`luc053.c`¶

Problem Statement

Write macro definitions for: Mean, Absolute value, Uppercase to Lowercase, Biggest of three.

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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Sorting (possible)
Iteration

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Source Code¶

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

#define MEAN(x, y) ((x + y) / 2.0)
#define ABS(x) ((x) < 0 ? -(x) : (x))
#define TO_LOWER(x) ((x) >= 'A' && (x) <= 'Z' ? (x) + 32 : (x))
#define MAX(x, y, z) ((x) > (y) ? ((x) > (z) ? (x) : (z)) : ((y) > (z) ? (y) : (z)))

int main()
{
    int a, b, c, num;
    char ch;

    printf("Enter two numbers for Mean: ");
    scanf("%d %d", &a, &b);
    printf("Mean: %.2f\n\n", MEAN(a, b));

    printf("Enter a number for Absolute value: ");
    scanf("%d", &num);
    printf("Absolute: %d\n\n", ABS(num));

    printf("Enter an uppercase character: ");
    scanf(" %c", &ch);
    printf("Lowercase: %c\n\n", TO_LOWER(ch));

    printf("Enter three numbers: ");
    scanf("%d %d %d", &a, &b, &c);
    printf("Biggest: %d\n", MAX(a, b, c));

    return 0;
}

Explanation¶

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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 (luc053.c):

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

    #define MEAN(x, y) ((x + y) / 2.0)
    #define ABS(x) ((x) < 0 ? -(x) : (x))
    #define TO_LOWER(x) ((x) >= 'A' && (x) <= 'Z' ? (x) + 32 : (x))
    #define MAX(x, y, z) ((x) > (y) ? ((x) > (z) ? (x) : (z)) : ((y) > (z) ? (y) : (z)))

    int main()
    {
        int a, b, c, num;
        char ch;

        printf("Enter two numbers for Mean: ");
        scanf("%d %d", &a, &b);
        printf("Mean: %.2f\n\n", MEAN(a, b));

        printf("Enter a number for Absolute value: ");
        scanf("%d", &num);
        printf("Absolute: %d\n\n", ABS(num));

        printf("Enter an uppercase character: ");
        scanf(" %c", &ch);
        printf("Lowercase: %c\n\n", TO_LOWER(ch));

        printf("Enter three numbers: ");
        scanf("%d %d %d", &a, &b, &c);
        printf("Biggest: %d\n", MAX(a, b, c));

        return 0;
    }

luc053.c¶