//  Newton Method

#include <stdio.h>
#include <math.h>
#define eps 1e-6

int k;
void main(void)
{  
 double x1;
 double x2;
 double f(x,k); 
 double g(x,k);
 int i;

 printf("1...2sin(x)-x=0   2...x*x-5=0   e...End\n");
 while (printf("Input k="), scanf("%d",&k)!=0){
  printf("x1=");
  scanf("%lf",&x1); 
 //  printf("x1=%f\n",x1);
  i=1;
  printf("%3d %10.6f %10.6f\n",i,x1,f(x1,k));     
     while (fabs(f(x1,k))>eps ){
       x2=x1-f(x1,k)/g(x1,k);
       i=i++;
       printf("%3d %10.6f %10.6f\n",i,x2,f(x2,k)); 
       x1=x2;
	   
	}
  	 printf("  Ans=%f\n",x2); 
  }
 }


//def function f
 double f(double x,int k)
  {
	switch(k)
    {
	case 1:
		return 2*sin(x)-x;
		break;
	case 2:
		return x*x-5;
		break;
	default:
		return 0;
        break;
	}
 }

//def function g
 double g(double x,int k)
  {
	switch(k)
    {
	case 1:
		return 2*cos(x)-1;
		break;
	case 2:
	    return 2*x;
		break;
	default:
		return 0;
        break;
	}
 }