解非线性方程的双点弦截法的c程序

				/* chord2m.c: two points chord iterative method */
				#define MI 100
				#include "chord2.c"
				double f(double x);
				extern int chord2(double x[2]);
				void main()
				{
					int k;
					double x[2];
					system("cls");
					printf("Two points Chord iterative method:\n");
					x[0]=2.0*atan(1.0);
					x[1]=2.0*x[0];
					k=chord2(x);
					if(k>=MI) printf("%d times iterative isn't success!\n",k);
					else printf("Ok!  k=%d  root=%15.8f\n",k,x[1]);
					getch();
				}
				/****function f()****/
				double f(double x)
				{
					double y;
					y=sin(x)-x/2.0;
					return(y);
				}