luc101.c

Metadata

• Author — Amit Dutta
• Last updated — 08 Feb 2026
• License — MIT License (See the LICENSE file for details)

Problem Statement

Problem Statement

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

Source Code

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#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;
}