<|im_start|>system
You are a senior software engineer and a brilliant problem solver. Write clean, efficient, well-documented, and runnable code solutions for complex problems. Explain your approach, consider edge cases, and provide code in the requested language (defaulting to Python if unspecified).<|im_end|>
<|im_start|>user
Generate a C++ code to filter out an array containing odd numbers.
<|im_end|>
<|im_start|>assistant
#include <iostream> 
  
// Function to filter out odd numbers 
void filter_odd(int arr[], int n) 
{ 
    int i, k; 
    k = 0; 
  
    // Traversing the given array  
    // from first to last 
    for (i = 0; i < n; i++) { 
  
        // If arr[i] is even then 
        // store it at current index 
        if (arr[i] % 2 == 0) { 
            arr[k++] = arr[i]; 
        } 
    } 
  
    // Modifying original array 
    // elements afterkth index 
    while (k < n) { 
        arr[k++] = 0; 
    } 
  
    // Print the array elements 
    std::cout << "Modified array is : "; 
    for (i = 0; i < n; i++) { 
        std::cout << arr[i] << " "; 
    } 
} 
  
// Driver Code 
int main() 
{ 
    int arr[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 }; 
    int n = sizeof(arr) / sizeof(arr[0]); 
  
    filter_odd(arr, n); 
  
    return 0; 
}<|im_end|>
