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lucproblem010.c

Problem Statement

Write a program to generate all combination of 1, 2 and 3 using for loop.

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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  • Sorting (possible)
  • Iteration

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Source Code

#include <stdio.h>

int main()
{
    printf("Combination of 1, 2 and 3 :");

    // for 1 digit numbers
    for (int i = 1; i <= 3; i++)
    {
        printf("  %d", i);
    }

    // for 2 digit numbers
    for (int i = 1; i <= 3; i++)
    {
        for (int j = 1; j <= 3; j++)
        {
            printf("  %d%d", i, j);
        }
    }

    // for 3 digit numbers
    for (int i = 1; i <= 3; i++)
    {
        for (int j = 1; j <= 3; j++)
        {
            for (int k = 1; k <= 3; k++)
            {
                printf("  %d%d%d", i, j, k);
            }
        }
    }

    // for 4 digit numbers
    for (int i = 1; i <= 3; i++)
    {
        for (int j = 1; j <= 3; j++)
        {
            for (int k = 1; k <= 3; k++)
            {
                for (int l = 1; l <= 3; l++)
                {
                    printf("  %d%d%d%d", i, j, k, l);
                }
            }
        }
    }

    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 (lucproblem010.c):

    #include <stdio.h>

    int main()
    {
        printf("Combination of 1, 2 and 3 :");

        // for 1 digit numbers
        for (int i = 1; i <= 3; i++)
        {
            printf("  %d", i);
        }

        // for 2 digit numbers
        for (int i = 1; i <= 3; i++)
        {
            for (int j = 1; j <= 3; j++)
            {
                printf("  %d%d", i, j);
            }
        }

        // for 3 digit numbers
        for (int i = 1; i <= 3; i++)
        {
            for (int j = 1; j <= 3; j++)
            {
                for (int k = 1; k <= 3; k++)
                {
                    printf("  %d%d%d", i, j, k);
                }
            }
        }

        // for 4 digit numbers
        for (int i = 1; i <= 3; i++)
        {
            for (int j = 1; j <= 3; j++)
            {
                for (int k = 1; k <= 3; k++)
                {
                    for (int l = 1; l <= 3; l++)
                    {
                        printf("  %d%d%d%d", i, j, k, l);
                    }
                }
            }
        }

        return 0;
    }