请教问题

wjnforever

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http://www.52rd.com/bbs/dispbbs.asp?boardID=38&ID=2048&page=1
一个指针数组定义，在编译ccs上编译有问题，但是在vc上有没有问题，请教！
我写了一个小程序
/*三段内存地址*/
#define SDRAM1 0x80000000
#define SDRAM2 0x83400000
#define SDRAM3 0x86600000
/*定义三个分别指向单元首地址的指针
unsigned volatile int *ptr_SDRAM1 = (unsigned volatile int *)SDRAM1;
unsigned volatile int *ptr_SDRAM2 = (unsigned volatile int *)SDRAM2;
unsigned volatile int *ptr_SDRAM3 = (unsigned volatile int *)SDRAM3;
/*定义一个指针数组*/
unsigned volatile int *ptr_SDRAM[3] = {ptr_SDRAM1, ptr_SDRAM2,
ptr_SDRAM3};
void main（）
{}
我在ccs上编译，总是提示指针数组定义那一行出错，error: expression must
have a constant value。我就不明白了？

然后我把指针数组定义成这样，又提示没有错了：
unsigned volatile int *ptr_SDRAM[3] = {(unsigned volatile int *)
SDRAM1, (unsigned volatile int *)SDRAM2, (unsigned volatile int *)
SDRAM3};

最后我又做了一次修改，结果又提示出错：
unsigned volatile int *ptr_SDRAM[3]；
ptr_SDRAM[1]=(unsigned volatile int *)SDRAM2；

大家帮我解惑啊？：）

unsigned volatile int *ptr_SDRAM1 =（* (unsigned volatile int *)SDRAM1）;
unsigned volatile int *ptr_SDRAM2 = （*(unsigned volatile int *)SDRAM2）;
unsigned volatile int *ptr_SDRAM3 = （*(unsigned volatile int *)SDRAM3）;

楼下xd的方案不明白阿，指针 等于 SDRAM1 指向的值？