清屏函数用不了！

dong50252409 · 发表于 2011-8-7 23:15:01

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本帖最后由 dong50252409 于 2011-8-10 12:09 编辑

/* Note:Your choice is C IDE */
#include <stdio.h>
#include <stdlib.h>
#define LEN sizeof(struct student)
struct student
{
char num[6], name[20], sex[3];//定义学号、姓名、性别
float math, english, politics, chinese, sum;//定义数学、英语、**、语文、总分
struct student *next;
};
//菜单
void menu()
{
system("cls");//清屏
printf("-------------------------------------------------------------------------------");
printf("\n 学生数据管理系统\n");
printf("\n [0]退出\n");
printf("\n [1]创建学生数据\n");
printf("\n [2]添加学生数据\n");
printf("\n [3]删除学生数据\n");
printf("\n [4]查询\n");
printf("-------------------------------------------------------------------------------");
}
// 等待用户按回车后回到主菜单
void to_menu()
{
char c1, c2;
printf("\n\n\n按回车键返回主菜单...");
scanf("%c%c",&c1,&c2);//第一个字符吸收上次的确认回车键
menu();
}
//录入学生输入
struct student *init(int n)
{
int i;
struct student *head, *p, *s;
for(i = 1;i <= n;i++)
{
if(i == 1)
{
printf("\n请输入第%d个学生信息:",i);
p = (struct student *)malloc(LEN);//开辟存储单元
printf("\n学号:");
scanf("%s",&p->num);
printf("\n姓名:");
scanf("%s",&p->name);
printf("\n性别:");
scanf("%s",&p->sex);
printf("\n数学成绩:");
scanf("%f",&p->math);
printf("\n英语成绩:");
scanf("%f",&p->english);
printf("\n**:");
scanf("%f",&p->politics);
printf("\n语文成绩:");
scanf("%f",&p->chinese);
p->sum = p->math + p->english + p->politics + p->chinese;
printf("\n学号\t姓名\t性别\t数学\t英语\t**\t语文\t总分\n");
printf("------------------------------------------------------------\n");
printf("%s\t%s\t%s\t%.1f\t%.1f\t%.1f\t%.1f\t%.1f\n",p->num, p->name, p->sex, p->math, p->english, p->politics, p->chinese, p->sum);
head = p;
if(n == 1) p->next = NULL;
}
else
{
printf("\n请输入第%d个学生信息:",i);
s = (struct student *)malloc(LEN);
printf("\n学号:");
scanf("%s",&s->num);
printf("\n姓名:");
scanf("%s",&s->name);
printf("\n性别:");
scanf("%s",&s->sex);
printf("\n数学成绩:");
scanf("%f",&s->math);
printf("\n英语成绩:");
scanf("%f",&s->english);
printf("\n**:");
scanf("%f",&s->politics);
printf("\n语文成绩:");
scanf("%f",&s->chinese);
s->sum = s->math + s->english + s->politics + s->chinese;
printf("\n学号\t姓名\t性别\t数学\t英语\t**\t语文\t总分\n");
printf("------------------------------------------------------------\n");
printf("%s\t%s\t%s\t%.1f\t%.1f\t%.1f\t%.1f\t%.1f\n",s->num, s->name, s->sex, s->math, s->english, s->politics, s->chinese, s->sum);
p->next = s;
p = s;
s->next = NULL;
}
}
return head;
}
//添加学生数据
void insert(struct student *head)
{
struct student *p, *pi;
char num[6];
printf("\n请问要在哪个学生后面插入数据(输入学号):");
scanf("%s",num);
pi = (struct student *)malloc(LEN);
p = head;
printf("\n学号:");
scanf("%s",&pi->num);
printf("\n姓名:");
scanf("%s",&pi->name);
printf("\n性别:");
scanf("%s",&pi->sex);
printf("\n数学成绩:");
scanf("%f",&pi->math);
printf("\n英语成绩:");
scanf("%f",&pi->english);
printf("\n**:");
scanf("%f",&pi->politics);
printf("\n语文成绩:");
scanf("%f",&pi->chinese);
pi->sum = pi->math + pi->english + pi->politics + pi->chinese;
if(head == NULL)
{
head = pi;
pi->next = NULL;
}
else
{
while((p->num != num) && (p->next != NULL))
{
p = p->next;
}
if(p->next != NULL)
{
pi->next = p->next;
p->next = pi;
}
else
{
p->next = pi;
pi->next = NULL;
}
}
}
//删除学生数据
struct student *del(struct student *head, char n[6])
{
struct student *p, *q;
p = head;
if(head = NULL)
{
printf("\n没有学生的资料要删除!");
return head;
}
while(p->num != n && p->next != NULL)
{
q = p;
p = p->next;
}
if(p->num == n)
{
if(p == head)
{
head = p->next;
}
else
{
q->next = p->next;
}
free(p);
}
else
{
printf("\n找不到相应的学生资料!");
}
return head;
}
//列表
void list(struct student *head)
{
int i = 0;
struct student *p;
p = head;
printf("\n学号\t姓名\t性别\t数学\t英语\t**\t语文\n");
printf("----------------------------------------------------\n");
while(p != NULL)
{
printf("%s\t%s\t%s\t%.1f\t%.1f\t%.1f\t%.1f\t%.1f\n",p->num, p->name, p->sex, p->math, p->english, p->politics, p->chinese, p->sum);
p = p->next;
}
printf("----------------------------------------------------\n");
}
//保存
void save(struct student *head)
{
FILE *fp;
struct student *p;
p = head;
if((fp = fopen("stu_list","wb")) == NULL)
{
printf("\n不能打开指定文件!");
to_menu();
}
while(p)
{
fwrite(p, sizeof(struct student), 1, fp);
p = p->next;
}
fclose(fp);
}
//读取
struct student *read()
{
FILE *fp;
struct student *p;//工作指针
struct student *last, *head;//最后一项指针
head = (struct student*)malloc(LEN);
last = head;
if((fp = fopen("stu_list","rb")) == NULL)
{
printf("\n不能打开指定文件!");
to_menu();
}
while(!feof(fp))
{
p = (struct student *)malloc(LEN);
if(fread(p, sizeof(struct student), 1, fp) == 1)
{
last->next = p;
last = last->next;
}
}
fclose(fp);
return head = head->next;
}
//主函数
void main()
{
char fun;
int n;
struct student *head;
menu();
printf("\n请输入功能号[0-4]:");
while((fun = tolower(getchar())) != '0')
{
switch(fun)
{
case '1':
{
printf("\n请输入班级总人数:");
scanf("%d",&n);
head = init(n);
list(head);
save(head);
break;
}
case '2':
{
insert(head);
list(head);
save(head);
break;
}
case '3':
{
char num[6];
printf("\n请输入要删除学生的学号:");
scanf("%s",num);
head = del(head,num);
list(head);
save(head);
break;
}
}
}
}

复制代码

不能加入清屏函数一加入就报错

dong50252409 · 发表于 2011-8-7 23:17:39

例如在36行98行145加入system(cls);就各种报错都不知道哪来的

bevin · 发表于 2011-8-8 00:41:00

dong50252409 发表于 2011-8-7 23:17

登录/注册后可看大图

例如在36行98行145加入system(cls);就各种报错都不知道哪来的

是不是该加点头文件什么的？比如#include<windows.h>？？？

dong50252409 · 发表于 2011-8-8 08:24:52

15行的清屏函数就好使不报错

soldier · 发表于 2011-8-8 08:50:20

我这里没有报错.

dong50252409 · 发表于 2011-8-8 10:21:22

这就奇怪了

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