`luc094.c`¶

Problem Statement

Read a text file, delete the words 'a', 'the', 'an' and replace each with a blank space. Write to new file.

Metadata¶

Property	Detail
Author	Amit Dutta amitdutta4255@gmail.com
Date	08 Feb 2026
License	MIT License (See the LICENSE file for details)
Difficulty	Beginner (index: 3 / 10)

Concepts¶

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Pointers
Recursion
Array

Actions¶

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Source Code¶

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

void create_article_file();

int main()
{
    FILE *fp, *ft;
    char word[100];

    create_article_file();

    fp = fopen("articles.txt", "r");
    ft = fopen("clean.txt", "w");

    if (!fp || !ft) exit(1);

    // Basic word-by-word processing using fscanf
    // Note: fscanf skips whitespace, so original spacing formatting 
    // might be lost, but it effectively filters words.

    while (fscanf(fp, "%s", word) != EOF)
    {
        if (strcasecmp(word, "a") == 0 || 
            strcasecmp(word, "an") == 0 || 
            strcasecmp(word, "the") == 0)
        {
            fputc(' ', ft); // Replace with blank
        }
        else
        {
            fprintf(ft, "%s ", word);
        }
    }

    printf("Processed file. Articles removed in 'clean.txt'.\n");

    fclose(fp);
    fclose(ft);
    return 0;
}

void create_article_file()
{
    FILE *f = fopen("articles.txt", "w");
    fprintf(f, "The quick brown fox jumps over a lazy dog. It was an honour.");
    fclose(f);
}

Explanation¶

Explain with AI

Copy the prompt below and paste it into any AI assistant.

    You are explaining a C programming code to a beginner.

    STRICT RULES:

    - Only use the given code. Do NOT assume anything not present.

    - Do NOT add extra examples.

    - Keep explanation clear and short.

    - If something is unclear, say "Not clear from code".

    - Follow the exact format below. Do NOT change headings.

    FORMAT:

    [START]

    ## What it does

    (Explain the overall purpose in 1-2 sentences)

    ## Step-by-step

    (Explain how the code works in steps, simple language)

    ## Key Concepts

    (List concepts like loop, condition, function, etc.)

    ## Notes

    (Mention any limitations, errors, or assumptions)

    [END]

    CODE (luc094.c):

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

    void create_article_file();

    int main()
    {
        FILE *fp, *ft;
        char word[100];

        create_article_file();

        fp = fopen("articles.txt", "r");
        ft = fopen("clean.txt", "w");

        if (!fp || !ft) exit(1);

        // Basic word-by-word processing using fscanf
        // Note: fscanf skips whitespace, so original spacing formatting 
        // might be lost, but it effectively filters words.

        while (fscanf(fp, "%s", word) != EOF)
        {
            if (strcasecmp(word, "a") == 0 || 
                strcasecmp(word, "an") == 0 || 
                strcasecmp(word, "the") == 0)
            {
                fputc(' ', ft); // Replace with blank
            }
            else
            {
                fprintf(ft, "%s ", word);
            }
        }

        printf("Processed file. Articles removed in 'clean.txt'.\n");

        fclose(fp);
        fclose(ft);
        return 0;
    }

    void create_article_file()
    {
        FILE *f = fopen("articles.txt", "w");
        fprintf(f, "The quick brown fox jumps over a lazy dog. It was an honour.");
        fclose(f);
    }

luc094.c¶