`P030.c`¶

Problem Statement

Display the first 15 terms of the series.

Metadata¶

Property	Detail
Author	Amit Dutta amitdutta4255@gmail.com
Date	12 Dec 2025
License	MIT License (See the LICENSE file for details)
Difficulty	Beginner (index: 1 / 10)

Concepts¶

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Pointers
Iteration

Actions¶

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Source Code¶

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

int main()
{
    int i, r;

    // 3, 6, 9, 12, ...
    {
        i = 3, r = 0;
        printf("Series 1 (3, 6, 9, 12, ...) :");
        while (i <= 15)
        {
            r = r + 3;
            printf("  %d", r);
            i++;
        }
    }

    // 1, 4, 9, 16, ...
    {
        i = 1;
        printf("\nSeries 2 (1, 4, 9, 16, ...) :");
        while (i <= 15)
        {
            printf("  %d", i * i);
            i++;
        }
    }

    // 4, 8, 16, 32, ...
    {
        i = 1, r = 2;
        printf("\nSeries 3 (4, 8, 16, 32, ...) :");
        while (i <= 15)
        {
            r = r * 2;
            printf("  %d", r);
            i++;
        }
    }

    // 0, 7, 26, ...
    {
        i = 1, r;
        printf("\nSeries 4 (0, 7, 26, ...) :");
        while (i <= 15)
        {
            r = (int)pow(i, 3) - 1;
            printf("  %d", r);
            i++;
        }
    }

    return 0;
}

Explanation¶

Explain with AI

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 (P030.c):

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

    int main()
    {
        int i, r;

        // 3, 6, 9, 12, ...
        {
            i = 3, r = 0;
            printf("Series 1 (3, 6, 9, 12, ...) :");
            while (i <= 15)
            {
                r = r + 3;
                printf("  %d", r);
                i++;
            }
        }

        // 1, 4, 9, 16, ...
        {
            i = 1;
            printf("\nSeries 2 (1, 4, 9, 16, ...) :");
            while (i <= 15)
            {
                printf("  %d", i * i);
                i++;
            }
        }

        // 4, 8, 16, 32, ...
        {
            i = 1, r = 2;
            printf("\nSeries 3 (4, 8, 16, 32, ...) :");
            while (i <= 15)
            {
                r = r * 2;
                printf("  %d", r);
                i++;
            }
        }

        // 0, 7, 26, ...
        {
            i = 1, r;
            printf("\nSeries 4 (0, 7, 26, ...) :");
            while (i <= 15)
            {
                r = (int)pow(i, 3) - 1;
                printf("  %d", r);
                i++;
            }
        }

        return 0;
    }

P030.c¶