Report9

#include <stdio.h> 
#include <math.h>
double h[7]={0.5,0.1,0.01,0.001,0.0001,0.00001,0.000001};
double function(double x); 
double function_plus(double x,double h); 
double function_minus(double x,double h);
int main() 
{ 
	double x= 3.5; 
	double derivative1 = 0; 
	double derivative2 = 0;
	printf(" h 	f(x)' f(x)''\n"); 
	for(int i=0;i<7;i++) 
	{ 
		derivative1=(function_plus(x,h[i])-function_minus(x,h[i]))/(2*h[i]); 
		derivative2=(function_plus(x,h[i])-(2*function(x))+function_minus(x,h[i]))/(pow(h[i],2));
		printf("%lf %lf %lf\n",h[i],derivative1,derivative2); 
	}
	return 0; 
}
double function(double x) 
{ 
	return 1/x; 
}
double function_plus(double x,double h) 
{ 
	return 1/(x+h); 
}
double function_minus(double x,double h) 
{ 
	return 1/(x-h); 
}
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