`luc096.c`¶

Problem Statement

Write a program that can copy the contents of one file to another. The source and target filenames should be supplied as command-line arguments.

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: 1 / 10)

Concepts¶

Beta Feature

This concept detection system is still in beta and may occasionally show incorrect or incomplete results.

Array
Pointers
Iteration

Actions¶

Raw View on GitHub

You can print or save this file by opening Raw and using your browser.

Source Code¶

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

int main(int argc, char *argv[])
{
    FILE *fs, *ft;
    char ch;

    /* Check for correct number of arguments */
    if (argc != 3)
    {
        printf("Usage: %s <source_file> <target_file>\n", argv[0]);
        exit(1);
    }

    fs = fopen(argv[1], "r");
    if (fs == NULL)
    {
        printf("Error: Cannot open source file '%s'\n", argv[1]);
        exit(2);
    }

    ft = fopen(argv[2], "w");
    if (ft == NULL)
    {
        printf("Error: Cannot create target file '%s'\n", argv[2]);
        fclose(fs);
        exit(3);
    }

    /* Copy contents */
    while ((ch = fgetc(fs)) != EOF)
    {
        fputc(ch, ft);
    }

    printf("File copied successfully.\n");

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

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 (luc096.c):

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

    int main(int argc, char *argv[])
    {
        FILE *fs, *ft;
        char ch;

        /* Check for correct number of arguments */
        if (argc != 3)
        {
            printf("Usage: %s <source_file> <target_file>\n", argv[0]);
            exit(1);
        }

        fs = fopen(argv[1], "r");
        if (fs == NULL)
        {
            printf("Error: Cannot open source file '%s'\n", argv[1]);
            exit(2);
        }

        ft = fopen(argv[2], "w");
        if (ft == NULL)
        {
            printf("Error: Cannot create target file '%s'\n", argv[2]);
            fclose(fs);
            exit(3);
        }

        /* Copy contents */
        while ((ch = fgetc(fs)) != EOF)
        {
            fputc(ch, ft);
        }

        printf("File copied successfully.\n");

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

luc096.c¶