Calculating the derivative of a polynomial function.

Derivada

/*
	Name: Derivada
	Copyright: 
	Author: Soares Barroso, Willame
	Date: 27/10/13 21:17
	Description: Calculation of the derivative of a polynomial function
*/

#include <stdlib.h>
#include <stdio.h>
main()
{
	printf("\n>>>>>>> Funcao Derivada de um Polinomio <<<<<<\n\n");
	float c[10],a[10];
	int grau,i;
	printf("Grau do polinomio (polynomial's degree): ");
	scanf("%d",&grau);
	for(i=grau;i>=0;i--){
	printf("Coeficiente de x^%d: ",i);
	scanf("%f",&c[i]);
	}
	for(i=0;i<=grau;i++){
		a[i]=c[i]*i;
	}
	printf("\nf'(x)= ");
	for(i=grau;i>=1;i--){
		if(i-1==0)
		printf("%.0f",a[i]);
		else
		printf("%.0fx^%d",a[i],i-1);
		if(i!=1)
		printf(" + ");
	}
}