代码如下

#include <iostream>

void bubble_sort(int arr[], int length)
{
    for (int i = 0; i < length - 1; i++) {
        for (int j = i + 1; j < length; j++) {
            if (arr[j] < arr[i]) {
                int temp = arr[j];
                arr[j] = arr[i];
                arr[i] = temp;
            }
        }
    }
}

int main()
{
    int arr[] = {56,32,45,12,52,32,61,8,5,4,2,1};
    bubble_sort(arr, sizeof(arr) / sizeof(arr[0]));

    for (auto num : arr)
        std::cout << num << " ";
    std::cout << std::endl;
}