#include <stdio.h>
#include <math.h>

#define eps 1e-6

int main(void)
{
	int i;
	double x=0, y, delta;

	do 
	{
		y=cos(x);
		delta=fabs(y-x);
		x=y;
		printf("cos(%lf)=%lf \n",x,cos(x));
	} while (delta > eps);

	// printf("cos(%lf)=%lf \n",x,cos(x));

	return 0;
}