c语言，遇到问题，求解

#include<stdio.h>

int main(){
    int arr[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
    int left = 0;
    int right = sizeof(arr) / sizeof(arr[0]) - 1;
    int k;

    printf("请输入您想要查找的数字: ");
    scanf("%d", &k);

    while(left <= right){
        int mid = (left + right) / 2;

        if(arr[mid] == k){
            printf("找到了这个数，它的下标为: %d，这个数为: %d\n", mid, arr[mid]);
            break;
        }
        else if(arr[mid] < k){
            left = mid + 1;
        }
        else{
            right = mid - 1;
        }
    }

    if(left > right){
        printf("找不到这个数\n");
    }

    return 0;
}