#include <stdio.h>
#include <math.h>
 
double f(double x){
	return cos(x)-x;
}
 
double f1(double x){
	return -sin(x)-1;
}
 
int main(void) {
	double eps=1.0e-6;
	double x=1;
	int kmax=10;
	double d;
	int k;
 
	k=0;
	do{
		d=-f(x)/f1(x);
		x +=d;
		k++;
		printf("k=%2d x=%19.16f d=%10.2e\n", k, x, d);
	}while(fabs(d)>eps &&k<kmax);
 
	if(fabs(d)>eps){
		printf("failure\n");
	}
 
	printf("f(x)=%9.2e\n", f(x));
 
	// your code goes here
	return 0;
}

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