随记-------不定期添加遗忘知识点

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char
*get_status_str(int
status)

{

　　return
(char *[]){"linkdown","partial-linkup","full-linkup","N/A"}[status];

}

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#include <stdio.h>

int main() {

    const
int a=9;

    int
*p=(int*)&a;

    *p=10;

    printf("%p %p\n", &a, p);       //0012FF7C 0012FF7C

    printf("a: %d , *p %d\n",a,*p); //a: 9 ,*p: 10

    return
0;

}

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#define CHANGE_ENDIAN_DW(data)  (data<<24 | data>>24 | data>>8&0xff00 | data<<8&0xff0000)