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//两个串表示数的除法,结果精确到小数点后第n位
char *sdivf(char *u, char *v, int n)
{
char *p, *f, *r, *q ;
unsigned int i, lu, lv, lr, iw, c, h ;
int kh, j ;
lu = strlen(u) ;
lv = strlen(v) ;
f = (char *)malloc((unsigned int)(lu + n + 3) * sizeof(char)) ;
q = (char *)malloc(sizeof(char)) ;
for (i = 0; i
f[i] = '