c - 如何计算文本文件中相互重叠的单词

Question

我正在用户选择查找的 txt 文件中搜索 特定的单词和符号 (&) ，已经由 图书馆。我为每个单词做了一个单独的函数(因为我 真的不知道如何组合它们)但我无法弄清楚 执行/同时搜索功能。

我已经为每个单词做了一个单独的功能，但我无法弄清楚 do/while 搜索功能本质上是我的问题 具有组合功能和搜索 2 部分的功能 只字不提。我想数 while 和 do/while 分开。

 #include < stdio.h >
#include < stdlib.h >
#include < string.h >
#define BUFFER_SIZE 1000

/* Function declarations. How do I combine them all? */
int CountOccurrences ( FILE *fptr, char *word );

int main()
{
    FILE *fptr; // name

    SetConsoleCP (1251); // so that it runs with my language 
    SetConsoleOutputCP (1251);

    char path[100];

    // The 4 words and the symbol I am searching for.

    char word[]= "while";
    char word1[]= "for";
    char word2[]= "&";
    char word3[]= "do{ }while";

    int wCount; // Variable to get the value of the function.
    int wCount1; // same 
    int wCount2; // same 
    int wCount3; // same 

    /* Input file path */
    printf ( "Enter file path: " );
    scanf ( "%s", path );

    /* Try to open file */
    fptr = fopen ( path, "r" );

    /* Exit if file not opened successfully */
    if ( fptr == NULL )
    {
        printf ( "Unable to open file.\n" ); //Error msg
        printf ( "Please check you have read/write previleges.\n" ); //Help msg

        exit(EXIT_FAILURE); //end
    }

     // Call function to count all occurrence of word
    wCount = CountOccurrences ( fptr, word );
     //rewind so I can use It again

    rewind ( fptr );
    printf ( "'%s' is found %d times in file.\n", word, wCount );

    //the method is the same for all the 4 functions        
    fclose ( fptr ); //close file

    return 0;  /* How can I search for overlapping words in a txt file with the goal to differentiate from each other in a txt file */ 
}

 //Returns total occurrences of a word in given file.
 int CountOccurrences(FILE *fptr, char *word) {

    char str [BUFFER_SIZE]; //The other functions are the same
    char *pos;

    int index, count;

    //make a variable to count the amount of occurrences 

    count = 0;

    // Read line from file till end of file.
    while ((fgets(str, BUFFER_SIZE, fptr)) != NULL)
    {
        index = 0; //to store the word

        // Find next occurrence of word in str
        while ((pos = strstr(str + index, word)) != NULL)
        {
            index = (pos - str) + 1;

             // Index of word in str is
             // Memory address of pos - memory
             // address of str.

            count++; // sums every time for a specific word
        }
    }
    return count; 
}

Answer 1

在下面的 while 循环中的 CountOccurances() 函数中，对 word1、word2、word3 和 word4 分别使用 strcmp()，可以找到单词。

  while ((pos = strstr(str + index, word))

进一步在 fgets() 函数中，换行符将在单词读取的末尾读取，这可能导致 strcmp() 失败。可以通过让单词的最后一个字符减1为null来处理