Matrix Programming with C++

I have this Program in C++ that multiplies a Matrix by a vector. I can get it to work if i want to enter the elements of the matrix each time i run the program. But i dont want that. I want to define the elements of the matrix permanently in the code. So i dont have to enter it each time i test run the code. How can i do this?


Thank You !

Here is the code...

#include <iostream>
using namespace std;
#define MAX 5

void mulmatvec(int m, int n, double a[MAX][MAX], double x[MAX], double b[MAX]){
  int i,j;

  for(i = 0; i < m; i++){
    b[i] = 0.;
    for(j = 0; j < n; j++)
      b[i] += a[i][j]*x[j];
  }
  return;
}

int main(){
  int i,j,m,n;
  double a[MAX][MAX], x[MAX], b[MAX];

  cout << "Enter the number of rows in the matrix \n";
  cin >> m;
  cout << "Enter the number of columns in the matrix \n";
  cin >> n;

  cout << "Enter the matrix by rows\n";
  for(i = 0; i < m; i++)
    for(j = 0; j < n; j++)
      cin >> a[i][j];

  cout << "Enter the vector\n";
  for(j = 0; j < n; j++)
    cin >> x[j];

  mulmatvec(m,n,a,x,b);

  cout << "\nA*x = \n";
  for(i = 0; i < m; i++)
    cout << b[i] << "\n";
}