//-------------------------------------------------
//
// Examples of combinations of strings and arrays, and
// functions that handle both.
//
// Simon Parsons
// November 12th 2008
//
//-------------------------------------------------

// Include C++ library definitions


#include <iostream> // For input and output
#include <string>   // To handle strings

using namespace std;

// Function headers

int  totalLength(string s1, string s2); // Takes strings as arguments and
                                        // returns an integer.

string oddOne(int n);                   // Takes an integer as an arguement
                                        // and returns a string.

void printArray(int a[], int size);     // Takes an array as an argument

int  doubleArray(int a[], int size);    // Takes an array as an argument
                                        // and returns an int

int main()
{

  int i, j, num, length;

  // Variable definitions

  string dna1 = "ggtataccggaatatagg";   // Two strings
  string dna2 = "ttggaagg";
  string str;
  
  string genes[3] = {"tatagg", "gagattc", "cgcgttat"};

  int grid[2][3]  = {{0, 1, 2}, {7, 8, 9}};
  int list[5]     = {2, 4, 6, 8, 34};
  int list2[6]   = {12, 43, 66, 32, 11, 44};

  // Some of the variables still need to be initialised.

  num = rand() % 25;
  length = 0;
  str = "";

  // Call totalLength

  length = totalLength(dna1, dna2);

  cout << "The DNA snips dna1 and dna2  are " << length << " bases long";
  cout << endl << endl;

  // Call oddOne

  str = oddOne(num);

  cout << num << " is " << str << endl << endl;
  
  // Print out the length of each element of genes

  cout << "The three snips in 'genes' are the following lengths: " << endl;

  for(i = 0; i < 3; ++i){
    cout << genes[i].length() << endl;
  }

  cout << endl;

  // Now print out the values in grid plus 3

  cout << "The values in grid are" << endl;

  for(i = 0; i < 2; ++i){
    for(j = 0; j < 3; j++){
      cout << grid[i][j] + 3 << " ";
    }
  }
  
  cout << endl;

  // Now use a function to print arrays

  cout << endl << "Now we play with arrays of numbers" << endl;

  cout << endl;
  printArray(list, 5);
  cout << endl;
  printArray(list, 4);
  cout << endl;
  printArray(list2, 6);
  cout << endl;

  // doubleArray changes the array

  num = doubleArray(list, 5);

  cout << num << endl;

  printArray(list, 5);
 
  cout << endl;

  return 0;
}

int  totalLength(string s1, string s2)
{
  return s1.length() + s2.size(); // length() and size() do the same thing.
}

string oddOne(int n)                  
{
  if((n % 2) == 0){
    return "even";
  }
  else{
    return "odd";
  }
}

void printArray(int a[], int size)
{
  int i;

  for(i = 0; i < size; ++i){
    cout << a[i] << " ";
  }
}

int  doubleArray(int a[], int size)
{

  int i;

  for(i = 0; i < size; ++i){
    a[i] = a[i] * 2;
  }

  return a[0];
}