`luc067.c`¶

Problem Statement

Write a program to multiply any two 3 x 3 matrices.

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: 2 / 10)

Concepts¶

Beta Feature

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Array
Sorting (possible)
Iteration

Actions¶

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Source Code¶

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

int main()
{
    int mat1[3][3], mat2[3][3], res[3][3];
    int i, j, k;

    printf("Enter elements of first 3x3 matrix:\n");
    for (i = 0; i < 3; i++)
        for (j = 0; j < 3; j++)
            scanf("%d", &mat1[i][j]);

    printf("Enter elements of second 3x3 matrix:\n");
    for (i = 0; i < 3; i++)
        for (j = 0; j < 3; j++)
            scanf("%d", &mat2[i][j]);

    // Initialize result matrix to 0
    for (i = 0; i < 3; i++)
        for (j = 0; j < 3; j++)
            res[i][j] = 0;

    // Multiplication Logic
    for (i = 0; i < 3; i++)
    {
        for (j = 0; j < 3; j++)
        {
            for (k = 0; k < 3; k++)
            {
                res[i][j] += mat1[i][k] * mat2[k][j];
            }
        }
    }

    printf("\nResult of Multiplication:\n");
    for (i = 0; i < 3; i++)
    {
        for (j = 0; j < 3; j++)
        {
            printf("%4d ", res[i][j]);
        }
        printf("\n");
    }

    return 0;
}

Explanation¶

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    - 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 (luc067.c):

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

    int main()
    {
        int mat1[3][3], mat2[3][3], res[3][3];
        int i, j, k;

        printf("Enter elements of first 3x3 matrix:\n");
        for (i = 0; i < 3; i++)
            for (j = 0; j < 3; j++)
                scanf("%d", &mat1[i][j]);

        printf("Enter elements of second 3x3 matrix:\n");
        for (i = 0; i < 3; i++)
            for (j = 0; j < 3; j++)
                scanf("%d", &mat2[i][j]);

        // Initialize result matrix to 0
        for (i = 0; i < 3; i++)
            for (j = 0; j < 3; j++)
                res[i][j] = 0;

        // Multiplication Logic
        for (i = 0; i < 3; i++)
        {
            for (j = 0; j < 3; j++)
            {
                for (k = 0; k < 3; k++)
                {
                    res[i][j] += mat1[i][k] * mat2[k][j];
                }
            }
        }

        printf("\nResult of Multiplication:\n");
        for (i = 0; i < 3; i++)
        {
            for (j = 0; j < 3; j++)
            {
                printf("%4d ", res[i][j]);
            }
            printf("\n");
        }

        return 0;
    }

luc067.c¶