请问这个程序有什么问题啊？
#include <stdio.h>#include <stdlib.h>
#include <string.h>
/*宏定义*/
#define N 100 /*假设学生个数是100*/
#define HEADER1 "--------------------------------------------------------------------\n"
#define HEADER2 "| Number | Name | Computer | Math | English | Sum | Average | Place |\n"
#define HEADER3 "|--------|------|----------|------|---------|-----|---------|-------|\n"
#define FORMAT "|%-10d|%-8d|%8d|%8d|%8d|%5d|%7.2f|%5d|\n"
#define DATA p->num,p->name,p->course,p->mscore,p->escore,p->total,p->ave,p->place
#define END "-----------------------------------------------------------------\n"
/*定义数据单元的结构体*/
typedef struct student
{
int num; /*学号*/
char name[15]; /*姓名*/
int cscore; /*计算机成绩*/
int mscore; /*数学成绩*/
int escore; /*英语成绩*/
int total; /*总分*/
float ave; /*平均分*/
int place; /*名次*/
}STU;
/*数据单元序列的相关信息*/
typedef struct pointer_info
{
STU*phead; /*指向第一个数据单元的指针*/
int count; /*数据单元的个数*/
char fname[15]; /*数据记录的文件名*/
int saveflag; /*0：已保存;1: 修改未保存*/
}PI;
/*函数申明*/
void Menu(); /*主菜单*/
void Add(PI*); /*添加新数据记录*/
void Disp(PI*); /*显示数据记录*/
void Del(PI*); /*删除数据记录*/
void Save(PI*pi); /*保存数据记录*/
void our(PI*pi); /*查询数据记录*/
void Modify(PI*pi); /*修改数据记录*/
void Sort(PI*pi); /*排序数据记录*/
void Load(PI*pi); /*加载数据记录文件*/
void New(PI*pi); /*新建数据记录文件*/
void Wrong(); /*错误提示*/
void printheader(); /*格式化输出表头*/
void main()
{
int sel;
STU * pstu;
PI pi;
/*分配数据序列单元内存*/
pstu = (STU*)malloc(N * sizeof(STU));
/*初始化pi的成员*/
pi.pHead = pstu;
pi.count = 0;
pi.fname[0] = '\0';
pi.saveflag = 0;
/*显示主菜单*/
Menu();
printf("Please input your choice[0~9]:");
do {
scanf("%d",&sel);
if (sel == 0)
{
if (pi.saveflag == 1)
{
if (strlen(pi.fname))
{
Save(&pi);
}
else
{
New(&pi);
Save(&pi);
}
}
break;
}
/*根据键盘输入进入相应的功能模块*/
switch(sel)
{
case 1:Add(&pi);break; /*增加学生记录*/
case 2:Disp(&pi);break; /*显示学生记录*/
case 3:Our(&pi);break; /*查询学生记录*/
case 4:Modify(&pi);break; /*修改学生记录*/
case 5:Del(&pi);break; /*删除学生记录*/
case 6:Sort(&pi);break; /*排序学生记录*/
case 7:New(&pi);break; /*新建数据文件*/
case 8:Load(&pi);break; /*加载数据文件*/
case 9:Save(&pi);break; /*保存数据文件*/
default:Wrong();break; /*按键有误，必须为数值0~9*/
｝
｝ while(1);
/*释放内存*/
pstu = pi.pHead;
free(pstu);
}
/*格式化输出表头*/
void printheaher()
{
printf(HEADER1);
printf(HEADER2);
printf(HEADER3);
}
/*主菜单*/
void Menu()
{
system("cls"); /*调用DOS命令，清屏，与clrscr()功能相同*/
printf(" The Students' Grade Management SSystem \n");
printf(" ************************MENU***************************\n");
printf(" * 1 input record *\n");
printf(" * 2 display record *\n");
printf(" * 3 search record *\n");
printf(" * 4 modify record *\n");
printf(" * 5 delete *\n");
printf(" * 6 sort record *\n");
printf(" * 7 new *\n");
printf(" * 8 load *\n");
printf(" * 9 save *\n");
printf(" * 0 quit *\n");
printf("*************************************************************\n");
}
/*输出错误信息*/
void Wrong()
{
printf("\n******Error: input has wrong! press any key to continue******\n");
}
/*由键盘录入学生成绩记录*/
void Add(PI * pi)
{
int num;
int i, numRepeatFlag = 0;
STU * pstu, *p;
do {
/*pstu指向下一个需要写入数据的单元*/
pstu = pi->pHead + pi->count;
/**p用来寻找重复的学号，因此指向数据序列的第一个单元*/
p = pi->pHead;
printf("please input the number: (enter '0' return menu)");
scanf("%d",&num);
/*学好重复处理： 要求输入的学号不能重复，否则重新输入*/
for (I = 1; i < pi->count;i++)
{
if (num == p->num)
{
printf("the number you input has exit,please inout another one!\n");
numRepeatFlag = 1;
break;
}
p++;
}
if (numRepeatFlag)
{
numRepeatFlag = 0;
continue;
}
else
{
Menu();
printf("Please input your choice[0~9]:");
break;
}
/*输入姓名*/
printf("please input the name:")
scanf("%s",pstu->name);
/*输入计算机成绩*/
printf("please input the computer score:");
scanf("%d",&pstu->cscore);
/*输入数学成绩*/
printf("please input the math score:");
scanf("%d",&pstu->mscore);
/*输入英语成绩*/
printf("please input the english score:");
scanf("%d",&pstu->escore);
/*计算总分和平均分*/
pstu->total = pstu->cscore + pstu->mscore + pstu->escore;
pstu->ave = (float)(pstu->total) / 3;
/*排名暂时清零，在排序模块中实现排名*/
pstu->place = 0;
/*数据单元个数自增1*/
pi->count++;
/*数据修改，为保存标志置1*/
pi->saveflag = 1;
} while(1);
}
/*在屏幕上先是学生成绩记录*/
void Disp(PI * pi)
{
int i;
STU * p;
/*显示主菜单*/
Menu();
p = pi->pHead;
if (pi->count == 0)
{
printf("no student record!");
printf("\nPlease input your choice[0~9]:");
return;
}
/*打印表格头部*/
printheader();
/*打印数据序列*/
for (i = 1; i <=pi->count; i++)
{
printf(FORMAT,DATE);
printf(HEADER3);
p++;
}
}
/*查询*/
void Qur(PI * pi)
{
int sel, i, num;
STU * p;
char name[15];
/*p为指向数据序列首部的指针*/
p = pi->pHead;
Menu();
/*1：根据学号查询；2：根据姓名查询；其他：返回*/
printf("1------------------------------search by number\n");
printf("2------------------------------search by name\n");
printf("any key other------------------return\n");
printf("please input your choice:[1,2]?");
scanf("%d",&sel);
if (sel != 1 && sel !=2)
{
return;
}
if (sel == 1)/*按学号查询*/
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printf("please input the number for search:");
scanf("%d",&num);
/*按学号搜索*/
for (i = 1; i <= pi->count; i++)
{
if (num == p->num)
{
break;
}
p++;
}
/*没有找到记录的情况*/
if (i > pi->count)
{
printf("no record found!\n");
return;
}
else{/*找到则打印输出*/
printheader();
printf(FORMAT,DATA);
printf(END);
}
}
else if (sel == 2)/*按姓名查询*/
{
printf("please input name to searc:");
scanf("%s",name);
/*按姓名搜索*/
for (i = 1; i <= pi->count; i++)
{
if (!strcmp(name, p->name))
{
break;
}
p++;
}
/*没有找到记录的情况*/
if (i > pi->count)
{
printf("no record found!\n");
return;
}
else
{
/*找到则打印输出*/
printheader();
printf (FORMAT,DATA);
printf(END);
}
}
printf("Please input your choice[0~9]:");
}
void Modify(PI * pi)
{
int num,i;
STU *p;
p = pi->pHead;
/*显示主菜单并将当前数据序列打印*/
Menu();
Disp(pi);
/*输入要修改的学生学号*/
printf("please inpput the number of student to modify:");
scanf("%d", &num);
/*通过指针遍历寻找要修改的数据单元*/
for (i = 1; i < pi->count; i++)
{
if (num = p->num)
{
break;
}
p++;
}
if (i > pi->count)
{ /*没有找到记录的情况*/
printf("no record found!\n");
return;
}
else
{ /*找到则修改*/
printf("please input the number:(enter '0' return menu)");
scanf("%d", &num);
if (num != 0)
{
p->num = num;
}
else
{
Menu();
return;
}
printf("please input the name:");
scanf("%s",p->name);
printf("please input the computer score:");
scanf("%d",&p->cscore);
printf("please input the math score:");
scanf("%d",&p->mscore);
printf("please input the english score:");
scanf("%d",&p->escore);
/*计算总分和平均分*/
p->total = p->cscore + p->mscore + p->escore;
p->ave = (float)(p->total/3);
p->place = 0;
/*修改后，将为保存标志为1*/
pi->saveflag = 1;
}
}
/*删除学生记录*/
void Del(PI * pi)
{
int sel, i, num;
int num;
char name[15];
STU * p;
p = pi->pHead;
Menu();
/*提供按照学号删除和按照姓名删除两种方式*/
printf("1-------------------------------delete by number\n");
printf("2-------------------------------delete by name\n");
printf("any key other-------------------return\n");
printf("please input your choice:[1,2]?");
scanf("%d",&sel);
if (sel != 1 && sel != 2){
return;
}
/*按学号删除*/
if (sel == 1)
{
/*输入要删除的学生记录的学号*/
printf("please input the number to delete:");
scanf("%d",&num);
/*按学号搜索*/
for (i = 1; i <= pi->count; i++)
{
if (num == p->num)
{
break;
}
p++;
}
if (i > pi->count) {
printf("no break found!\n");
return;
}
else if (i == pi->num) { /*如果删除最后一个记录，只需要讲count减1即可*/
pi->count--;
pi->saveflag = 1;
printf("record delete successfully!\n");
}
else{ /*删除中间某个记录，只要将其后的数据覆盖即可*/
mecpy(p, p+1,(pi->pHead + pi->count - p)*sizeof(STU));
pi->count--;
pi->saveflag = 1;
printf("record delete successfully!\n");
}
}
else if(sel == 2)/*按名字删除*/
{
printf("please input name to delete:");
scanf("%s",name);
/*按姓名搜索*/
for (i = 1; i <= pi-count; i++)
{
if (!stremp(name, p->name))
{
break;
}
p++;
}
if (i > pi->count) { /*没有找到记录的情况*/
printf("no record found!\n");
return;
}
else if (i == pi->count) { /*如果删除最后一个记录，只需将count减1即可*/
pi->count--;
pi->saveflag = 1;
printf("record delete successfully!\n");
}
else{ /*删除某个记录，只需将其后的数据前移覆盖即可*/
memcpy(p, p+1,(pi->pHead + pi->count - p)*sizeof(STU));
pi->count--;
pi->saveflag = 1;
printf("record delete successfully!\n");
}
}
printf("Please input your choice[0~9]:");
}
void Sort(PI * pi)
{
int i,j;
int sel;
STU * p;
/*提供按照学号排序和按照总分排序两钟方式*/
printf("1-----------------------------sort by number\n");
printf("2-----------------------------sort by sum\n");
printf("any key other-----------------return\n");
printf("please input your choice:[1,2]?");
scanf("%d",&sel);
if (sel != 1 && sel != 2){
return;
}
if (sel == 1)
{
/*冒泡法。按学号排序*/
for (i = 1; i <= pi->count -1; i++)
{
p = pi->pHead;
for (j = 1; j <= pi->count - i; j++, p++)
{
if (p->num > (p+1)->num) {
Swap(p, p+1); /*交换两个数据单元，由Swap函数实现*/
}
}
pi->saveflag = 1;
}
/*排序后的顺序就是排名(place)*/
p = pi->pHead;
for (i = 1; i <= pi->count; i++)
{
p->place = i;
p++;
}
pi->saveflag = 1;
}
/*将排序结果打印输出*/
Disp(pi);
printf("Place input your choice[0~9]:");
}
/*新建数据记录文件*/
void New(Pi * pi)
{
FILE * fp;
char name[15];
char fname[15] =".\\";
printf("please input the data file name for create:");
scanf("%s",name);
/*数据记录文件保存在当前文件夹下，后缀名为.dat*/
strcat(fname,name);
strcat(fname,".dat");
/*以只写方式打开二进制文献*/
fp=fopean(fname,"wb");
if(fp==NULL) /*打开文件失败*/
{
printf("\n====>open file error!\n");
return;
}
strcpy(pi->fname, fname);
fclose(fp);/*关闭文件*/
}
/*加载数据记录文件*/
void Load(PI * pi)
{
FILE * fp;
STU * p = pi->pHead;
char name[15];
char fname[15] =".\\";
printf("please input the data file name for load:");
scanf("%s",name);
strcat(fname,name);
/*以只读方式打开二进制文件*/
fp=fopen(fname,"rb");
if(fp==NULL) /*打开文件失败处理*/
{
printf("\n====>open file error!\n");
return;
}
/*pi清零*/
pi->count = 0;
pi->saveflag = 0;
while(!feof(fp))
{
if(fread(p,sizeof(STU),1,fp)) /*一次从文件中读取一条学生成绩记录*/
{
pi->count++;
p++;
}
}
strcpy(pi->fname, name);
printf("load data file %s successfully!", name);
fclose(fp);
}
/*保存数据记录文件*/
void Save(PI * pi)
{
FILE * fp;
int numwritten;
/*判断是否数据记录文件存在，如果不存在，则新建一个*/
if (!strlen(pi->fname))
New(pi);
fp=fopen(pi->fname,"wb";/*以只读方式打开二进制文件*/
if(fp==NULL) /*带来文件失败*/
{
printf("\n====>open file error!\n");
fclose(fp);
return;
}
/*如果数据记录不为空，则写入文件*/
if (pi->count) {
numwritten = fwrite(pi->pHead, 1, pi->count * sizeof(STU), fp);
pi->saveflag = 0;
printf("file save successfully!");
}
else
printf("no record for save!");
fclose(fp);
}
