#include<stdio.h>
#include<string.h>
#include<math.h>
#include<stddef.h>
int main()
{
int arr[3][4];
char ch[3][10];
int arr[3][4] = {1,2,3,4,5,6,7,8,9,10,11,12};//初始化
int arr[3][4] = {1,2,3,4,5,6};//不完全初始化-后面补0
int arr[3][4] = {1,2,3,4,5,6,7,8,9,10,11,12};
int arr[3][4] = {{1,2},{3,4},{5,6}};
return 0;
}