#include<stdio.h>
int main( )
{
    int k=5,n=0;
    do
    {
        switch(k)
        {
        case 1:
        case 3:
            n+=1;
            k--;
            break;
        default:
            n=0;
            k--;
        case 2:
        case 4:
            n+=2;
            k--;
            break;
        }
        printf("%d",n);
    }
    while(k>0 && n<5);
    return 0;
}

是啊，我要解释，能解释一下吗

如果default 后有break呢