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luc109.c

Problem Statement

Receive an 8-bit number and set its odd bits to 1.

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)

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Source Code

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

int main()
{
    unsigned char num, res;

    printf("Enter an 8-bit number: ");
    scanf("%hhu", &num);

    // Odd bits usually refer to positions 1, 3, 5, 7.
    // Mask: 1010 1010 (binary) = 0xAA
    // OR operation sets bits to 1.

    res = num | 0xAA;

    printf("Original: 0x%02X\n", num);
    printf("Result:   0x%02X\n", res);

    return 0;
}

Explanation

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    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 (luc109.c):

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

    int main()
    {
        unsigned char num, res;

        printf("Enter an 8-bit number: ");
        scanf("%hhu", &num);

        // Odd bits usually refer to positions 1, 3, 5, 7.
        // Mask: 1010 1010 (binary) = 0xAA
        // OR operation sets bits to 1.

        res = num | 0xAA;

        printf("Original: 0x%02X\n", num);
        printf("Result:   0x%02X\n", res);

        return 0;
    }