如何计算文本文件中的段落数 [英] how to count the number of paragraphs in a text file

问题描述

你好我试过这个

Hi i tried like this

int main()
{
        FILE *fp=fopen("200_content.txt ","r");
        int pCount=0;
        char c;
        while ((c=fgetc(fp))!=EOF)
        {
                if(c=='\n'){pCount++;}
                else{continue;}
        }
        printf("%d",pCount);
        return 0;
}

但是我得到了分段错误。任何人都可以帮我这个吗？

But i am getting segmentation fault.Can anyone help me with this?

推荐答案

首先，从文件名中删除空格，然后检查文件是否与可执行文件位于同一文件夹中 - 否则它将无效。

然后，< b>检查你的返回值来自fopen - 因为如果找不到文件，fopen会返回null并且你的代码会失败，如你所见。



然后，看看你的代码吧！你认为这是做什么的：

First, remove the space from your file name, and check the file is in the same folder as the executable - or it won't work.
Then, check your return value from fopen - because if it doesn't find the file, fopen returns null and your code fails, as you have seen.

Then, look at your code! What do you supposed this does:

else{continue;}

这在形式或形式上有用吗？

That is in any way shape or form useful?

一个段落包含两个后续'\ n'，使用一个用于计算两个'\\ n'的变量，像这样，

A paragraph contains two subsequent '\n's, use a variable for counting the two '\n's, like this,

int main()
{
        FILE *fp=fopen("200_content.txt ","r");
        int pCount=0;
        char c;
        int newln_cnt=0;
        while ((c=fgetc(fp))!=EOF)
        { 
                if(c=='\n')
                {
                  newln_cnt++;
                  if(newln_cnt==2)
                  {

                     pCount++;
                     newln_cnt=0;
                  }
                }
                else{continue;} 
        }
        printf("%d",pCount);
        return 0;
}

对于初学者，我假设您将新行视为新段落。即



这是第1行。

这是第2行。



有2个段落。



你的代码所做的是忽略了在第2行之后有EOF而不是换行符（\ n）的情况。



修复此问题的一种方法是使用额外的char变量。

For starters, I assume that you consider a new line to be a new paragraph. i.e.

This is line 1.
This is line 2.

has 2 paragraphs.

What your code does is neglect the case where there is an EOF and not a newline character (\n) after This is line 2.

One way to fix this is to use an extra char variable.

int main()
{
        FILE *fp=fopen("200_content.txt ","r");
        int pCount=0;
        char c; // char that checks
        char last_c; //record of the last character read in the loop
        while ((c=fgetc(fp))!=EOF)
        {
                if(c=='\n'){pCount++;}
                last_c = c;
                else{continue;} //this line is redundant. You can remove it 
        }
        if (last_c != '\n') pCount++; //if EOF at the end of line and not '\n'

        printf("%d",pCount);
        return 0;
}

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