`luc029.c`¶

Problem Statement

Write a program to print out all Armstrong numbers between 100 and 500. If sum of cubes of each digit of the number is equal to the number itself, then the number is called an Armstrong number. For example, 153 = (1 * 1 * 1) + (5 * 5 * 5) + (3 * 3 * 3)

Metadata¶

Property	Detail
Author	Amit Dutta (amitdutta4255@gmail.com)
License	MIT
Difficulty	Beginner (index: 1 / 10)

Concepts¶

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Recursion
Iteration

Actions¶

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Source Code¶

#include <stdio.h>
#include <math.h>
int main()
{
    int num = 100, temp1, temp2, res;
    printf("Armstrong numbers between 100 and 500 :");
    while (num <= 500)
    {
        temp1 = num;
        res = 0;
        while (temp1 != 0)
        {
            temp2 = temp1 % 10;
            res = res + pow(temp2, 3);
            temp1 = temp1 / 10;
        }
        if (num == res)
            printf("  %d", num);
        num++;
    }
    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 (luc029.c):

    #include <stdio.h>
    #include <math.h>
    int main()
    {
        int num = 100, temp1, temp2, res;
        printf("Armstrong numbers between 100 and 500 :");
        while (num <= 500)
        {
            temp1 = num;
            res = 0;
            while (temp1 != 0)
            {
                temp2 = temp1 % 10;
                res = res + pow(temp2, 3);
                temp1 = temp1 / 10;
            }
            if (num == res)
                printf("  %d", num);
            num++;
        }
        return 0;
    }

luc029.c¶