#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;

}