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//Adding two polynomials 
#include<stdio.h>
#include<stdlib.h>

typedef struct link {
    int coeff;
    int pow;
    struct link * next;
} my_poly;

void my_create_poly(my_poly **);
void my_show_poly(my_poly *);
void my_add_poly(my_poly **, my_poly *, my_poly *);

void main() {
    int ch;
    do {
        my_poly * poly1, * poly2, * poly3;

        printf("\nCreate 1st expression\n");
        my_create_poly(&poly1);
        printf("\nStored the 1st expression");
        my_show_poly(poly1);

        printf("\nCreate 2nd expression\n");
        my_create_poly(&poly2);
        printf("\nStored the 2nd expression");
        my_show_poly(poly2);

        my_add_poly(&poly3, poly1, poly2);
        my_show_poly(poly3);

        printf("\nAdd two more expressions? (Y = 1/N = 0): ");
        scanf("%d", &ch);
    } while (ch);
}


void my_create_poly(my_poly ** node) {
    int flag;
    int coeff, pow;
    my_poly * tmp_node;
    tmp_node = (my_poly *) malloc(sizeof(my_poly));
    *node = tmp_node;
    do {

        printf("\nEnter Coeff:");
        scanf("%d", &coeff);
        tmp_node->coeff = coeff;
        printf("\nEnter Pow:");
        scanf("%d", &pow);
        tmp_node->pow = pow;

        tmp_node->next = NULL;


        printf("\nContinue adding more terms to the polynomial list?(Y = 1/N = 0): ");
        scanf("%d", &flag);

        if(flag) {
            tmp_node->next = (my_poly *) malloc(sizeof(my_poly));
            tmp_node = tmp_node->next;
            tmp_node->next = NULL;
        }
    } while (flag);
}


void my_show_poly(my_poly * node) {
    printf("\nThe polynomial expression is:\n");
    while(node != NULL) {
        printf("%dx^%d", node->coeff, node->pow);
        node = node->next;
        if(node != NULL)
            printf(" + ");
    }
}

void my_add_poly(my_poly ** result, my_poly * poly1, my_poly * poly2) {
    my_poly * tmp_node;
    tmp_node = (my_poly *) malloc(sizeof(my_poly));
    tmp_node->next = NULL;
    *result = tmp_node;

    while(poly1 && poly2) {
        if (poly1->pow > poly2->pow) {
            tmp_node->pow = poly1->pow;
            tmp_node->coeff = poly1->coeff;
            poly1 = poly1->next;
        }
        else if (poly1->pow < poly2->pow) {
            tmp_node->pow = poly2->pow;
            tmp_node->coeff = poly2->coeff;
            poly2 = poly2->next;
        }
        else {
            tmp_node->pow = poly1->pow;
            tmp_node->coeff = poly1->coeff + poly2->coeff;
            poly1 = poly1->next;
            poly2 = poly2->next;
        }

        if(poly1 && poly2) {
            tmp_node->next = (my_poly *) malloc(sizeof(my_poly));
            tmp_node = tmp_node->next;
            tmp_node->next = NULL;
        }
    }

    while(poly1 || poly2) {

        tmp_node->next = (my_poly *) malloc(sizeof(my_poly));
        tmp_node = tmp_node->next;
        tmp_node->next = NULL;

        if(poly1) {
            tmp_node->pow = poly1->pow;
            tmp_node->coeff = poly1->coeff;
            poly1 = poly1->next;
        }
        if(poly2) {
            tmp_node->pow = poly2->pow;
            tmp_node->coeff = poly2->coeff;
            poly2 = poly2->next;
        }
    }

    printf("\nAddition Complete");
}