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用QSORT注意点

Posted by Cleaf at 2014-02-10 22:43:23 on Problem 1328
因为qsort返回值为int 类型,所以不能用 return *a-*b!!这样子精度不够!
可以写int cmp(const void* _a,const void* _b)
{
	double *a=(double*)_a;
	double *b=(double*)_b;
	if(a[0]-b[0]<0) return -1;
	else if(a[0]==b[0]) return 0;
	else return 1;
}
不可以写
int cmp(const void* _a,const void* _b)
{
	double *a=(double*)_a;
	double *b=(double*)_b;
return (int )*a-*b;
}

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