Многофайловая программа Code Blocks

#include <iostream>
#include <cmath>
#include "matricies_mult.h"
 
 
 
using namespace std;
int main ()
 
 
{
double A[][MAXSIZE]={
{1,6,7},
{2,5,8},
{3,4,9},
{2,3,5}};
double B [][MAXSIZE]={
{1,6,7},
{2,5,8},
{3,4,9},
{2,3,5}};
cout <<double C[][MAXSIZE] << endl;
 
 
 
 
return 0;}

#include <iostream>
#include <cmath>
 
void matricies_mult(double A[][MAXSIZE],double B[][MAXSIZE],double C[][MAXSIZE],int row,int column)
{float s;
for(i=0; i<row; i++) {
for(l=0; l<column; l++) {
s = 0;
for(j=0; j<column; j++) {
s += a[i][j]*b[j][l];
}
c[i][l] = s;
}
}
}

#ifndef MATRICIES_MULT_H_INCLUDED
#define MATRICIES_MULT_H_INCLUDED
void matricies_mult(double A[][MAXSIZE],double B[][MAXSIZE],double C[][MAXSIZE],int row,int column)
 
 
#endif // MATRICIES_MULT_H_INCLUDED

#ifndef MATRICES_MULT_H_INCLUDED
#define MATRICES_MULT_H_INCLUDED
 
const int ROW = 4;
const int COL = 3;
 
void matrices_mult(double firstMatrix[][COL], double secondMatrix[][COL], double resultMatrix[][COL]);
void show_matrix(double matrix[][COL]);
 
#endif // MATRICES_MULT_H_INCLUDED

#include "matrices_mult.h"
#include <iostream>
 
void matrices_mult(double firstMatrix[][COL], double secondMatrix[][COL], double resultMatrix[][COL])
{
    for (int i = 0; i < ROW; ++i)
        for (int j = 0; j < COL; ++j)
            resultMatrix[i][j] = firstMatrix[i][j] * secondMatrix[i][j];
}
 
void show_matrix(double matrix[][COL])
{
    for (int i = 0; i < ROW; ++i)
    {
        for (int j = 0; j < COL; ++j)
            std::cout <<  matrix[i][j] << " ";
        std::cout << "\n";
    }
}

#include "matrices_mult.h"  //includes constants ROW and COL
 
int main()
{
    using namespace std;
 
    double firstMatrix[ROW][COL] =
    {
        {1, 6, 7},
        {2, 5, 8},
        {3, 4, 9},
        {2, 3, 5}
    };
 
    double secondMatrix[ROW][COL] =
    {
        {1, 6, 7},
        {2, 5, 8},
        {3, 4, 9},
        {2, 3, 5}
    };
 
    double resultMatrix[ROW][COL] =
    {
        {0, 0, 0},
        {0, 0, 0},
        {0, 0, 0},
        {0, 0, 0}
    };
 
    matrices_mult(firstMatrix, secondMatrix, resultMatrix);
 
    show_matrix(resultMatrix);
 
    return 0;
}