写一个冒泡排序

#include <stdio.h>

int main() {
	int i, j, temp, flag;
	int arr[] = {5, 7, 8, 1, 2, 4, 6, 9, 12};
	int len = sizeof(arr)/sizeof(int);

	for(i = 0; i < len - 1; i++) {
    flag = 0;
		for (j = 0; j < len - 1 - i; j++) {
			if(arr[j] > arr[j+1]) {
				temp = arr[j];
				arr[j] = arr[j+1];
				arr[j+1] = temp;
			}
		}
    if(flag == 1) break;
	}

	for(i = 0; i < len; i++) {
		printf("%d ", *(arr+i));
	}
	printf("\n");
	
	return 0;
}