为什么时先12到1呢,先1到12为什么是错误的
#include <stdio.h>
int main()
{
/* 定义需要计算的日期 */
int year = 2008;
int month = 8;
int day = 8;
int sum=day;
int run=0;
if ((year%400==0)||((year%4==0)&&(year/100!=0))){
run=1;
}
switch(month){
case 12: sum+=30;
case 11: sum+=31;
case 10: sum+=30;
case 9: sum+=31;
case 8: sum+=31;
case 7: sum+=30;
case 6: sum+=31;
case 5: sum+=30;
case 4: sum+=31;
case 3: if(run){
sum+=29;
}else{
sum+=28;
};
case 2: sum+=31;
case 1: sum+=0;break;
default: printf("wrong input");
}
printf("%d年%d月%d日是该年的第%d天",year,month,day,sum);
return 0;
}