求 C语言程序 详解

这是一个C语言程序代码 希望高手能给我将每一句的意思注释在后面 并最好能说出有什么亮点的地方 谢谢
#include <stdio.h>
int main()
{
int day,mn,yr,i,days=0,s,k;
int mont[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
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-month-day):");
scanf("%d-%d-%d",&yr,&mn,&day);