[已解决]C语言课后作业S1E45问题求助

治愈罗小黑 · 发表于 2022-8-3 23:49:54

马上注册，结交更多好友，享用更多功能^_^

您需要登录才可以下载或查看，没有账号？立即注册

x

用单链表实现如下图的结果：
003606zafqoqlffjx9a1z4.png.thumb.jpg

这是代码：

#include <stdio.h>
#include <stdlib.h>
struct Date
{
int year;
int month;
int day;
};
struct Record
{
char name[16];
int age;
struct Date first;
struct Date second;
struct Record *next;
};
void getInput(struct Record *record);
void printRecord(struct Record *head);
void addRecord(struct Record **head);
void releaseRecord(struct Record *head);
void getInput(struct Record *record)
{
printf("请问姓名是：");
scanf("%s", record->name);
printf("请问年龄是：");
scanf("%d", &record->age);
printf("请问是否接种过疫苗(Y/N)：");
getchar();
if (getchar() != 'Y')
{
record->first.year = 0;
printf("请尽快接种疫苗！\n");
}
else
{
printf("请输入第一针疫苗接种的日期(yyyy-mm-dd)：");
scanf("%d-%d-%d", &record->first.year, &record->first.month, &record->first.day);
printf("请问是否接种第二针疫苗(Y/N)：");
getchar();
if (getchar() != 'Y')
{
record->second.year = 0;
printf("请尽快接种第二针疫苗！\n");
}
else
{
printf("请输入第二针疫苗接种的日期(yyyy-mm-dd)：");
scanf("%d-%d-%d", &record->second.year, &record->second.month, &record->second.day);
}
}
putchar('\n');
}
void printRecord(struct Record *head)
{
struct Record *record;
record = head;
while (record != NULL)
{
printf("姓名：%s，年龄：%d\n", (*record).name, (*record).age);
if (record->first.year == 0)
{
printf("未接种疫苗！\n\n");
}
else
{
printf("第一针疫苗接种日期：%d-%d-%d，", (*record).first.year, (*record).first.month, (*record).first.day);
}
if ((*record).first.year != 0 && (*record).second.year == 0)
{
printf("未接种第二针疫苗！\n\n");
}
else if((*record).first.year != 0)
{
printf("第二针疫苗接种日期：%d-%d-%d\n\n", (*record).second.year, (*record).second.month, (*record).second.day);
}
record = record -> next;
}
}
void addRecord(struct Record **head)
{
struct Record *record, *temp;
record = (struct Record *)malloc(sizeof(struct Record));
if (record == NULL)
{
printf("内存分配失败！\n");
exit(1);
}
getInput(record);
if (*head != NULL)
{
temp = *head;
*head = record;
record->next = temp;
}
else
{
*head = record;
record->next = NULL;
}
}
void releaseRecord(struct Record *head)
{
struct Record *temp;
while (head != NULL)
{
temp = head;
head = head->next;
free(temp);
}
}
int main(void)
{
struct Record *head = NULL;
int ch;
while (1)
{
printf("请问是否需要录入(Y/N)：");
do
{
ch = getchar();
} while (ch != 'Y' && ch != 'N');
if (ch == 'Y')
{
addRecord(&head);
}
else
{
break;
}
}
printf("请问是否需要打印已录入数据(Y/N)：");
do
{
ch = getchar();
} while (ch != 'Y' && ch != 'N');
if (ch == 'Y')
{
printRecord(head);
}
releaseRecord(head);
return 0;
}

复制代码

在第59行的printRecord函数中，用了局部变量结构体指针*record，并令record = head;
我想问一下，这个局部变量结构体指针*record能省去吗？直接用head指针不好吗？

就是把printRecord函数代码写成这样：

void printRecord(struct Record *head)
{
while(head!=NULL)
{
printf("姓名：%s，年龄：%d\n",head->name,head->age);
if(head->first.year==0)
{
printf("未接种疫苗！\n");
}
else
{
printf("第一针疫苗接种日期：%d-%d-%d,",head->first.year,head->first.month,head->first.day);
if(head->second.year==0)
{
printf("未接种第二针疫苗！\n");
}
else
{
printf("第二针疫苗接种日期：%d-%d-%d\n",head->second.year,head->second.month,head->second.day);
}
}
putchar('\n');
head=head->next;
}
}