey are:\n",n,year);for(i=0;i<n;i++)printf("%d/%d/%d\n",year,month[i],13);}}return 0;}

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