當(dāng) case1:sum為什么等于0
case 1:sum=0;break;
??????? case 2:sum=31;break;
??????? case 3:sum=59;break;
??????? case 4:sum=90;break;
??????? case 5:sum=120;break;
??????? case 6:sum=151;break;
??????? case 7:sum=181;break;
??????? case 8:sum=212;break;
??????? case 9:sum=243;break;
??????? case 10:sum=273;break;
??????? case 11:sum=304;break;
??????? case 12:sum=334;break;
???
2016-01-29
因為一月八號就是這一年的第八天。