查找出现频率最多的字

#include<iostream.h>
#include<string.h>
#include<fstream.h>

struct word{
char name[30];
int num;
struct word *next;
};
void readfile(struct word*&head)
{
struct word*fp;

if((fp=fopen("in.txt","r"))==NULL)
{
cout<<"无法打开此文件!<<endl;
break;
}
char ch;
char temp[30];
struct word *p;
while(!feof(fp))
{
int i=0;
ch=fgetc(fp);
temp[0]=' ';
while((ch>='a'&&ch<='z')||(ch>='A'&&ch<='Z')||temp[0]==' ')
{
if(ch>='a'&&ch<='z'||ch>='A'&&ch<='Z')
{
temp[i]=ch;
i++;
}
ch=fgetc(fp);
if(feof(fp))
break;
}
temp[i]='\0';
p=head->next;
while(p)
{
if(!_stricmp(temp,p->name))
{
p->num++;
break;
}
p=p->next;
}
if(!p&&temp[0]!='\0')
{
p=new word;
strcpy(p->name,temp);
p->num=1;
p->next=head->next;
head->next=p;
}
}
}
void puts(struct word*&head)
{
struct word *q;
q=q->name;
}
void sort(struct word*&head)
{
struct word *ptr;
int a[10],i;
for(i=0;i<10;i++)
a[i]=0;
cout<<"文章中出现频率最高的十个单词如下:<<endl;
for(i=0;i<10;i++)
{
ptr=head;
while(ptr!=NULL)
{
if(ptr->num>a[i])
a[i]=ptr->num;
else
ptr=ptr->next;
}
ptr=head;
while(ptr!=NULL)
{
if(a[i]==ptr->num)
{
ptr->num=0;
cout<<"出现频率:cout<<a[i]<<endl;
puts(ptr->name);
break;
}
else
ptr=ptr->next;
}
}
}

void main()
{
struct word *head;
head=new word;
head->next=NULL;
readfile(head);
sort(head);
}