c语言万年历程序读不懂

#include <stdio.h>
int main()
{
int yr,i,days=0,s,k;
char wek[][9]={ {'S','u','n','d','a','y'},
{'M','o','n','d','a','y'},
{'T','u','e','s','d','a','y'},
{'W','e','d','n','s','d','a','y'},
{'T','h','u','r','s','d','a','y'},
{'F','r','i','d','a','y'},
{'S','a','t','u','r','d','a','y'}
};
printf("Inpute the date (year):");
scanf("%d",&yr);
s=yr-1+(int)((yr-1)/4)-(int)((yr-1)/100)+(int)((yr-1)/400)+days;
k=s%7;
printf("%d,%d,%d is %s.",yr,1,1,wek[k]);
return 0;
}
哪位大

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