Untitled

#include<stdio.h>
#define f(x)(a*x*x+b*x+c)
float a,b,c;
void main()
{
	float x,h,d;
	printf("Enter the coefficients of quadratic polynomial a b and c:\n");
	scanf("%f%f%f",&a,&b,&c);
	printf("enter x:");
	scanf("%f",&x);
	printf("enter h:");
	scanf("%f",&h);
	d = (f(x) - f(x-h))/h;
	printf("derivative at x=%.3f is = %.3f",x,d);	
}