链表应用：成绩录入与打印

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct Student
{
    char name[40];
    float score;
    struct Student *next;
    
};

void inputInfo(struct Student *);
void addStudent(struct Student **);
void printfInfo(struct Student *);
void releaseInfo(struct Student **);

void inputInfo(struct Student *stu)
{
    printf("请输入学生姓名：");
    scanf("%s", stu->name);
    printf("请输入学生成绩：");
    scanf("%f", &stu->score);
}


void addStudent(struct Student **list_head)
{
    struct Student *stu;
    struct Student *temp; 
    
    stu = (struct Student *)malloc(sizeof(struct Student));  // 为新建的学生创建内存空间
    if (stu == NULL)
    {
        printf("内存申请失败！");
        exit(1);
    }
    
    inputInfo(stu);  
    
    // 修改头指针的值，改为新增元素的地址，也就是stu；
    // 对list_head解引用，就是头指针的值
    
    if (*list_head != NULL)
    {
        temp = *list_head;
        *list_head = stu;
        stu -> next = temp;
    }
    else
    {
        *list_head = stu;
        stu -> next = NULL;
    }
}


void printInfo(struct Student *stu)
{
    int count = 1;
    while(stu != NULL)
    {
        printf("编号：%d\n", count);
        printf("姓名：%s\n", stu->name);
        printf("成绩：%.2f\n", stu->score);
        printf("-----------------\n");
        stu = stu -> next;
        count++;
    }
}


void releaseInfo(struct Student **stu)
{   struct Student *temp;

    while (*stu != NULL)
    {
        temp = *stu;
        *stu = (*stu)->next;
        free(temp);
    }

}

        /*
        temp = stu;
        stu = stu->next;
        free(temp);
        */



int main(void)
{
    int ch;
    struct Student *list_head;
    list_head = NULL;
    while(1)
    {
        printf("是否输入学生信息(y/n)：");

        
        do
        {
            ch = getchar();
        }while (ch != 'y' && ch != 'n');
        
        if (ch == 'y')
        {
            addStudent(&list_head);
        }
        else
        {
            break;
        }
            
    }
    
    printf("是否打印成绩信息(y/n)：");
    do 
    {
        ch = getchar();
    }while(ch != 'y' && ch != 'n');
    
    if (ch == 'y')
    {
        printf("\n----成绩单----\n\n");
        printInfo(list_head);
    }
    
    releaseInfo(&list_head);
    // releaseInfo(list_head);
 

    
    
    return 0;
}