oddsevensrefs.cpp

C++高级编程这本书所附的源代码

#include <iostream>
using namespace std;

void printIntArr(const int arr[], int size)
{
  for (int i = 0; i < size; i++) {
    cout << arr[i] << " ";
  }
  cout << endl;
} 

void separateOddsAndEvens(const int arr[], int size, int*& odds, int& numOdds,
		  int*& evens, int& numEvens)
{
  int i;
  numOdds = numEvens = 0;
  for (i = 0; i < size; i++) {
    if (arr[i] % 2 == 1) {
      numOdds++;
    } else {
      numEvens++;
    }
  }

  odds = new int[numOdds];
  evens = new int[numEvens];

  int oddsPos = 0, evensPos = 0;
  for (i = 0; i < size; i++) {
    if (arr[i] % 2 == 1) {
      odds[oddsPos++] = arr[i];
    } else {
      evens[evensPos++] = arr[i];
    }
  }
}  

int main(int argc, char** argv)
{
  int unSplit[10] = {1, 2, 3, 4, 5, 6, 6, 8, 9, 10};
  int *oddNums, *evenNums;
  int numOdds, numEvens;

  separateOddsAndEvens(unSplit, 10, oddNums, numOdds, evenNums, numEvens);
  printIntArr(oddNums, numOdds);
  printIntArr(evenNums, numEvens);

  return (0);
}