数据结构多项式相加

#include <stdio.h>
#include <stdlib.h>//包含malloc(),free()函数
typedef struct LNode{
    float coef;//系数
    int expn;//指数
    LNode *next;
}LNode, *LinkList;//指针
void CreatPolyn(LinkList &L ,int m){
    LinkList p,q;
    L = (LinkList)malloc(sizeof(LNode));//头结点
    L->next = NULL;
    p = L;
    for (int i = 0; i < m; i++)
    {
        printf("enter coef and expn:");
        q = (LinkList)malloc(sizeof(LNode));//生成新结点
        q ->next = NULL;
        scanf("%f %d",&q->coef,&q->expn);
        p->next = q;//接到链尾
        p = q;//更新p
    }
}
LinkList AddPolyn(LinkList &La, LinkList &Lb){
    LinkList qa, qb, qc, Lc, qf1, qf2;//qf1, qf2用于释放结点的临时存储结点
    qa = La->next;//qa,qb指向对应链表当前结点
    qb = Lb->next;
    qc = Lc = La;//Lc是结果要存入的链表的头结点,qc表示当前指向结点
    while(qa && qb){
        if (qa->expn == qb->expn)
        {
            qa->coef += qb->coef;//遇到指数相同，系数相加到qa
            if (qa->coef != 0)//系数相加不为结果为0时
            {
                qc->next =qa;//链入qa
                qc = qa;//当前结点后移
                //这时要释放qb当前结点
                qf1 = qb;
                qa = qa->next;
                qb = qb->next;
                free(qf1);
            }else{//系数相加为结果为0时,指针后移，释放结点
                qf1 = qb;
                qf2 = qa;
                qa = qa->next;
                qb = qb->next;
                free(qf1);
                free(qf2);
            }
        }else if (qa->expn > qb->expn)//剩下指数不相等情况哪个指数小先存哪个
        {
            qc->next = qb;
            qc = qb;
            qb = qb->next;
        }else
        {
            qc->next = qa;
            qc = qa;
            qa = qa->next;
        }
    }
    qc->next =qa?qa:qb;//若有一条链剩余，就把剩下的都链入
    free(Lb);//释放Lb头结点
    return(Lc);
}
void PrintfPolyn(LinkList &L){
    while (L->next)//非空时
    {
        L = L->next;
        printf("your result is %.2f %d \n",L->coef,L->expn);
    }
}
int main() {
    int n1;
    int n2;
    LinkList La, Lb, Lc;
    printf("enter first num:");
    scanf("%d", &n1);
    CreatPolyn(La,n1);
    printf("enter second num:");
    scanf("%d", &n2);
    CreatPolyn(Lb,n2);
    Lc = AddPolyn(La, Lb);
    PrintfPolyn(Lc);
    system("pause");
    return 0;
}