我的想法是一旦输入回车就跳出多项式的输入，但是没效果！为什么

Question

#include<iostream>//#include<string>using namespace std;class polynomial{public:float coef;int exp;polynomial *next;//void count(polynomial *p,int x);};int main(){void count(polynomial *p,int x);// string str;polynomial *p;p=new polynomial;int e;float c;polynomial *q,*r;q=p;r=p;// cout<<p;// cout<<q;// cout<<r;while(1){cin>>c;if(c=='\n')break;// if(c==0)// continue;cin>>e;if(e=='\n')break;q->coef=c;q->exp=e;r->next=q;r=q;}// cout<<q;r->next=p;int x;cin>>x;count(p,x);return 0;}void count(polynomial *p,int x){float c;int e;int f=1;float num=0;polynomial *k,*m;k=p;m=p;while(k!=m){c=k->coef;e=k->exp;p=k->next;k=p;if(e>=1){for(e;e>0;e--){f=x*f;num+=c*f;}f=1;}if(e==0)num+=c;if(e<0){for(e;e<0;e++){f=f/x;num+=c*f;}f=1;}}cout<<num;}这是我的代码有一些语句是调试的时候注释掉了，无视就好。问题可能有不少吧~菜鸟一只，目前发现的主要问题就是main函数中构建链表的循环不跳出，我的想法是一旦输入回车就跳出多项式的输入。不过不能实现。也许还有一些其他的问题我还没发觉，想了好几个小时了，还是不能解决，求大神帮助下。谢谢

Answer 1

#include<iostream>
using namespace std;

class polynomial
{
public:
float coef;
int exp;
polynomial *next;
//void count(polynomial *p,int x);
};
int main()
{
float count(polynomial *p,int x);
polynomial *p;
p = new polynomial;
int e;
float c;
polynomial *q, *r;
q=p;
r=p;
cout <<"开始输入。"<<endl;
while(true)
{
cout<<"常数：";
cin>>c;
cout<<"指数：";
cin>>e;
q->coef = c;
q->exp = e;
r->next = q;
r = q;
cout << "是否继续添加？（Y/N)" << endl;
char ch;
cin >> ch;
if ('Y' != toupper(ch))
{
cout<<"多项式输入完毕！"<<endl;
break;
}
}
r->next = p;
int x;
cout << "自变量：";
cin>>x;
float res = count(p,x);
cout << "结果：" << res << endl;
system("pause");
return 0;
}
float count(polynomial *p,int x)
{
float c;
int e;
int f = 1;
float num=0;
polynomial *k,*m;
k = p;
m = p;
do
{
c=k->coef;
e=k->exp;
k=k->next;
if(e>=1)
{
for(;e>0;e--)
{
f=x*f;
}
num+=c*f;
f=1;
}
else if(e==0)
num+=c;
else
{
for(;e<0;e++)
{
f=f/x;
}
num+=c*f;
f=1;
}
}while(k != m);
return num;
}