请教一个有关c语言的问题

Question

错误如下：
yuan.cpp
i:\数据结构课程设计\yiyuanduoxiangshi\yuan.cpp(2) : error C2143: syntax error : missing ';' before 'PCH creation point'
i:\数据结构课程设计\yiyuanduoxiangshi\yuan.cpp(5) : error C2143: syntax error : missing ';' before 'PCH creation point'
i:\数据结构课程设计\yiyuanduoxiangshi\yuan.cpp(6) : error C2143: syntax error : missing ';' before '{'
i:\数据结构课程设计\yiyuanduoxiangshi\yuan.cpp(7) : error C2143: syntax error : missing ';' before 'PCH creation point'
i:\数据结构课程设计\yiyuanduoxiangshi\yuan.cpp(8) : error C2143: syntax error : missing ';' before 'PCH creation point'
i:\数据结构课程设计\yiyuanduoxiangshi\yuan.cpp(9) : error C2143: syntax error : missing ';' before 'PCH creation point'
i:\数据结构课程设计\yiyuanduoxiangshi\yuan.cpp(10) : error C2143: syntax error : missing ';' before 'PCH creation point'
i:\数据结构课程设计\yiyuanduoxiangshi\yuan.cpp(11) : fatal error C1004: unexpected end of file found
执行 cl.exe 时出错.

yiyuanduoxiangshi.exe - 1 error(s), 0 warning(s)

代码如下：

 #include<iostream>
using namespace std;
float sum;

typedef struct PNode
{
    float coef;
    int expn;
    struct PNode *next;
}PNode, *Polynomial;

void CreatePolyn(Polynomial &P,int n)
{//输入m项的系数和指数，建立表示多项式的有序链表P
    P = new PNode;
    P->next = NULL;
    int i;
    Polynomial s,pre,q;
    for( i=1; i<=n; ++i )
    {
        s = new PNode;
        cout<<"请输入系数和指数："<<endl;
        cin>>s->coef>>s->expn;
        pre = P;                        // pre用于保存q的前驱，初值为头结点
        q = P->next;                    // *q为第一个大于输入项指数的节点
        while( q && q->expn<s->expn )
        {
            pre = q;
            q = q->next;
        }
        s->next = q;
        pre->next = s;
    }
}

void AddPolyn(Polynomial &Pa,Polynomial &Pb)
{//多项式加法：Pa=Pa+Pb，利用两个多项式的节点构成和多项式
    Polynomial p1,p2,p3,r;

    p1 = Pa->next;  p2 = Pb->next;      //p1和p2初值分别指向Pa和Pb的首元结点
    p3 = Pa;                            //p3指向和多项式的当前节点，初值为Pa
    while( p1 && p2 )                   //p1和p2均非空
    {
        if( p1->expn == p2->expn )      //指数相等
        {
            sum = p1->coef + p2->coef;      //sum保存两项的系数和
            if( sum!=0 )                    //系数和不为零
            {
                p1->coef = sum;                     //修改Pa当前节点的系数值为两项系数的和
                p3->next = p1;  p3 = p1;            //将修改后的Pa当前节点链在p3之后，p3指向p1
                p1 = p1->next;                      //p1指向后一项
                r = p2; p2 = p2->next; delete r;    //删除Pb当前节点，p2指向后一项
            }
            else                                    //系数和为零
            {
                r = p1; p1 = p1->next;  delete r;
                r = p2; p2 = p2->next;  delete r;
            }
        }
        else if( p1->expn < p2->expn )  //Pa当前节点的指数值小
        {
            p3->next = p1;
            p3 = p1;
            p1 = p1->next;
        }
        else                            //Pb当前节点的指数值小
        {
            p3->next = p2;
            p3 = p2;
            p2 = p2->next;
        }
    }
    p3->next = p1?p1:p2;                //插入非空多项式的剩余段
    delete Pb;
}

void Output(Polynomial &Pa)
{
    Polynomial p;   //p用来指向当前节点
    p = Pa->next;
    cout<<"相加后的多项式为："<<endl;
    while ( p->next!=NULL )
    {
        cout<<p->coef<<"x^"<<p->expn<<"+";
        p = p->next;
    }
    cout<<p->coef<<"x^"<<p->expn<<endl;
}

void Userface()
{
    cout<<"           欢迎使用一元多项式加法器！              "<<endl;
    cout<<"---------------------------------------------      "<<endl;
//  cout<<"-                                           -      "<<endl;
    cout<<"-                                           -      "<<endl;
    cout<<"-                 1.计算                    -      "<<endl;
    cout<<"-                 2.退出                    -      "<<endl;
    cout<<"-                                           -      "<<endl;
//  cout<<"-                                           -      "<<endl;
    cout<<"---------------------------------------------      "<<endl;
    cout<<"请输入序号选择您需要的功能："<<endl;

}

void Jisuan()
{
    int n;
    cout<<"请输入第一个多项式项数："<<endl;
    cin>>n;
    Polynomial Pa;
    CreatePolyn(Pa,n);
    cout<<"请输入第二个多项式项数："<<endl;
    cin>>n;
    Polynomial Pb;
    CreatePolyn(Pb,n);
    AddPolyn(Pa,Pb);
    Output(Pa);
}

void Select()
{
    int k;
    cin>>k;
    switch(k)
    {
        case 1: Jisuan();
                break;
        case 2: exit(1);
        default:
                cout<<"输入错误，请重新输入："<<endl;
                Userface();
                Select();
                break;
}

 #include<iostream>
#include"Status.h"
using namespace std;

int main()
{
    Userface();
    Select();
    return 0;
}

Answer 1

void Select()定义中switch少后括号