#include?<stdio.h>
int?main()?
{?
????/*?定義需要計算的日期?*/
????int?year?=?2008;
????int?month?=?1;
????int?day?=?1;
????/*
?????*?請使用switch語句，if...else語句完成本題
?????*?如有想看小編思路的，可以點擊左側任務中的“不會了怎么辦”
?????*?小編還是希望大家獨立完成哦~
?????*/
????
????int?i=0,ds=0;
????if(year%4==0){
????????i=1;
????}else
????i=0;
????
????switch(month-1)
????{
????????case?12:ds=ds+31;
????????case?11:ds=ds+30;
????????case?10:ds=ds+31;
????????case?9:ds=ds+30;
????????case?8:ds=ds+31;
????????case?7:ds=ds+31;
????????case?6:ds=ds+30;
????????case?5:ds=ds+31;
????????case?4:ds=ds+30;
????????case?3:ds=ds+31;
????????case?2:ds=ds+28+i;
????????case?1:ds=ds+31;
????????default:printf("error");
????????
????}
????printf("是第%d天",ds+day);
????
????return?0;
}

輸出顯示: error是第一天

我沒有寫break 為什么case語句沒有被執行 而default語句會被執行呢