【求助】基础测试里的一道题 - 黑马程序员技术交流社区

#include <stdio.h>
#include <stdlib.h>
typedef struct student
{
char name[30]; char sex;
int age;
float score;
}STU;
typedef struct node
{
struct student data;
struct node *next;
}Node;
void init()
{
STU stu[5] =
{
{"zhangsan",'s',12,99.4},
{"lisi",'x',34,34.5},
{"wangwu",'a',23,45.6},
{"zhaoliu",'b',23,89.0},
{"bob",'s',89,23.7}
};
FILE * fp = fopen("stu.data","w");
fwrite(stu,sizeof(STU),5,fp);
fclose(fp);
}
Node *createListFromFile()
{
Node *head = (Node*)malloc(sizeof(Node));
head->next = NULL;
FILE *fp = fopen("stu.data","r");
if(fp == NULL) return -1;
Node * cur = (Node*)malloc(sizeof(Node));
while(fread(&cur->data,sizeof(STU),1,fp)>0) {
cur->next = head->next; head->next = cur;
cur = (Node*)malloc(sizeof(Node)); }
free(cur);
return head;
}
void displayStudent(Node * head)
{
head = head->next;
while(head)
{
printf("%10s\t%c\t%d\t%g\t \n",
head->data.name, head->data.sex,
head->data.age,head->data.score);
head = head->next;
}
}
void insertStudent(Node *head)
{
Node * cur = (Node*)malloc(sizeof(Node));
printf("name:");
scanf("%s",cur->data.name);
getchar();
printf("sex:");
scanf("%c",&cur->data.sex);
printf("age:");
scanf("%d",&cur->data.age);
printf("score:");
scanf("%f",&cur->data.score);
cur->next = head->next;
head->next = cur;
}
void deleteStudent(Node *head)
{
printf("input student name:");
char buf[30];
scanf("%s",buf);
Node * pfind = head;
while(pfind != NULL)
{
if(strcmp(pfind->data.name,buf) == 0)
break;
pfind = pfind->next;
}
if(pfind == NULL) printf("find none\n");
else{
while(head->next != pfind) head = head->next;
head->next = pfind->next;
free(pfind);
}
return ;
}
void saveStudent2File(Node *head)
{
FILE *fp = fopen("stu.data","w");
head = head->next;
while(head != NULL)
{
fwrite(&head->data,sizeof(STU),1,fp);
head = head->next;
}
fclose(fp);
}
int main(void)
{
// init();
Node * head;
head = createListFromFile();
int choice;
while(1)
{
system("cls");
displayStudent(head);
printf("1->insert \t2->delete\t3->exit\t\n"); scanf("%d",&choice);
switch(choice)
{
case 1: insertStudent(head); break;
case 2: deleteStudent(head); break;
case 3: saveStudent2File(head); return 0;
default:
break;
}
}
return 0;
}

复制代码