Convert C++ code to Java

[napoleon]

I have to convert below C++ code to Java. Everything is simple, except the &M reference from C++! How can I use in Java?

#include <iostream>
using namespace std;

const int MAX = 100;
void MinCoinGreedy(int n, int c[], int m, int nc[], int &M);

int main() {
  int n, c[MAX], m, nc[MAX], M;

  cout << "Amount: ";  cin >> n;
  cout << "No. coin: ";  cin >> m;
  cout << "\nCoins \n";

  for(int i = 0; i < m; i++) {
    cout << "c[" << i << "] : ";
    cin >> c[i];
    nc[i] = 0;
  }

  MinCoinGreedy(n, c, m, nc, M);

  cout << endl;
  for(int i = 0; i < m; i++)
    cout << c[i] << ' ' << nc[i] << endl;

  cout << "\n\nM = " << M << endl;

  return 0;
}

void MinCoinGreedy(int n, int c[], int m, int nc[], int &M) {
  for(int i = m-1; i >= 0; i--)
    while(n >= c[i]) {
      nc[i]++;
      n -= c[i];
    }
  M = 0;
  for(int i = 0; i < m; i++)  M += nc[i];
}

[SreerajSarma]

Instead of passing M as (pass by reference), you can pass M
as pass by value

convert the function prototype to

void MinCoinGreedy(int n, int c[], int m, int nc[], int &M);
to
int MinCoinGreedy(int n, int c[], int m, int nc[], int M);

the function can be changed like this

int MinCoinGreedy(int n, int c[], int m, int nc[], int M) {
  for(int i = m-1; i >= 0; i--)
    while(n >= c[i]) {
      nc[i]++;
      n -= c[i];
    }
  M = 0;
  for(int i = 0; i < m; i++)  M += nc[i];
  return M; //note the change here
}

you can get the value of M back by coding like this

 int mini=MinCoinGreedy(n, c, m, nc, M);

  cout << endl;
  for(int i = 0; i < m; i++)
    cout << c[i] << ' ' << nc[i] << endl;

  cout << "\n\nM = " << mini << endl;

now you can easily convert this to java
there may be other possible ways also but you can consider this

[toadaly]

To pass an intrinsic type into a java method and have it altered in the caller's space, you have to wrap it in a mutable object.

For example:

class IntWrapper {
  int M;
}

Now you can pass an IntWrapper in place of the 'int'. The 'Integer' class won't work, because it's immutable. Of course, side effects are discouraged (which is what is happening in your c++ program). A cleaner approach would be to pass M in as an int, and have your method return the new value of M.