释放结构体数组里面的指针

//定义如下结构体
typedef struct student
{
    int id;
    char* name;
} student_t;

int main(){

    //有四种定义形式

    //一、结构体变量
    student_t xiaoming; //不需要为结构体分配内存，但是需要对name分配内存
    xiaoming.name =(char*)malloc(10);
    free(xiaoming.name); //释放成员指针

    //二、结构体指针
    student_t *xiaoming=NULL;
    xiaoming = (student_t*）malloc(sizeof(student_t));
    xiaoming.name =(char*)malloc(10);
    free(xiaoming.name); //释放成员指针
    free(xiaoming); //释放指针

    //三、结构体数组
    student_t xiaoming[3];
    for( i = 0; i<3 ; i++ )
    {
      xiaoming[i].name = (char*)malloc(10); //初始化
    }
    for( i = 0; i<3 ; i++ )
    {
      free(xiaoming[i].name); //释放成员指针
    }
    
    //四、结构体数组（第三种的另一种写法）
    student_t *xiaoming=NULL;
    xiaoming = (student_t*）malloc(sizeof(student_t)*3);
    for( i = 0; i<3 ; i++ )
    {
      xiaoming[i].name = (char*)malloc(10); //初始化
    }
    for( i = 0; i<3 ; i++ )
    {
      free(xiaoming[i].name); //释放成员指针
    }
    free(xiaoming); //释放数组
    
    return 0;
}