C语言之分配

#include "stdio.h"
void main()
{
int arr[3] = {1,2,3};
int* arr2 = malloc(3*sizeof(int));//malloc calloc relloc
arr2[0] = 1;
arr2[2] = 3;

printf("%d\n",arr2[0]);
printf("%d\n",arr2[1]);
printf("%d\n",arr2[2]);

free(arr2);//释放资源内存，否则电脑会卡
}