addPolynomials

#include<stdio.h>
#include<stdlib.h>

struct Polynomial
{
   int deg;
   double *coeff;
};

struct Polynomial* addPolynomials(struct Polynomial* a, struct Polynomial* b) {
    int newDeg = a->deg > b->deg ? a->deg : b->deg;
    struct Polynomial* new = malloc(sizeof(*new));
    new->coeff = malloc((newDeg+1)*sizeof(*new->coeff));

    for (int i = newDeg - abs(a->deg - b->deg); i >= 0; i--) {
         new->coeff[i] = a->coeff[i] + b->coeff[i];
    }

    if (a->deg > b->deg) {
        for (int i = a->deg; i > a->deg - abs(a->deg - b->deg); i--) {
            new->coeff[i] = a->coeff[i];
        }
    } else {
        for (int i = b->deg; i > b->deg - abs(a->deg - b->deg); i--) {
            new->coeff[i] = b->coeff[i];
        }
    }

    //szukanie nowego stopnia wielomianu wyjœciowego
    for (int i = newDeg; i >= 0; i--) {
        if (new->coeff[i] != 0) {
              new->deg = i;
              return new;
        }
}
    new->deg = 0;
    return new;
}

int main()
{
    struct Polynomial *a=malloc(sizeof(*a));
    struct Polynomial *b=malloc(sizeof(*b));
    struct Polynomial *c=malloc(sizeof(*c));
    int i;
    printf("Podaj stopien wielomianu a \n");
    scanf("%d",&a->deg);
    a->coeff = malloc((a->deg+1)*sizeof(*a->coeff));
    printf("Podaj stopien wielomianu b \n");
    scanf("%d",&b->deg);
    b->coeff = malloc((b->deg+1)*sizeof(*b->coeff));
    //a->coeff = {-1,1,3,0,1};
    for(i=a->deg;i>=0;i--)
    {
        printf("a[%d] = ",i);
        scanf("%lf",&a->coeff[i]);
    }
    //b->coeff = {1,-2,1};
    for(i=b->deg;i>=0;i--)
    {
        printf("b[%d] = ",i);
        scanf("%lf",&b->coeff[i]);
    }
    c = addPolynomials(a,b);
    for(i = c->deg;i >=0;i--)
        if(c->coeff[i] < 0.0)
           printf("-%lf x^%d",-c->coeff[i],i);
        else
           printf("+%lf x^%d",c->coeff[i],i);
    printf("%\n");
    system("PAUSE");
}