void main()
{int y,m,d,days,flag=1;
printf("input year,month,day: ");
scanf("%d,%d,%d",&y,&m,&d);
switch(m)
{case 1:days=0;break;
case 2:days=31;break;
case 3:days=31+28;break;
case 4:days=31+28+31;break;
case 5:days=31+28+31+30;break;
case 6:days=31+28+31+30+31;break;
case 7:days=31+28+31+30+31+30;break;
case 8:days=31+28+31+30+31+30+31;break;
case 9:days=31+28+31+30+31+30+31+31;break;
case 10:days=31+28+31+30+31+30+31+31+30;break;
case 11:days=31+28+31+30+31+30+31+31+30+31;break;
case 12:days=31+28+31+30+31+30+31+31+31+31+30;break;
default:printf("input error of month!\n");flag=0;}
if(d2)&&((y%4==0)&&(y%100!=0)||(y%400==0)))
days++;
if (flag==1)
printf("year=%dmonth=%dday=%d----NO=%d\n",y,m,d,days);
}
这个程序里面有个flag,这个东西是什么意思，它代表什么，在这个程序中起到什么作用
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