Detrminant of a Matrix n x n - c++

Question

Who can tell me my mistake?
The determinant isn´t correct!
I did a test in a piece of paper and the answer is correct!
I believe that maybe my mistake is in the while, in the line "Matriz[i+1][j] = (Matriz[i+1][j] - (Matriz[fila][j]*(Matriz[i+1][0]/Matriz[fila][fila]))); " but my test is correct.
#include <iostream>
#include <stdio.h>
using namespace std;
class Matriznxm{
private:
int n,m;
float **Matriz;
public:
Matriznxm(int f, int c){
n = f;
m = c;
Matriz = new float *[n];
for (int i=0; i<n; i++){
Matriz[i]=new float [m];
}
for(int i=0; i<n; i++){
for(int j=0; j<m; j++ ){
Matriz[i][j]=0.0;
}
}
}
void llenarMatriz(){
for(int i=0; i<n; i++){
for(int j=0; j<m; j++){
cout << "\nMatriz ["<<i+1<<"]["<<j+1<<"]: ";
cin >> Matriz[i][j];
}
}
}
void mostrarMatriz(){
for(int i=0; i<n; i++){
for(int j=0; j<m; j++){
cout << Matriz[i][j]<< " ";
}
cout << "\n";
}
}
int determinante(){
float det = 1.0;
int fila = 0;
while(fila < n-1){
for(int i=fila; i<n-1; i++){
for(int j=fila; j<m; j++){
Matriz[i+1][j] = (Matriz[i+1][j] - (Matriz[fila][j]*(Matriz[i+1][0]/Matriz[fila][fila])));
}
}
fila++;
}
for (int i=0; i<n; i++){
det= det * Matriz[i][i];
}
return det;
}
};
int main(){
int n,m;
cout<<"\nNumero de Filas y Columnas: ";
cin >> n;
cout << "\n\n\n";
m=n;
Matriznxm m1(n,m);
m1.llenarMatriz();
m1.mostrarMatriz();
cout << "\nEl determinante es: "<< m1.determinante() <<"\n\n";
m1.mostrarMatriz();
return 1;
}

Answer 1

#include <iostream>
using namespace std;
int main()
{
int siz;
cout<< "enter the size of you matrix AxA\nA = ";
cin >>siz;
int mat[siz][siz],rez=0,rezA=1,rezB=1;
for(int i=0;i<siz;i++)
for(int j=0;j<siz;j++)
cin >> mat[i][j];
for(int t=0;t<siz;t++){
for(int i=0;i<siz;i++)
{
rezA = rezA *mat[i][i+t>siz-1?(i+t-siz):i+t];
rezB = rezB *mat[i][siz-t-1-i<0?(2*siz-t-1-i):(siz-t-1-i)];
}
rez = rez + (rezA - rezB);
rezA =rezB = 1;
}
cout <<endl<<"The Determinat is : "<<rez;
return 0;
}