结构体基础02

来源：互联网发布：辽东学院网络教学平台编辑：程序博客网时间：2024/05/16 04:00
#include <stdio.h>#include <stdlib.h>typedef struct _Teacher {    char name[100];    char *title;    int age;    char **p_stu;   // 每个老师带的学生} Teacher;// 在堆区分配内存Teacher *create_mem(int count){    Teacher *pt = NULL;    int i = 0, j = 0;    pt = (Teacher *)malloc(count*sizeof(Teacher));     // 为结构体的成员title(指针变量)开辟内存空间    for (i=0; i<count; i++){        pt[i].title = (char *)malloc(100);        // 为结构体的成员p_stu分配内存（二维数组）        char **tmp = (char **)malloc(3*sizeof(char *));        for (j=0; j<count; j++){            tmp[j] = (char *)malloc(100);        }        pt[i].p_stu = tmp;    }    return pt;}// 堆内存释放int free_mem(Teacher *p, int count){    int i = 0, j = 0;    if (p == NULL)        return -1;    for (i=0; i<count; i++){        char **tmp = p[i].p_stu;        if (tmp == NULL){            continue;        }        for (j=0; j<count; j++){            if (tmp[j] != NULL){                free(tmp[j]);            }        }        free(tmp);    }    for (i=0; i<count; i++){        if (p[i].title != NULL)            free(p[i].title);    }    free(p);}// 打印结构体成员ageint print_t(Teacher *p, int count){    int i = 0, j = 0;    for (i=0; i<count; i++){        printf("%d: %d  name: %s  title: %s\n", i+1, p[i].age, p[i].name, p[i].title);        for (j=0; j<count; j++){            printf("%s  ", p[i].p_stu[j]);        }        printf("\n");    }    return 0;}// 按照年龄对结构体进行排序int sort_t(Teacher *p, int count){    int i = 0, j = 0;    Teacher tmp;    for (i=0; i<count; i++){        for (j=i+1; j<count; j++){            if (p[i].age > p[j].age){                tmp = p[i];                p[i] = p[j];                p[j] = tmp;            }        }    }    return 0;}int main_1(void){    Teacher t_arr[3];    int i = 0, count = 3, j = 0;    for (i=0; i<3; i++){        printf("请输入第%d位老师的年龄：", i+1);        scanf("%d", &t_arr[i].age);        printf("请输入第%d位老师的姓名：", i+1);        scanf("%s", t_arr[i].name);        for (j=0; j<3; j++){            printf("请输入第%d位老师的姓名：", j+1);            scanf("%s", t_arr[i].p_stu[j]);        }    }    printf("-----排序之前-----\n");    print_t(t_arr, count);    printf("-----排序之后-----\n");    sort_t(t_arr, count);    print_t(t_arr, count);    return 0;}int main(void){    Teacher *pt = NULL;    int i = 0, count = 3, j = 0;    pt = create_mem(count);    // 从键盘的输入为结构体赋值    for (i=0; i<3; i++){        printf("请输入第%d位老师的年龄：", i+1);        scanf("%d", &pt[i].age);        printf("请输入第%d位老师的姓名：", i+1);        scanf("%s", pt[i].name);        printf("请输入第%d位老师的职称：", i+1);        scanf("%s", pt[i].title);        for (j=0; j<3; j++){            printf("请输入第%d位学生的姓名", j+1);            scanf("%s", pt[i].p_stu[j]);        }    }    // 打印结构体    printf("-----排序之前-----\n");    print_t(pt, count);    printf("-----排序之后-----\n");    sort_t(pt, count);    print_t(pt, count);    free_mem(pt, count);    pt = NULL;    return 0;}
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