结构体嵌套二级指针

结构体嵌套二级指针

代码示例：

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
struct Teacher
{
   
        char *name;
        char**Students;
};
void allocateSpace(struct Teacher***teachers)
{
   
        struct Teacher **pArray=malloc(sizeof(struct Teacher*)*3);
        for (int i = 0; i < 3; i++)
        {
   
               //给每个老师分配空间
               pArray[i] = malloc(sizeof(struct Teacher));
               //给每个老师姓名 分配空间
               pArray[i]->name=malloc(sizeof(char) * 64);
               sprintf(pArray[i]->name,"Teacher_%d",i+1);
               //给老师带的学生的数组分配空间
               pArray[i]->Students = malloc(sizeof(char*) * 4);
               
               //给4个学生分配内存，并且赋值
               for (int j=0;j<4;j++)
               {
   
                       pArray[i]->Students[j] = malloc(sizeof(char) * 64);
                       sprintf(pArray[i]->Students[j],"%s_Student_%d",pArray[i]->name,j+1);
               }
        }
        *teachers = pArray;
}
void showArray(struct Teacher**pArray,int len)
{
   
        for (int i = 0; i < len; i++)
        {
   
               printf("%s\n",pArray[i]->name);
               for (int j = 0; j < 4; j++)
               {
   
                       printf(" %s\n",pArray[i]->Students[j]);
               }
        }
}
void freeSpace(struct Teacher**pArray,int len)
{
   
        for (int i = 0; i < len; i++)
        {
   
               //释放老师姓名
               if (pArray[i]->name != NULL)
               {
   
                       free(pArray[i]->name);
                       pArray[i]->name = NULL;
               }
               //释放每个学生
               for (int j = 0; j < 4; j++)
               {
   
                       if (pArray[i]->Students[j] != NULL)
                       {
   
                              free(pArray[i]->Students[j]);
                              pArray[i]->Students[j] = NULL;
                       }
               }
               //释放学生数组
               free(pArray[i]->Students);
               pArray[i]->Students = NULL;
               //释放老师
               free(pArray[i]);
               pArray[i]->Students = NULL;
        }
        //释放老师数组
        free(pArray);
        pArray = NULL;
}
void test01()
{
   
        struct Teacher**pArray = NULL;
        //分配·内存
        allocateSpace(&pArray);
        //打印数组
        showArray(pArray,3);
        //释放内存
        freeSpace(pArray,3);
        pArray = NULL;
}
int main()
{
   
        test01();
        return EXIT_SUCCESS;
}