导师学生模型问题模型
利用结构体中套二级指针 创建内存的方式
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; //
#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;
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]);
}
}
//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;
}
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