缺点：

1，没有限制输入位数

2，ReadData函数以及控制输出函数返回值为指针，这个并不安全

改进方法：

1，把学号类型改为字符串类型，利用conio.h和getch()函数可以进行判断读取，详细可参考orderdish点餐系统

2，把​返回值为指针的函数该为void Funtion (pointer * pOutput)的形式，把对指针的操作改为传递指针值进行函数内部操作。

#include

#include

#include

#include    

#include

#include

#include

#define MAX_LEN 50

#define STLEN sizeof(STSI)

int WhereX()  

{  

    CONSOLE_SCREEN_BUFFER_INFO pBuffer;  

    GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &pBuffer);  

    return (pBuffer.dwCursorPosition.X+1);  

}  

int WhereY()  

{  

    CONSOLE_SCREEN_BUFFER_INFO pBuffer;  

    GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &pBuffer);  

    return (pBuffer.dwCursorPosition.Y+1);  

}

void gotoxy(int x,int y)   

{  

    COORD c;  

    c.X=x-1;  

    c.Y=y-1;  

    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE),c);  

}   

typedef struct tagSTSI

{

    int nStuNo;

    char szName[MAX_LEN+1];

    int nAge;

    float fGPA;

    float fTuition;

    struct tagSTSI * pNext;

}STSI;

char gszFilename[30] = "student.dat";

STSI * ReadData(void)

{

    int n;

    STSI * pHead = NULL;

    STSI * pPrev;

    STSI * pCurrent;

    FILE * pFile;

    if ((pFile = fopen(gszFilename,"ab")) == NULL)

    {

        puts("创建文档出错");

        exit(EXIT_FAILURE);

    }

    rewind(pFile);

    fclose(pFile);

    if ((pFile = fopen(gszFilename,"r+b")) == NULL)

    {

         puts("打开文档出错");

         exit(EXIT_FAILURE);

    }

    while (!feof(pFile))

    {

        if (fscanf(pFile,"%d",&n) != EOF)

        {

if ((pCurrent = (STSI *) malloc(STLEN)) == NULL)

{

puts("内存申请出错");

fclose(pFile);

exit(EXIT_FAILURE);

}

if (fread(pCurrent,STLEN,1,pFile) != 1)

{

puts("文件读取出错");

free(pCurrent);

exit(EXIT_FAILURE);

}

if (pHead == NULL)

{

pHead = pPrev = pCurrent;

}

else

{

pPrev->pNext = pCurrent;

pPrev = pCurrent;

}

}

else

{

break;

}

    }

    fclose(pFile);

//puts("文件读取成功");

    return pHead;

}

STSI * CreatNode(int nCN)

{

    int nCount;

    size_t nJudge;

int nX,nY;

    STSI * pHead;

    STSI * pPrev;

    STSI * pCurrent;

    STSI * pSTF;

    pSTF = ReadData();

    for (nCount = 0; nCount < nCN; nCount++)

    {

         pCurrent = (STSI *) malloc(STLEN);

         puts("请输入学号,返回请输入0");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

scanf("%d",&(pCurrent->nStuNo));

system("cls");

if ( pCurrent->nStuNo == 0)

{

return NULL;

}

         while (pSTF != NULL)

         {

             while (pSTF->nStuNo == pCurrent->nStuNo)

             {

                printf("学号重复，请在下一行重新输入新的学号，返回请输入0\n");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

                scanf("%d",&(pCurrent->nStuNo));

if ( pCurrent->nStuNo == 0)

{

return NULL;

}

                system("cls");

             }

             pSTF = pSTF->pNext;

         }

         puts("请输入名字，返回请输入0");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

         scanf("%s",pCurrent->szName);

         system("cls");

         for (nJudge = 0; nJudge < strlen(pCurrent->szName); nJudge++)

         {

if ((pCurrent->szName[0] == '0') && (pCurrent->szName[1] == '\0'))

{

return NULL;

} 

             while (isascii((pCurrent->szName)[nJudge]))

             {

puts("名字输入出错，请输入中文名,返回请输入0");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

                 scanf("%s",pCurrent->szName);

                 system("cls");

                 nJudge = 0;

             }

         }

         puts("请输入学生年龄,返回请输入0");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

         scanf("%d",&(pCurrent->nAge));

if (pCurrent->nAge == 0)

{

return NULL;

}

         system("cls");

         puts("请输入学生绩点,返回请输入0");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

         scanf("%f",&(pCurrent->fGPA));

if (pCurrent->fGPA == 0)

{

return NULL;

}

         system("cls");

         puts("请输入学费,返回请输入0");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

         scanf("%f",&(pCurrent->fTuition));

if (pCurrent->fTuition == 0)

{

return NULL;

}

         system("cls");

         pCurrent->pNext = NULL;

         if (nCount == 0)

         {

              pHead = pPrev = pCurrent;

         }

         else

         {

             pPrev->pNext = pCurrent;

             pPrev = pCurrent;

         }

    }

    return pHead;

}

void WriteDataCover(STSI * pstParm)

{

     FILE * pFile;

     STSI * pstWDC;

     if ((pFile = fopen(gszFilename,"wb")) == NULL)

     {

         fputs("打开文档出错\n",stderr);

         exit(EXIT_FAILURE);

     }

     pstWDC = pstParm;

     while (pstWDC != NULL)

     {

          if (fwrite(pstWDC, STLEN, 1, pFile) != 1)

          {

              puts("写入数据出错\n");

              fclose(pFile);

              return;

          }

          pstWDC = pstWDC->pNext;

     }

     fclose(pFile);

}

void WriteDataAdd(STSI * pstParm)

{

     FILE * pFile;

     STSI * pstWDA;

     if ((pFile = fopen(gszFilename,"ab")) == NULL)

     {

         fputs("打开文档出错\n",stderr);

         exit(EXIT_FAILURE);

     }

     pstWDA = pstParm;

     while (pstWDA != NULL)

     {

         if (fwrite(pstWDA,STLEN,1,pFile) != 1)

         {

             puts("写入数据出错\n");

             fclose(pFile);

             return;

         }

         pstWDA = pstWDA->pNext;

     }

     fclose(pFile);

}

void MonPrint (void)

{

    time_t timer;

    timer = time (NULL);

    puts("    学生信息管理系统    ");

    puts("1、显 示    2、增 加");

    puts("3、查 询    4、修 改");

    puts("5、删 除    6、退 出");

    puts(ctime(&timer));

}

void InfoPrint (void)

{

     STSI * pstIP;

     int nJudge;

int nX,nY;

     pstIP = ReadData();

     if (pstIP == NULL)

     {

          printf("没有学生信息，请重新进入程序输入\n");

     }

     else

     {

          printf("学号   姓名   年龄   绩点   学费\n");

     }

     while (pstIP != NULL)

     {

         printf("  %d   %s   %d    %.1f    %.2f\n",pstIP->nStuNo,pstIP->szName,pstIP->nAge,pstIP->fGPA,pstIP->fTuition);

         pstIP = pstIP->pNext;

     }

     puts("重新进入学生信息管理系统请按1，退出请按0");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

     scanf("%d",&nJudge);

     system("cls");

     while ((nJudge != 1) && (nJudge != 0))

     {

        puts("输入有误，请重新输入。");

        puts("重新进入学生信息管理系统请按1，退出请按0");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

        scanf("%d",&nJudge);

system("cls");

     }

     if (nJudge == 0)

     {

        exit(EXIT_SUCCESS);

     }

}

void InfoAdd (void)

{

    int nAddNum;

    int nJudge;

int nX,nY;

    puts("需要增加几个学生的信息？");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

    scanf("%d",&nAddNum);

    system("cls");

    WriteDataAdd(CreatNode(nAddNum));

    puts("重新进入学生信息管理系统请按1，退出请按0");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

    scanf("%d",&nJudge);

    system("cls");

    while ((nJudge != 1) && (nJudge != 0))

    {

       puts("输入有误，请重新输入。");

       puts("进入学生信息管理系统请按1，退出请按0");

  nX = WhereX();

  nY = WhereY();

  gotoxy(nX,nY);

  system("cls");

    }

    if (nJudge == 0)

    {

       exit(EXIT_SUCCESS);

    }

}

void InfoSerch (void)

{

    int nSN;

    int nJudge;

int nX,nY;

    STSI * pstIS;

    STSI * pstPa;

    pstPa = pstIS = ReadData();

if (pstIS->pNext == NULL)

{

puts("没有学生信息,按任意键返回");

getchar();

return;

}

    puts("请输入学号,返回上级菜单请输入0");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

scanf("%d",&nSN);

if (nSN == 0)

{

return;

}

    system("cls");

    while (pstIS->nStuNo != nSN)

    {

         if((pstIS->pNext) == NULL)

         {

             puts("请输入正确的学号");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

             scanf("%d",nSN);

             system("cls");

             pstIS = pstPa;

         }

         else

         {

             pstIS = pstIS->pNext;

         }

    }

    puts("学号   姓名   年龄   绩点   学费");

    printf(" %d   %s   %d   %.1f   %.2f\n",pstIS->nStuNo,pstIS->szName,pstIS->nAge,pstIS->fGPA,pstIS->fTuition);

    puts("重新进入学生信息管理系统请按1，退出请按0");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

    scanf("%d",&nJudge);

    system("cls");

    while ((nJudge != 1) && (nJudge != 0))

    {

       puts("输入有误，请重新输入。");

       puts("重新进入学生信息管理系统请按1，退出请按0");

  nX = WhereX();

  nY = WhereY();

  gotoxy(nX,nY);

       scanf("%d",&nJudge);

  system("cls");

    }

    if (nJudge == 0)

    {

       exit(EXIT_SUCCESS);

    }

}

void InfoAlter (void)

{

    int nAN;

    int nSN;

    size_t nJudge;

int nX,nY;

    STSI * pstIS;

    STSI * pstPa;

    pstPa = pstIS = ReadData();

    puts("请输入学号,返回上级菜单请输入0");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

    scanf("%d",&nSN);

if (nSN == 0)

{

return;

}

system("cls");

if (pstIS->pNext == NULL)

{

puts("没有学生信息，按任意键返回上级菜单");

getchar();

return;

}

    while (pstIS->nStuNo != nSN)

    {

         if((pstIS->pNext) == NULL)

         {

             puts("请输入正确的学号");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

             scanf("%d",&nSN);

             pstIS = pstPa;

             system("cls");

         }

         else

         {

             pstIS = pstIS->pNext;

         }

    }

    puts("学号   姓名   年龄   绩点   学费");

    printf(" %d   %s   %d   %.1f   %.2f\n",pstIS->nStuNo,pstIS->szName,pstIS->nAge,pstIS->fGPA,pstIS->fTuition);

    puts("确认修改请按1,返回上级菜单请按0");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

    scanf("%d",&nAN);

if (nAN == 0)

{

return;

}

    system("cls");

    if (nAN)

    {

puts("全部修改请按0，修改姓名请按1");

puts("修改年龄请按2，修改绩点请按3");

puts("修改学费请按4");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

scanf("%d",&nJudge);

system("cls");

switch (nJudge)

{

case 0:

puts("请输入姓名");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

scanf("%s",pstIS->szName);

system("cls");

for (nJudge = 0; nJudge < strlen(pstIS->szName); nJudge++)

{

while (isascii((pstIS->szName)[nJudge]))

{

puts("名字输入出错，请输入中文名");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

scanf("%s",pstIS->szName);

system("cls");

nJudge = 0;

}

}

puts("请输入年龄");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

scanf("%d",&(pstIS->nAge));

system("cls");

puts("请输入绩点");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

scanf("%f",&(pstIS->fGPA));

system("cls");

puts("请输入学费");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

scanf("%f",&(pstIS->fTuition));

system("cls");

puts("输入成功");

break;

case 1:

puts("请输入姓名");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

scanf("%s",pstIS->szName);

break;

case 2:

puts("请输入年龄");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

scanf("%d",&(pstIS->nAge));

break;

case 3:

puts("请输入绩点");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

scanf("%f",&(pstIS->fGPA));

break;

case 4:

puts("请输入学费");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

scanf("%f",&(pstIS->fTuition));

break;

}      

}

system("cls");

    WriteDataCover(pstPa);

    puts("重新进入学生信息管理系统请按1，退出请按0");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

    scanf("%d",&nJudge);

    system("cls");

    while ((nJudge != 1) && (nJudge != 0))

    {

       puts("输入有误，请重新输入。");

       puts("重新进入学生信息管理系统请按1，退出请按0");

  nX = WhereX();

  nY = WhereY();

  gotoxy(nX,nY);

       scanf("%d",&nJudge);

  system("cls");

    }

    if (nJudge == 0)

    {

       exit(EXIT_SUCCESS);

    }

}

void InfoDelete()

{

    int nID;

    int nSN;

    int nJudge;

int nX,nY;

    FILE * pFile;

    STSI * pstHead;

    STSI * pstCurrent;

    STSI * pstPrev;

    puts("删除全部学生信息请按1,删除单个学生信息请按2，返回上级菜单请按0");

while (1)

{

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

scanf("%d",&nID);

system("cls");

if (nID == 1)

{

pFile = fopen(gszFilename,"wb");

fclose(pFile);

puts("已删除全部学生信息，返回上级菜单请按1，退出请按0");

while (1)

{

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

scanf("%d",&nJudge);

system("cls");

if (nJudge == 1)

{

return;

}

else if (nJudge == 0)

{

exit(EXIT_SUCCESS);

}

else

{

puts("输入有误，请重新输入");

puts("返回上级菜单请按，退出请按0");

}

}

}

if (nID == 2)

{

puts("请输入学号");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

   scanf("%d",&nSN);//cID = NumberControl();

system("cls");

pstHead = pstCurrent = ReadData();

pstPrev = pstCurrent->pNext;

while (pstPrev != NULL)

{

if (pstCurrent->nStuNo == nSN)

{

 WriteDataCover(pstPrev);

}

else if (pstPrev->nStuNo == nSN)

{

pstCurrent->pNext = pstPrev->pNext;

WriteDataCover(pstHead);

}

pstCurrent = pstCurrent->pNext;

pstPrev = pstPrev->pNext;

}

if (pstPrev == NULL)

{

pFile = fopen(gszFilename,"wb");

fclose(pFile);

}

puts("删除单个学生信息成功");

puts("返回上级菜单请按1，退出请按0");

while (1)

{

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

scanf("%d",&nJudge);

system("cls");

if (nJudge == 1)

{

return;

}

else if (nJudge == 0)

{

exit(EXIT_SUCCESS);

}

else

{

puts("输入有误，请重新输入");

puts("返回上级菜单请按，退出请按0");

}

}

}

if (nID == 0)

{

return;

}

else

{

puts("输入有误，请重新输入");

puts("删除全部学生信息请按1,删除单个学生信息请按2，返回上级菜单请按0");

}

}

}

int main (void)

{

    int nType;

int nX,nY;

    while(1)

    {

        system("cls");

        MonPrint();

        printf("请输入数字1-6  ");

nX = WhereX();

nY = WhereY();

gotoxy(nX,nY);

        scanf("%d",&nType);

system("cls");

        switch (nType)

        {

            case 1 :

                InfoPrint();

                break;

            case 2 :               

                InfoAdd();

                break;

            case 3 :

                InfoSerch();

                break;

            case 4 :

                InfoAlter();

                break;

            case 5 :

                InfoDelete();

                break;

            case 6 :

                exit(EXIT_SUCCESS);

            default :

                puts("输入有误，请重按任意健重新输入.");

                system("pasue");

                break;

            }

    }

    return 0;

}