C语言求助：.txt文件单词拆分、含指定字符单词提取及代码排查

Got it, let's first break down the issues in your current code that are causing those weird symbols and incorrect behavior:

• Incorrect file opening check: The line if(read=fopen("slovnik_en.txt","r")==NULL) has operator precedence problems. The == runs before =, so you're assigning the comparison result (0 or 1) to read instead of the actual file pointer. You need parentheses around the assignment: if( (read = fopen("slovnik_en.txt", "r")) == NULL ).
• Wrong array type: You declared char *words[101][101]; (a 2D array of character pointers) but tried to store single characters directly. You should use a 2D array of chars: char words[101][101]; instead.
• Reading characters instead of words: Using fscanf(read,"%c",&words[i][j]) reads every single character—including spaces, newlines, and tabs—so you're not splitting words at all. The %s format specifier in fscanf automatically reads whole words by skipping whitespace.
• Printing empty characters: When you initialize words[i][j] = 0 and immediately print it, you're outputting the null character, which shows up as a weird symbol in the console.

Here's the corrected code that meets your task requirements: it reads all words from the file, takes a character input from the console, and outputs every word containing that character:

#include <stdio.h>
#include <string.h>

int main() {
    FILE *file = fopen("slovnik_en.txt", "r");
    if (file == NULL) {
        printf("ERROR: Could not open the file.\n");
        return 1;
    }

    // Store up to 1000 words (adjust the size if your file has more words)
    char words[1000][101];
    int word_count = 0;

    // Read all words from the file automatically splitting on whitespace
    while (fscanf(file, "%s", words[word_count]) == 1 && word_count < 999) {
        word_count++;
    }
    fclose(file);

    // Get the target character from user input
    char target;
    printf("Enter a character to filter words: ");
    scanf(" %c", &target); // The leading space skips leftover whitespace (like newlines)

    // Print all words that contain the target character
    printf("\nWords containing '%c':\n", target);
    for (int i = 0; i < word_count; i++) {
        // strchr checks if the character exists in the word
        if (strchr(words[i], target) != NULL) {
            printf("- %s\n", words[i]);
        }
    }

    return 0;
}

Quick breakdown of how this works: #

• Reading words: fscanf(file, "%s", words[word_count]) reads each word until it hits whitespace (space, newline, etc.), which is exactly how you split words from the text file.
• Filtering words: The strchr standard library function checks if the target character exists in a word. It returns a pointer to the first occurrence of the character, or NULL if it's not found—perfect for our filtering logic.
• Proper file handling: We close the file after reading to free system resources, and add a clear error message if the file can't be opened.
• Clean user input: The scanf(" %c", &target) includes a leading space to skip any leftover whitespace (like if the user pressed enter accidentally), ensuring we capture the intended character correctly.

Just compile and run this code, make sure slovnik_en.txt is in the same directory as your executable, and it should work exactly as you need.

内容的提问来源于stack exchange，提问作者Danil