c语言单片机外部存储,C语言直接操作指定内存和外部内存（吧主捣乱之4）

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#include

//#define char signed char

typedef unsigned int u16;

typedef unsigned char u8;

#define Addr_RAM 0x1000 //数值个数开始地址

#define Addr_Number_RAM 0x0030 //正零负数量地址

signed xdata talble[20] _at_(0x1000);

signed xdata table[20]={-1,-2,-3,-4,-5,0,0,1,2,3,4,5,6,7,8,9,10,-1,-10,20};

u16 xdata *iptr;

u8 idata *iptr1;

void main(void)

{ u8 i,k,l,m;

signed j;

for (i=0; i<20; i++)

{ j=(table[i]);

if(j>0)

{k++;

iptr1=Addr_Number_RAM;

*iptr1=k;

}

}

for (i=0; i<20; i++)

{ j=(table[i]);

if(j==0)

{l++;

iptr1=Addr_Number_RAM+1;

*iptr1=l;

}

}

for (i=0; i<20; i++)

{ j=(table[i]);

if(j<0)

{m++;

iptr1=Addr_Number_RAM+2;

*iptr1=m;

}

}

while(1);

}

编写一段程序，将外部RAM中1000H单元开始的20个带符号数，按照正数、零、负数进行分类统计，将正数、零、负数的个数分别存放到内部RAM的30H、31H、32H单元中。