动态数组

#include <stdio.h>
#include <stdlib.h>

typedef struct _my{
  char a;
  int b[]; //动态数组
} my;

int main()
{
    int c = 5;　 //变量
    my *p;
    printf("struct size %d %d\n",sizeof(my),sizeof(int));
    p = (my*)malloc(sizeof(my) + c * sizeof(int)); //内存空间申请

   return 0;
}