lind6-13.c

谭浩强第二版的课后习题的答案的源程序

#include<stdio.h>
#include<math.h>
void main()
{
	float x1=-10,x2=10,x3=0,y1=-1,y2=1,y3=1;
	for(;(fabs(y3))>(1e-6);)
	{
		y1=2*x1*x1*x1-4*x1*x1+3*x1-6;
		y2=2*x2*x2*x2-4*x2*x2+3*x2-6;
		y3=2*x3*x3*x3-4*x3*x3+3*x3-6;
		if(y1*y3<0)
		{
			x2=x3;
		}
		if(y2*y3<0)
		{
			x1=x3;
		}
		x3=(x1+x2)/2;
	}
	printf("%.2f",x3);
}