C语言统计文本字母出现次数按从大到小顺序排，急用高分

#include <stdio.h>

#include <string.h>

void countc(int count[])

{

int index = 0;

char ch;

for (i = 0; i < 25; i++)

{

count[i] = 0;

}

FILE *fp = fopen("D:\\Data.txt", "r");

while((ch = fgetc(fp))!=EOF)

{

index = ch - 65;

if(index >= 0 && index < 26 ) count[index]++;

else

{

index = ch - 32;

if(index >= 0 && index < 26 ) count0[index]++;

}

}

}

void Swap(int &a,int &b)

{

a=a^b;

b=a^b;

a=a^b;

}

void main()

{

int cnt [26] = {0};

FILE *fp = fopen("D:\\Result.txt", "w");

countc(cnt);

char ch[26];

for(int i=0;i<26;i++)

{

ch[i]=i+65;//把字母赋值进数组

}

for (int i = 0; i < 26; i++)

{

for(int j=25;j>i;J--)

{

if(cnt[j]<cnt[j-1]])

{

Swap(cnt[j],cnt[j-1]);

ch[j]=ch[j]^ch[j-1];

ch[j-1]=ch[j]^ch[j-1];

ch[j]=ch[j]^ch[j-1];

}

}

}

for(int i=0;i<26;i++)

{

cout<<ch[i]<<"字母个数为"<<cnt[i]<<endl;

}

getchar();

}