帮我看看这段代码有什么问题？

[golden_alvin]

double PP1[8][8];
double PP2[8][8];

double x;
double n;
double d;
for(double i = 0; i < 8; i++)
{
n = i + 1;
d = n / (n * (n - 1) - (n - 2) * (n - 3) / 2);
x = (n - 1) * d;
for(double k = 0; k < i ; k++)
{
PP1[i][k] = x - k * d;
}
PP1[i][i] = x;
}
有六个错误：
e:\documents and settings\administrator\my documents\map\main.cpp(77) : error C2108: subscript is not of integral type
e:\documents and settings\administrator\my documents\map\main.cpp(77) : error C2108: subscript is not of integral type
e:\documents and settings\administrator\my documents\map\main.cpp(77) : error C2440: '=' : cannot convert from 'double' to 'double (*)[8]'
There is no context in which this conversion is possible
e:\documents and settings\administrator\my documents\map\main.cpp(79) : error C2108: subscript is not of integral type
e:\documents and settings\administrator\my documents\map\main.cpp(79) : error C2108: subscript is not of integral type
e:\documents and settings\administrator\my documents\map\main.cpp(79) : error C2440: '=' : cannot convert from 'double' to 'double (*)[8]'
There is no context in which this conversion is possible
怎么回事啊？

[roger_ding]

指明了是77、79行的错误，自己找吧

Compiler Error C2108
subscript is not of integral type
A nonintegral expression was used in an array subscript


Compiler Error C2440
'conversion' : cannot convert from 'type1' to 'type2'

The compiler was unable to cast from ‘type1’ to ‘type2.’ If you’ve encountered this error on code which compiled with an earlier version of Visual C++, please read Technote: Improved Conformance to ANSI C++ for more information.

The following example illustrates this error.

void main()
{


int *i;
float j;

j = (float)i; /* cannot cast from
pointer to int to float */


}

[iceeleca]

哥哥呀，怎么发贴子呀？我是新注册的，不知道，请帮忙！

[roger_ding]

在CSDN论坛上搜索“提问”，如果你视力没到1000的话

[brapler]

数组下标要用整形，要么把k,i之类的声明成整形，要么做过强制转换一下。

[菲斯可儿]

楼上说的对~