day5_结构体做函数参数

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1、结构体做函数参数

#define  _CRT_SECURE_NO_WARNINGS#include <stdio.h>#include <stdlib.h>#include <string.h>#include <windows.h>typedef struct teacher{    char name[64];    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 sortteacher(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];                array[i] = array[j];                array[j] = tmp;            }        }    }}teacher* createteacher(int num){    teacher *tmp = NULL;    tmp = (teacher *)malloc(sizeof(teacher) * num);    if(NULL == tmp)    {        return NULL;    }    return tmp;}void Freeteacher(teacher *p){    if(NULL != p)    {        free(p);        p = NULL;    }}int main0201(){    int i = 0;    teacher Array[3];//在栈上分配内存    for(i = 0; i<3; i++)    {        printf("输入年龄：\n");        scanf("%d",&(Array[i].age));    }    //打印老师的年龄    printteacher(Array, 3);    sortteacher(Array,3);    printf("排序后；\n");    printteacher(Array, 3);    system("pause");    return 0;}int main0202(){    int i = 0;//    teacher Array[3];//在栈上分配内存    int num  = 3;    teacher *pArray = NULL;    pArray = createteacher(num);    for(i = 0; i<num; i++)    {        printf("输入年龄：\n");        scanf("%d",&(pArray[i].age));    }    //打印老师的年龄    printteacher(pArray, num);    sortteacher(pArray,num);    printf("排序后；\n");    printteacher(pArray, num);    system("pause");    return 0;}

2、结构体套一级指针

#define  _CRT_SECURE_NO_WARNINGS#include <stdio.h>#include <stdlib.h>#include <string.h>#include <windows.h>typedef struct teacher{    char name[64];    char *sname;    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 sortteacher(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];                array[i] = array[j];                array[j] = tmp;            }        }    }}teacher* createteacher(int num){    teacher *tmp = NULL;    tmp = (teacher *)malloc(sizeof(teacher) * num);    if(NULL == tmp)    {        return NULL;    }    return tmp;}int createteacher02(teacher **pt, int num){    int i = 0;    teacher *tmp = NULL;    tmp = (teacher *)malloc(sizeof(teacher) * num);//teacher Array[3]    if(NULL == tmp)    {        return -1;    }    memset(tmp,0,sizeof(teacher) * num);    for(i = 0; i<num; i++)    {        tmp[i].sname = (char *)malloc(60);    }    *pt = tmp;//二级指针 形参间接的修改实参的值    return 0;}void Freeteacher(teacher *p, int num){    int i = 0;    if(NULL == p)    {        return;    }    for(i = 0; i<num; i++)    {        if(NULL != p->sname)        {            free(p[i].sname );        }    }    free(p);}int main0201(){    int i = 0;    teacher Array[3];//在栈上分配内存    for(i = 0; i<3; i++)    {        printf("输入年龄：\n");        scanf("%d",&(Array[i].age));    }    //打印老师的年龄    printteacher(Array, 3);    sortteacher(Array,3);    printf("排序后；\n");    printteacher(Array, 3);    system("pause");    return 0;}int main0302(){    int i = 0;//    teacher Array[3];//在栈上分配内存    int num  = 3;    teacher *pArray = NULL;    createteacher02(&pArray, num);    for(i = 0; i<num; i++)    {        printf("输入年龄：\n");        scanf("%d",&(pArray[i].age));        printf("输入姓名：\n");        scanf("%s",pArray[i].name);//向指针所指向的内存空间写入数据        printf("输入别名：\n");        scanf("%s",pArray[i].sname);//sname没有分配空间    }    //打印老师的年龄    printteacher(pArray, num);    sortteacher(pArray,num);    printf("排序后；\n");    printteacher(pArray, num);    Freeteacher(pArray, num);    system("pause");    return 0;}

3、结构体套二级指针

#define  _CRT_SECURE_NO_WARNINGS#include <stdio.h>#include <stdlib.h>#include <string.h>#include <windows.h>typedef struct teacher{    char name[64];    char *sname;    char **stuname;// char student[10][30]    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 sortteacher(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];                array[i] = array[j];                array[j] = tmp;            }        }    }}int createteacher02(teacher **pt, int num){    int i = 0;    int j = 0;    teacher *tmp = NULL;    char **p = NULL;    tmp = (teacher *)malloc(sizeof(teacher) * num);//teacher Array[3]    if(NULL == tmp)    {        return -1;    }    memset(tmp,0,sizeof(teacher) * num);    for(i = 0; i<num; i++)    {        //malloc一级指针        tmp[i].sname = (char *)malloc(60);        //二级指针的第三种内存模型        {            //打造二维内存            p = (char **)malloc(3 * sizeof(char *));            for(j = 0; j<3; j++)            {                p[j] = (char *)malloc(120);            }            tmp[i].stuname = p;        }    }    *pt = tmp;//二级指针 形参间接的修改实参的值    return 0;}void Freeteacher(teacher *p, int num){    int i = 0;    int j = 0;    if(NULL == p)    {        return;    }    for(i = 0; i<num; i++)    {        //释放一级指针        if(NULL != p->sname)        {            free(p[i].sname );        }        //释放二级指针        if(NULL != p[i].stuname)        {            char **myp = p[i].stuname;            for(j = 0; j<3; j++)            {                if(NULL != myp[j])                {                    free(myp[j]);                }            }            free(myp);            p[i].stuname = NULL;        }    }    free(p);}int main0201(){    int i = 0;    teacher Array[3];//在栈上分配内存    for(i = 0; i<3; i++)    {        printf("输入年龄：\n");        scanf("%d",&(Array[i].age));    }    //打印老师的年龄    printteacher(Array, 3);    sortteacher(Array,3);    printf("排序后；\n");    printteacher(Array, 3);    system("pause");    return 0;}int main(){    int i = 0;    int j = 0;//    teacher Array[3];//在栈上分配内存    int num  = 3;    teacher *pArray = NULL;    createteacher02(&pArray, num);    for(i = 0; i<num; i++)    {        printf("输入年龄：\n");        scanf("%d",&(pArray[i].age));        printf("输入姓名：\n");        scanf("%s",pArray[i].name);//向指针所指向的内存空间写入数据        printf("输入别名：\n");        scanf("%s",pArray[i].sname);//sname没有分配空间        for(j = 0; j<3; j++)        {            printf("input student name:");            scanf("%s",pArray[i].stuname[j]);        }    }    //打印老师的年龄    printteacher(pArray, num);    sortteacher(pArray,num);    printf("排序后；\n");    printteacher(pArray, num);    Freeteacher(pArray, num);    system("pause");    return 0;}

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