为什么从文件中读取的数据保存到另一个文件中就成乱码了 ？

PloyIn.txt 中的数据为：
3 1 0 1 1 1 2
3 2 0 3 2 7 9
3 90 0 78 4 8 8
只输出一项
PloyOut.txt中数据为
3 0.000000 -1869574000
    请大神帮忙看看哪里出问题了 ？

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

typedef struct
{
     float coef;                        /*系数*/
    int expn;                         /*指数*/
}ElemType;
typedef struct LNode
{
     ElemType data;
    struct LNode *pNext;         
}LNode, *Ploynomial;

void menu ()
{
      printf ("************************************************************\n");
      printf ("------------------------------------------------------------\n");
      printf ("\t\t  多项式运算环境\t\t\n");
      printf ("------------------------------------------------------------\n");
     printf ("\t\t (1): 创建多项式\t\n");
     printf ("\t\t (2): 打印多项式\t\n");
     printf ("\t\t (3): 多项式相加\t\n");
     printf ("\t\t (4): 多项式相减\t\n");
     printf ("\t\t (5): 多项式相乘\t\n");
     printf ("\t\t (6): 多项式混合运算\t\n");
     printf ("\t\t (7): 退出多项式\t\n");
     printf ("************************************************************\n");
     printf ("请输入你的选择:  ");      
}

void InitList (Ploynomial Ployn)
{
     Ployn = (Ploynomial) malloc (sizeof (LNode));
     Ployn -> pNext == NULL;     
}

int ReadPloyn1(int n)
{
    FILE *fp;
    if ((fp = fopen("PloyIn.txt", "r")) == NULL)
    {
       printf ("错误！");
       exit(0);        
    }   
    fscanf (fp, "%d", &n);
    fclose (fp);
    return n;
}
void ReadPloyn(Ploynomial Ployn)                        
{
      FILE *fp;
     if ((fp = fopen("PloyIn.txt", "r")) == NULL)
     {
          printf ("无法读入文件!");
        exit (0);         
     }
     if (Ployn)
     {
          fscanf (fp, "%f %d ", &Ployn -> data.coef, &Ployn -> data.expn);        
     }
     fclose (fp);
}
void CreatePloyn(Ploynomial &head, int n)            /*创造一个头结点为head，项数为m的一元多项式*/
{
     int i;
     Ploynomial p;
     head = (Ploynomial ) malloc (sizeof (LNode));    /*创建头结点*/
     head -> pNext == NULL;
     for (i = 0; i < n; i++)
     {
          p = (Ploynomial ) malloc (sizeof (LNode));    /*创建新结点*/
          ReadPloyn (head);
          head -> pNext = p;
          head = p;
     }      
}
main()
{
     int i,n,m, choose;
     Ploynomial PloynA, PloynA1, PloynB, PloynC;
     InitList (PloynA);
     InitList (PloynB);
     while (1)
     {
         menu();
          scanf ("%d", &choose);
          switch (choose)
          {
              case 1 :
                   {
                        //PloynA = (Ploynomial)malloc(sizeof(LNode));
                        printf ("请读入多项式A \n");
                        m=ReadPloyn1 (n);
                        CreatePloyn (PloynA, m);
                        SavePloyn(  PloynA, m);
                        printf ("a : ");
                        //PrintPloyn(PloynA);
                        printf ("\n");
                        //CreatePloym(PloynA, m);
                        break;        
                   }           
            case 2 :   
                      {
                           //printf ("多项式a.  ");
                        //PrintPloyn(PloynA);        
                   }
         }
     }
     system ("pause");      
}