//######################################################################
// FILE       :	draw_poly_ohadbara.c
// WRITER     :	ohad barak, 033800467
// EXERCISE   : 1a 
// DESCRIPTION:	the program reads the order of a polynom from standard
//		input ( the keyboard or a file ).
//		then it reads the polynom coefficients.
//		Next, it calculates the value ( the f(x) ) of the polynom
//		for every x between -10 and 10	and prints it to
//		standard output ( the screen or a file ).
// INPUT FILE NAME:	draw_poly_ohadbara.input
//
// EXAMPLE INPUT1:	3 17 -5 6 2
// EXAMPLE INPUT2:	3
//			17
//			-5
//			6
//			2
//
//		both inputs are the same, as far as scanf is concerned.
//		The meaning of this input is a polynom of a 3rd order
//		that looks like this:
//		17*x^0 -5*x^1 +6*x^2 +2*x^3
//
// the output will be a long list of pairs of x and f(x):
//		     .        .
//		     .        .
//		     .        .
//              -0.029866 6.853291
//              -0.019866 6.901836
//              -0.009866 6.950958
//              0.000134 7.000668
//              0.010134 7.050978
//              0.020134 7.101900
//		     .        .
//		     .        .
//		     .        .
//######################################################################

#include <stdio.h>

int main() {
	int	n;	// order (haseder) of the polynom.
	int	i;
	int	*poly;	// pointer to an array that will contain the polynom coefficients ( hamekadmim ).
	float	sum;
	float	x;

	scanf("%d", &n);	// input the order of the polynom.
	n++;	// think - why do we need to do this?

	poly = (int *) malloc(n*sizeof(int));	// allocate memory for the polynom array.
	for (i=0; i<n; ++i ) {
		scanf("%d", &poly[i]);		// input the polynom coefficients.
	}
	for ( x=-10.0; x<=10.0; x+=0.01 ) {	// a loop that goes over the x values from -10 to 10.
		for (sum=0, i=0; i<n; i++ ) {	// a loop that calculates the polynom value for every x.
			sum+=poly[i]*pow(x,i);
		}
		printf("%f %f\n", x, sum);	// print the x value and f(x) value for this x.
						// now we can redirect this output to a file ( like this: ./draw_poly > ex1a_output ).
						// and then we can draw the file using gnuplot.
	}
}