牛顿迭代法求方程根

#include <stdio.h>
#include<math.h>
int main()
{
	float a, b, c, d;
	float f, F;
	float x = 1.5, x0;
	printf("输入方程系数:");
	scanf_s("%f %f %f %f", &a, &b, &c, &d);
	do{
		x0 = x;
		f = a * pow(x0, 3) + b * pow(x0, 2) + c * x0 + d;
		F = 3 * a * x0 * x0 + 2 * b * x0 + c;
		x = x0 - f / F;
	} while (fabs(x - x0) >= 1e-5);
	printf("x = %f", x);
}