c语言中 1 ind00,一个线性方程组结果为-1.#IND00的问题？

#include

#include

#define  MAX_N 20

#define  MAXREPT 100

#define  eps 0.00001

int main()

{

int n=8;

int p,q,k;

double err,w=1.5;

static double b[8][8],g[8];

static double x[8],nx[8];

static double a[8][8] =

{

{20,20,1,0,0,0,-1060,-1060},

{352,20,1,0,0,0,-118976,-6760},

{20,318,1,0,0,0,-1060,-16854},

{352,318,1,0,0,0,-122496,-110664},

{0,0,0,20,20,1,-380,-380},

{0,0,0,352,20,1,-6688,-380},

{0,0,0,20,318,1,-6600,-104940},

{0,0,0,352,318,1,-116160,-104940}

};

static double c[8] = {53,338,53,348,19,19,330,330};

for (p=0;p

for (q=0;q

{

b[p][q]=-a[p][q]/a[p][p];

g[p]=c[p]/a[p][p];

}

for (p=0;p

{

for (q=0;q

nx[q]=g[q];

for (q=0;q

{

for (k=0;k

nx[q]+=b[q][k]*nx[k];

for (k=q+1;k

nx[q]+=b[q][k]*x[k];

nx[q]=(1-w)*x[q]+w*nx[q];

}

err=0;

for (q=0;q

if (err

for (q=0;q

x[q]=nx[q];

if (err

{

printf("Solve...x_i=\n");

for (p=0;p

return 0;

}

}

printf("After %d repeat,no result...\n",MAXREPT);

return 1;

}

这是用超松弛迭代法求解线性方程组的解的程序，可是结果却全是-1.#IND00，不知道是哪里出了问题，求高手解答！

-1.#IND00是什么意思？为什么会出现这样的结果，该如何解决？