multiply two matrix using function

 #include <stdio.h>

#define ROWS 3

#define COLS 3

void matrixMultiply(int mat1[ROWS][COLS], int mat2[ROWS][COLS], int result[ROWS][COLS]) {

    int i, j, k;

    // Multiplying matrices

    for (i = 0; i < ROWS; i++) {

        for (j = 0; j < COLS; j++) {

            result[i][j] = 0;

            for (k = 0; k < ROWS; k++) {

                result[i][j] += mat1[i][k] * mat2[k][j];

            }

        }

    }

}

void displayMatrix(int mat[ROWS][COLS]) {

    int i, j;

    // Displaying matrix

    for (i = 0; i < ROWS; i++) {

        for (j = 0; j < COLS; j++) {

            printf("%d\t", mat[i][j]);

        }

        printf("\n");

    }

}

int main() {

    int mat1[ROWS][COLS] = {{1, 2, 3},

                            {4, 5, 6},

                            {7, 8, 9}};

    int mat2[ROWS][COLS] = {{9, 8, 7},

                            {6, 5, 4},

                            {3, 2, 1}};

    int result[ROWS][COLS];

    // Multiplying matrices

    matrixMultiply(mat1, mat2, result);

    // Displaying matrices

    printf("Matrix 1:\n");

    displayMatrix(mat1);

    printf("\nMatrix 2:\n");

    displayMatrix(mat2);

    printf("\nResultant Matrix:\n");

    displayMatrix(result);

    return 0;

}

1. Define Matrix Sizes: The matrices are defined with a constant number of rows and columns. In this example, both matrices are 3x3, but you can adjust the ROWS and COLS macros to change their sizes.

2. Matrix Multiplication Function (matrixMultiply): This function takes three parameters: two matrices (mat1 and mat2) to be multiplied and a third matrix (result) where the product will be stored. It uses nested loops to iterate over each element of the result matrix and calculate its value by performing the dot product of the corresponding row in mat1 and column in mat2 Display Matrix Function (displayMatrix): This function takes a matrix as input and displays its contents row by row, separated by tabs.

3. Main Function (main): In the main function, two matrices (mat1 and mat2) are initialized with sample values. Then, the matrixMultiply function is called to compute the product of these matrices, and the result is stored in the result matrix. Finally, the contents of all three matrices are displayed using the displayMatrix function.