P48

#include <math.h>
#include <fstream>
using namespace std;

double y(double x)
{   if(((x-2)>0)&&((5*x+1)>0))
	return (log(x-2)/sqrt(5*x+1));
	else return 00;
}

int main (void)
{
	ifstream ins("p48.txt");
	ofstream ous ("ans48.txt");
	double a,b,h,res;
	ins >> a >> b >> h;
	for (double i=a; i<=b; i+=h)
	{
		ous << i << " ";
		res=y(i);
		if (res!=00)
	    ous << res << endl;
		else ous << "no answer" << endl;
	}
}