`luc101.c`¶

Problem Statement

Decode student information (Year, Stream, Room No) packed into an integer array.

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

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Source Code¶

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

int main()
{
    int data[] = {273, 548, 786, 1096};
    int n = 4, i;
    int val, year, stream_bits, room;

    for (i = 0; i < n; i++)
    {
        val = data[i];

        // Room Number: Rest of the bits (Assuming starting from bit 8)
        room = val >> 8;

        printf("Student %d (Raw: %d):\n", i + 1, val);
        printf("  Room No: %d\n", room);

        // Year: Bits 0-3
        printf("  Year: ");
        if (val & (1 << 0)) printf("1st Year");
        else if (val & (1 << 1)) printf("2nd Year");
        else if (val & (1 << 2)) printf("3rd Year");
        else if (val & (1 << 3)) printf("4th Year");
        else printf("Unknown");
        printf("\n");

        // Stream: Bits 4-7 (Mech, Chem, Elec, CS)
        printf("  Stream: ");
        if (val & (1 << 4)) printf("Mechanical");
        else if (val & (1 << 5)) printf("Chemical");
        else if (val & (1 << 6)) printf("Electronics");
        else if (val & (1 << 7)) printf("CS");
        else printf("Unknown");
        printf("\n\n");
    }

    return 0;
}

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    - 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 (luc101.c):

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

    int main()
    {
        int data[] = {273, 548, 786, 1096};
        int n = 4, i;
        int val, year, stream_bits, room;

        for (i = 0; i < n; i++)
        {
            val = data[i];

            // Room Number: Rest of the bits (Assuming starting from bit 8)
            room = val >> 8;

            printf("Student %d (Raw: %d):\n", i + 1, val);
            printf("  Room No: %d\n", room);

            // Year: Bits 0-3
            printf("  Year: ");
            if (val & (1 << 0)) printf("1st Year");
            else if (val & (1 << 1)) printf("2nd Year");
            else if (val & (1 << 2)) printf("3rd Year");
            else if (val & (1 << 3)) printf("4th Year");
            else printf("Unknown");
            printf("\n");

            // Stream: Bits 4-7 (Mech, Chem, Elec, CS)
            printf("  Stream: ");
            if (val & (1 << 4)) printf("Mechanical");
            else if (val & (1 << 5)) printf("Chemical");
            else if (val & (1 << 6)) printf("Electronics");
            else if (val & (1 << 7)) printf("CS");
            else printf("Unknown");
            printf("\n\n");
        }

        return 0;
    }

luc101.c¶