PtPoly PolySubtraction (PtPoly ppoly1, PtPoly ppoly2)
{
PtPoly Sub; unsigned int Degree, I, Invert = 0;
if (!ValidPolys (ppoly1, ppoly2)) return NULL;
if(ppoly1->Degree < ppoly2->Degree) {
Degree = ppoly1->Degree ;
Invert = 1;
}else{
Degree = ppoly2-> Degree;
}
if ((Sub = PolyCopy ((ppoly1->Degree >= ppoly2->Degree) ? ppoly1 : ppoly2)) == NULL) { Error = NO_MEM; return NULL; }
Error = OK;
if (Invert) Sub = PolySymmetrical(Sub);
for (I = 0; I <= Degree; I++)
Sub->Poly[I] = ppoly1->Poly[I] - ppoly2->Poly[I];
ReducePoly(Sub);
return Sub;
}
int main (void)
{
PtPoly poly1 = NULL, poly2 = NULL, poly3 = NULL;
char filename[21]; int st, degree, i; double coef;
system ("clear");
printf ("\nLer polinomio do ficheiro - Read polynomial from a text file\n");
do
{
printf ("Nome do ficheiro (Filename) -> ");
st = scanf ("%20[^\n]", filename);
scanf ("%*[^\n]"); scanf ("%*c");
} while (st == 0);
poly1 = PolyCreateFile (filename);
printf ("\nPolinomio lido do ficheiro - Polynomial acquired from text file %s\n", filename);
WritePoly (poly1);
poly2 = PolySymmetrical (poly1);
printf ("\nPolinomio simetrico - Symmetrical polynomial\n");
WritePoly (poly2);
PolyDestroy (&poly2);
printf ("\nLer polinomio do teclado - Read polynomial from keyboard\n");
do
{
printf ("grau do polinomio (polynomial's degree)? "); scanf ("%d", °ree);
scanf ("%*[^\n]"); scanf ("%*c");
} while (degree < 0);
poly2 = PolyCreate (degree);
for (i = 0; i <= degree; i++)
{
do
{
printf ("Coeficiente do polinomio (polynomial's coefficient)? "); st = scanf ("%lf", &coef);
scanf ("%*[^\n]"); scanf ("%*c");
} while (st == 0);
PolyModifyCoefficient (poly2, i, coef);
}
printf ("\nPolinomio lido do teclado - Polynomial acquired from keyboard\n");
WritePoly (poly2);
printf ("\nEscrever polinomio no ficheiro - Storing the polynomial in a text file\n");
do
{
printf ("Nome do ficheiro (Filename) -> ");
st = scanf ("%20[^\n]", filename);
scanf ("%*[^\n]"); scanf ("%*c");
} while (st == 0);
PolyStoreFile (poly2, filename);
poly3 = PolyAddition (poly1, poly2);
printf ("\nPolinomio soma - Sum polynomial\n");
WritePoly (poly3);
PolyDestroy (&poly3);
poly3 = PolySubtraction (poly1, poly2);
printf ("\nPolinomio diferenca - Difference polynomial\n");
WritePoly (poly3);
PolyDestroy (&poly3);
poly3 = PolyMultiplication (poly1, poly2);
printf ("\nPolinomio produto - Product polynomial\n");
WritePoly (poly3);
printf ("\nDestruir os polinomios - Releasing the polynomials\n");
PolyDestroy (&poly1);
PolyDestroy (&poly2);
PolyDestroy (&poly3);
WritePoly (poly3);
return 0;
}