软件工程作业------分析文本文档，统计出现频率最多的十个单词

在上周一软件工程的王老师给我们布置了作业，由于我们课程比较满，所以只能把敲代码的时间挪到了周末。但自己在敲代码之前利用零散的时间构造自己程序的结构算法。

 1.分析文本文档，首先要成功的打开文本文档。即要用到文件流的输入输出。头文件#include<fstream>和函数fopen（），getc()等

int wenjianopen(FILE *fp)
{
 fp=fopen("yingyu.txt","r");
 if(fp==NULL)
  cout<<"文件打开错误，请检验。"<<endl;
 return 0;
}

2.文件创建以后需要读入文件中的英文单词。在读入过程中如果是单词就录入结构体ciyu[30]中，方便以后进行比较和统计。

struct yingyu
{
 string danci;
 int count;
}ciyu[40],d;

3。文本文档的内容：

My father was a self-taught mandolin player. He was one of the best string instrument players in our town. He could not read music, but if he heard a tune a few times, he could play it. When he was younger, he was a member of a small country music band. They would play at local dances and on a few occasions would play for the local radio station. He often told us how he had auditioned and earned a position in a band that featured Patsy Cline as their lead singer. He told the family that after he was hired he never went back. Dad was a very religious man. He stated that there was a lot of drinking and cursing the day of his audition and he did not want to be around that type of environment.

4.在比较过程中利用选择比较法进行比较：

 for(int p=0;p<N;p++)
 {
  q=p;
  for(int r=p+1;r<N;r++)
   if(ciyu[q].count<ciyu[r].count)
    q=r;
  if(q!=p)
  {
   d.count=ciyu[q].count;
   ciyu[q].count=ciyu[p].count;
   ciyu[p].count=d.count;
   d.danci=ciyu[q].danci;
   ciyu[q].danci=ciyu[p].danci;
   ciyu[p].danci=d.danci;
  }

5.运行结果：