// test_combinations.java  extra stuff in vecis is not combinationsd 
class test_combinations
{
  test_combinations()
  {
    int veci[] = {1,2,3,4,5}; // indices, in and out of combination
    double vecd[] = {1.0, 2.0, 3.0, 4.0};
    int vecdi[] = {0,1,2,3}; // indices, in and out of combination
    char vecc[] = {'a', 'b', 'c', 'd', 'e'};
    String vecs = "abcd";
    int vcomb[] = new int[6]; // only use 'm'
    double vdcomb[] = new double[4]; // vecd combinations
    boolean if_last = false;
    int n, m;
    combinations C; // instantiate class
    
    System.out.println("test_combinations.java running \n");
    n = 3;
    m = 2;
    System.out.println("Combinations, "+n+" integers taken "+m+" at a time");
    System.out.println("given "+veci[0]+" "+veci[1]+" "+veci[2]);
    C = new combinations(n,m);
    if_last = false;
    while(!if_last)
    {
      if_last=C.comb(veci, vcomb);
      System.out.println(vcomb[0]+" "+vcomb[1]);
    }
    System.out.println(" ");

    n = 4;
    m = 3;
    System.out.println("Combinations, "+n+" doubles taken "+m+" at a time");
    System.out.println("given "+vecd[0]+" "+vecd[1]+" "+vecd[2]+" "+vecd[3]);
    C = new combinations(n,m);
    // reset veci of indices
    for(int i=0; i<n; i++) veci[i] = i;
    if_last = false;
    while(!if_last)
    {
      if_last=C.comb(veci, vcomb); // integer indices
      System.out.println(vecd[vcomb[0]]+" "+vecd[vcomb[1]]+" "+vecd[vcomb[2]]);
    }
    System.out.println(" ");

    n = 5;
    m = 2;
    System.out.println("Combinations,  "+n+" characters taken "+m+
                       " at a time");
    System.out.println("given "+vecc[0]+" "+vecc[1]+" "+vecc[2]+
                       " "+vecc[3]+" "+vecc[4]);
    C = new combinations(n,m);
    // reset veci of indices
    for(int i=0; i<n; i++) veci[i] = i;
    if_last = false;
    while(!if_last)
    {
      if_last=C.comb(veci, vcomb); // integer indices
      System.out.println(vecc[vcomb[0]]+" "+vecc[vcomb[1]]);
    }
    System.out.println(" ");

    n = 5;
    System.out.println("All combination of "+n+" things");
    for(int i=0; i<n; i++) veci[i] = i+1;
    System.out.println("given things: "+veci[0]+" "+veci[1]+" "+veci[2]+
                       " "+veci[3]+" "+veci[4]);
    for(int mm=1; mm<=n; mm++)
    {
      C = new combinations(n,mm);
      // reset veci to items
      for(int i=0; i<n; i++) veci[i] = i+1;
      if_last = false;
      while(!if_last)
      {
        if_last=C.comb(veci, vcomb); // integer indices
        for(int i=0; i<mm; i++) System.out.print(vcomb[i]+" ");
        System.out.println(" ");
      }
    }
    System.out.println(" ");

    n = 4; // using vecd
    for(int i=0; i<n; i++) veci[i] = i;
    System.out.println("given things: "+vecd[0]+" "+vecd[1]+" "+vecd[2]+
                       " "+vecd[3]);
    for(int mm=1; mm<=n; mm++)
    {
      C = new combinations(n,mm);
      System.out.println("combinations(n="+n+",mm="+mm+")");
      // reset vecdi to items
      for(int i=0; i<n; i++) vecdi[i] = i; // must be integer
      if_last = false;
      while(!if_last)
      {
        if_last=C.comb(vecdi, vcomb); // indices of vecd
	for(int k=0; k<mm; k++) System.out.println("vcomb["+k+"]="+vcomb[k]);
	for(int k=0; k<mm; k++) System.out.println(vecd[vcomb[k]]);
        System.out.println(" ");
      }
    }
    System.out.println(" ");
    
    System.out.println("test_combinations.java finished");
  } // end test_combinations

  static public void main(String[] args)
  {
    new test_combinations();
  } // end main
} // end test_combinations.java