`luc095.c`¶

Problem Statement

Write a program that can read a file and display its contents. The file name should be supplied as a command-line argument.

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¶

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Array
Pointers

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Source Code¶

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

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

    /* Check if file name is provided */
    if (argc != 2)
    {
        printf("Usage: %s <filename>\n", argv[0]);
        exit(1);
    }

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

    /* Read and display contents */
    while ((ch = fgetc(fp)) != EOF)
    {
        printf("%c", ch);
    }

    fclose(fp);
    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 (luc095.c):

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

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

        /* Check if file name is provided */
        if (argc != 2)
        {
            printf("Usage: %s <filename>\n", argv[0]);
            exit(1);
        }

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

        /* Read and display contents */
        while ((ch = fgetc(fp)) != EOF)
        {
            printf("%c", ch);
        }

        fclose(fp);
        return 0;
    }

luc095.c¶