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

typedef struct {
    int   n;
    int **m;
} Matrix;

Matrix MatNew(int n, int a, int l)
{
    Matrix mat = {
        n,
        (int **) malloc(n * sizeof(int *)),
    };

    for(int i = n; i--; )
    {
        mat.m[i] = (int *) malloc(n * sizeof(int));

        for(int j = n; j--; )
            mat.m[i][j] = a > 0 ? rand() % a + l : 0;
    }

    return mat;
}

void MatFree(Matrix *mat)
{
    for(int i = mat->n; i--; )
        free(mat->m[i]);

    free(mat->m);
}

void MatPrint(Matrix *mat, int t)
{
    for(int i = 0; i < mat->n; ++i)
    {
        for(int j = 0; j < mat->n; ++j)
            printf("%*d", t, mat->m[i][j]);

        puts("");
    }
}

int MatZerosNum(Matrix *mat)
{
    int z = 0;

    for(int i = mat->n; i--; )
        for(int j = mat->n; j--; )
            z += !mat->m[i][j];

    return z;
}

int MatMainMax(Matrix *mat)
{
    int max = mat->m[0][0];

    for(int i = mat->n; i-- > 1; )
        if(mat->m[i][i] > max)
            max = mat->m[i][i];

    return max;
}

int MatSideMax(Matrix *mat)
{
    int n1  = mat->n - 1;
    int max = mat->m[0][n1];

    for(int i = mat->n; i-- > 1; )
        if(mat->m[i][n1 - i] > max)
            max = mat->m[i][n1 - i];

    return max;
}

int main(void)
{
    Matrix matrix = MatNew(10, 51, -25);

    printf("Matrix:\n\n");

    MatPrint(&matrix, 5);

    puts("");
    printf("Zeros             = %d\n", MatZerosNum(&matrix));
    printf("Main diagonal max = %d\n", MatMainMax(&matrix));
    printf("Side diagonal max = %d\n", MatSideMax(&matrix));

    MatFree(&matrix);

    return 0;
}