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

int main(void) {
	
	double x =1e15;
	double x1 =1e16;
 
	double result = sqrt(x + 1) - sqrt(x);
	double result1 = sqrt(x1 + 1) - sqrt(x1);
	
	printf("sqrt(x + 1) - sqrt(x)");
	printf("result(10^15):%.25f\n",result);
	printf("result(10^16):%.25f\n",result1);
	printf("\n");
	
	double x2 =1e15;
	double x3 =1e16;
	
	double result2a= 1 / (sqrt(x2 + 1) + sqrt(x2));
	double result2b= 1 / (sqrt(x3 + 1) + sqrt(x3));
	
	printf("1 / (sqrt(x + 1) + sqrt(x))");
	printf("result2(10^15):%.25f\n",result2a);
	printf("result2(10^16):%.25f\n",result2b);
	return 0;
}