数据结构c语言多项式之和

#include<stdio.h>
#include<malloc.h>
typedef struct NODE{
    int coef;
int exp;
struct NODE *next;
} SNODE;

void init(SNODE *head){
     head=(SNODE *)malloc(sizeof(SNODE));
 head->next=NULL;
}

void input(SNODE * head){
     SNODE *h,*s;
 int m,n;
 h=head;
 printf("请输入方程的系数和指数:");
 scanf("%d%d",&m,&n);
 while(m!=0){
    s=(SNODE *)malloc(sizeof(SNODE));
s->coef=m;
s->exp=n;
h->next=s;
h=h->next;
    scanf("%d%d",&m,&n);
 }
 h->next=NULL;
}