结构体做函数参数，即结构体中套一级指针，结构体中套二级指针

小咪咪 2023-05-29 05:03 7阅读 0赞

直接上代码：

#define  _CRT_SECURE_NO_WARNINGS 
    #include <stdlib.h>
    #include <string.h>
    #include <stdio.h>
    
    /*
    "name1111"
    "name2222"
    "name3333"
    */
    
    typedef struct Teacher
    {
    	//char student[10][30]
    	char name[64];
    	char *alisname;  //结构体中的一级
    	char **stuname; 
    	int age ;
    	int id;
    }Teacher;
    
    void printTeacher(Teacher *array, int num)
    {
    	int i = 0;
    
    	for (i=0; i<num; i++)
    	{
    		printf("age:%d \n", array[i].age);
    	}
    }
    
    void sortTeacer(Teacher *array, int num)
    {
    	int		i,j;
    	Teacher tmp;
    
    	for (i=0; i<num; i++)
    	{
    		for (j=i+1; j<num; j++)
    		{
    			if (array[i].age > array[j].age)
    			{
    				tmp = array[i];  //=号操作  赋值操作
    				array[i] = array[j];
    				array[j] = tmp;
    			}
    		}
    	}
    }
    
    Teacher * createTeacher01(int num)
    {
    	Teacher * tmp = NULL;
    	tmp = (Teacher *)malloc(sizeof(Teacher) * num); //	Teacher		Array[3]
    	if (tmp == NULL)
    	{
    		return NULL;
    	}
    	return tmp; //
    
    }
    
    int createTeacher02(Teacher **pT, int num)
    {
    	int i = 0, j = 0;
    	Teacher * tmp = NULL;
    	tmp = (Teacher *)malloc(sizeof(Teacher) * num); //	Teacher		Array[3]
    	if (tmp == NULL)
    	{
    		return -1;
    	}
    	memset(tmp, 0, sizeof(Teacher) * num);
    
    	for (i=0; i<num; i++)
    	{
    		char **p = NULL;
    
    		//malloc一级指针
    		tmp[i].alisname = (char *)malloc(60);
    
    		//二级指针的第三种内存模型
    		p = (char **)malloc(3 * sizeof(char *));  //打造二维内存
    		for (j=0; j<3; j++)
    		{
    			p[j] = (char *)malloc(120);
    		}
    		tmp[i].stuname = p; //
    	
    	}
    
    	*pT = tmp;  //二级指针 形参 去间接的修改 实参 的值 
    	return 0; //
    }
    
    void FreeTeacher(Teacher *p, int num)
    {
    	int	i = 0, j = 0;
    	if (p == NULL)
    	{
    		return;
    	}
    	for (i=0; i<num; i++)
    	{
    		//释放一级指针
    		if (p[i].alisname != NULL)
    		{
    			free(p[i].alisname);
    		}
    
    		//释放二级指针
    		if (p[i].stuname != NULL)
    		{
    			char **myp = p[i].stuname ;
    			for (j=0; j<3; j++)
    			{
    				if (myp[j] != NULL)
    				{
    					free(myp[j]);
    				}
    			}
    			free(myp);
    			p[i].stuname = NULL;
    		}
    	}
    	free(p);
    }
    
    void main()
    {
    	int			ret = 0;
    	int			i = 0, j = 0;
    	//Teacher		Array[3];  //在stack 分配内存
    	int			num = 3;
    	Teacher *pArray = NULL;
    	ret = createTeacher02(&pArray, num);
    	if (ret != 0)
    	{
    		printf("func createTeacher02() er:%d \n ", ret);
    		return ;
    	}
    
    	for (i=0; i<num; i++)
    	{
    		printf("\nplease enter age:");
    		scanf("%d", & (pArray[i].age) );
    
    		//printf("\nplease enter name:");
    		//scanf("%s",  pArray[i].name ); //向指针所指的内存空间copy数据
    
    		printf("\nplease enter alias:");
    		scanf("%s",  pArray[i].alisname );  //向指针所指的内存空间copy数据
    
    		for (j=0; j<3; j++)
    		{
    			printf("please enter student name:");
    			scanf("%s",pArray[i].stuname[j] );   //注意这个地方
    		}
    	}
    
    	//打印老师年龄
    	// 	for (i=0; i<num; i++)
    	// 	{
    	// 		printf("age:%d \n", Array[i].age);
    	// 	}
    
    	printTeacher(pArray, num);
    
    	sortTeacer(pArray, num);
    
    	printf("排序之后\n");
    
    	printTeacher(pArray, num);
    
    	FreeTeacher(pArray, num);
    
    	printf("hello...\n");
    	system("pause");
    	return ;
    }