关于c:选择排序

#include <stdio.h>void dispaly(int* arr, int length){    for (int i = 0; i < length; ++i)    {        printf("%d%s", arr[i], i == length - 1 ? " " : ", ");    }    printf("\n");}void swap(int* a, int* b){    int temp = *a;    *a = *b;    *b = temp;}void select(int* arr, int length){    for (int i = 0; i < length - 1; ++i)    {        int minIndex = i;        for (int j = i + 1; j < length; ++j)        {            if (arr[j] < arr[minIndex]) {                minIndex = j;            }        }                if (i == minIndex) {            continue;        }        swap(&arr[i], &arr[minIndex]);    }}int main(int argc, char const *argv[]){    int arr[] = {3, 4, 2, 6, 7, 1, 7, 7, 21, 87, 22, 66, 11};    int length = sizeof(arr) / sizeof(int);    dispaly(arr, length);    select(arr, length);    dispaly(arr, length);    return 0;}