不想功亏一篑啊，但目前想不出好的解决方法，望提点~~~
#include<iostream>#include<cstdlib>
#include<cmath>
using namespace std;
const int data=5;
class linklist;
class snode
{
public:
friend class linklist;
private:
int coef;
int expn;
int data;
snode *next;
};
class linklist
{
private:
snode *head;
public:
linklist();
~linklist();
bool isempty();
void insertlist();
void treavlist1();
//void answer();
};
linklist::linklist()
{
head=new snode;
if(head->next==NULL)
{
cerr<<"memory allocation failare!"<<endl;
return ;
}
head->next=NULL;
}
linklist::~linklist()
{delete head;}
bool linklist::isempty()
{
return head->next==NULL;
}
void linklist::insertlist()
{
int expn=0,m,n;
int coef;
snode *p=head;
snode *q=NULL;
snode *newp;
cout<<"请输入计算的项数： ";
cin>>n;
cout<<"请分别输入项的未知量x的系数： ";
for(m=0;m!=n;m++)
{
newp=new snode;
if(newp==NULL)
{
cerr<<"memory allocation failare!"<<endl;
exit(1);
}
cin>>coef;
newp->data=data;
newp->coef=coef;
newp->expn=expn++;
if(!p)
p->next=newp;
else
{
p->next=newp;
p=newp;
}
}
newp->next=NULL;
}
void linklist::treavlist1()
{
snode *p=head->next;
if(!p)
{
cout<<"多项式为空！"<<endl;
return ;
}
while(p)
{
if(p!=head->next&&p->coef>0)
cout<<"+";
if(p->expn!=0)
cout<<p->coef<<"x"<<p->expn;
else
cout<<p->coef;
p=p->next;
}
}
/*void linklist::answer()
{
snode *p=head->next;
if(!p)
{
cout<<"无法计算多项式的值！"<<endl;
return ;
}
int s=0;
while(p)
{
s+=(p->coef)*pow(p->data,p->expn); //“pow”重载函数的调用不明确，该如何解决啊
p=p->next;
}
}*/
int main()
{
linklist L;
if(L.isempty())
L.insertlist();
cout<<"输入的多项式为： ";
L.treavlist1();
cout<<endl;
cout<<"代入未知数变量x的值后，多项式的值为： ";
//L.answer();
system("pause");
return 0;
}
