Thread: inverse matrix not printing values properly

Hello, I have this code that creates a random matrix and then calculates the inverse of it. Everything seems to work, but when I check if the inverse matrix is correct, I see that the order and some values are wrong, is anyone able to find the mistake?

Code:

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
void inverse(int r, int c, int* matrix[]);
void vectorb(int r);


int main()
{
    srand(time(NULL));
    int r;
    int c;
    printf("define the size of the matrix\n number of rows\n");
    scanf_s("%d", &r);
    printf("number of columns\n");
    scanf_s("%d", &c);
    int **matrix = (int**)malloc(r * sizeof(*matrix));
    for (int i = 0; i < r; i++)
    {
        matrix[i] = (int*)malloc(c * sizeof(*matrix[r]));
    }


    for (int i = 0; i < r; ++i)
    {
        for (int j = 0; j < c; ++j)
        {
            matrix[i][j] = rand() % 21 - 10;
            printf("%d     ", matrix[i][j]);
            
        
        }
        
        printf("\n");
        
    }
    inverse(r, c, matrix);
    
}


    
void inverse(int r, int c, int* matrix[])
{


    double determinant = 0;
    for (int i = 0; i<r; i++)
        determinant = determinant + (matrix[0][i] * (matrix[1][(i + 1) % r] * matrix[2][(i + 2) % r] - matrix[1][(i + 2) % r] * matrix[2][(i + 1) % r]));

    printf("\nInverse of matrix is: \n\n");
    for (int i = 0; i<r; i++){
        for (int j = 0; j<r; j++)

            printf("%.2f\t", (((matrix[(i + 1) % r][(j + 1) % r] * matrix[(i + 2) % r][(j + 2) % r]) - (matrix[(i + 1) % r][(j + 2) % r] * matrix[(i + 2) % r][(j + 1) % r])) / determinant));
        printf("\n");

    }

}

Thanks in advance

solved