两道选择题

#include <stdio.h>

int main()
{
    int i,a=0;
    for(i=0;i<5;i++){
        switch(i)
        {
            case 1:
                a++;
            case 2:
                --a;
            case '3':
                a+2;
            case 4:
                --a;
            default:
                break ;;            
        }
    }
    printf("a=%d\n",a);
    return 0;
}

问执行结果是？？还是细节，我又没注意！！！

那这段代码呢？？还好我做出来了~~

    unsigned char*ptr1 = 0x30080000;
    unsigned int* ptr2 = 0x30080000;
    ptr1+=8;
    ptr2+=8;
    printf("%x\n",ptr1);
    printf("%x\n",ptr2);