一元多项式的c++描述加法

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

typedef struct polynode 
{ 
int coef; //多项式的系数 
int exp; //指数 
struct polynode *next; 
}node; 

node *create() //用尾插法建立一元多项式的链表 
{ 
node *h,*r,*s; 
int c,e; 
h=(node*)malloc(sizeof(node)); 
r=h; 
printf("coef:"); 
scanf("%d",&c); 
printf("exp: "); 
scanf("%d",&e); 
while(c!=0) //输入系数为0时，多项式的输入结束 
{ 
s=(node*)malloc(sizeof(node)); 
s->coef=c; 
s->exp=e; 
r->next=s; 
r=s; 
printf("coef:"); 
scanf("%d",&c);