如下代码，输出结果是什么？

#include <stdio.h>

int main()
{
   int arr[10] = {10};
   for(int i = 0;i < 10;i++)
    printf("%d\n",arr[i]);

   return 0;
}

输出结果：

10
0
0
0
0
0
0
0
0
0

本来以为应该全部输出的是10。
看到介绍：https://en.cppreference.com/w/c/language/array_initialization
文中有几个例子，引以为戒：

int x[] = {1,2,3}; // x has type int[3] and holds 1,2,3
int y[5] = {1,2,3}; // y has type int[5] and holds 1,2,3,0,0
int z[4] = {1}; // z has type int[4] and holds 1,0,0,0
int w[3] = {0}; // w has type int[3] and holds all zeroes

只有{0}时才全部初始化0，其余初始化是根据给定元素个数。