#include<stdio.h>                   /*引用庫函數(shù)*/

#include<stdlib.h>

#include<ctype.h>

#include<string.h>

 

typedef struct                /*定義結(jié)構(gòu)體數(shù)組*/

{

                    char num[10];               /*學(xué)號(hào)*/

                    char name[20];              /*姓名*/

                    int score;             /*成績*/

}Student;

Student stu[80];             /*結(jié)構(gòu)體數(shù)組變量*/

 

int menu_select()           /*菜單函數(shù)*/

{

                    char c;

                    do{

                             system("cls");              /*運(yùn)行前清屏*/

                             printf("\t\t****Students' Grade Management System****\n");            /*菜單選擇*/

                             printf("\t\t    | 1. Input Records             |\n");

                             printf("\t\t    | 2. Display All Records                |\n");

                             printf("\t\t    | 3. Sort                                      |\n");

                             printf("\t\t    | 4. Insert a Record                |\n");

                             printf("\t\t    | 5. Delete a Record            |\n");

                             printf("\t\t    | 6. Query                     |\n");

                             printf("\t\t    | 7. Statistic                 |\n");

                             printf("\t\t    | 8. Add Records from a Text File|\n");

                             printf("\t\t    | 9. Write to a Text file          |\n");

                             printf("\t\t    | 0. Quit                                     |\n");

                             printf("\t\t*****************************************\n");

                             printf("\t\t\tGive your Choice(0-9):");

                             c=getchar();                  /*讀入選擇*/

                    }while(c<'0'||c>'9');

                    return(c-'0');                  /*返回選擇*/

}

 

int Input(Student stud[],int n)                  /*輸入若干條記錄*/

{int i=0;

 char sign,x[10];            /*x[10]為清除多余的數(shù)據(jù)所用*/

 while(sign!='n'&&sign!='N')          /*判斷*/

 {

                     printf("\t\t\tstudent's num:");                 /*交互輸入*/

                     scanf("\t\t\t%s",stud[n+i].num);

                     printf("\t\t\tstudent's name:");

                     scanf("\t\t\t%s",stud[n+i].name);

                     printf("\t\t\tstudent's score:");

                     scanf("\t\t\t%d",&stud[n+i].score);

                     gets(x);              /*清除多余的輸入*/

                     printf("\t\t\tany more records?(Y/N)");

                     scanf("\t\t\t%c",&sign);                /*輸入判斷*/

                     i++;

 }

 return(n+i);

}

 

void Display(Student stud[],int n)            /*顯示所有記錄*/

{

 int i;

 printf("\t\t\t-----------------------------------\n");          /*格式頭*/

 printf("\t\t\tnumber          name          score\n");

 printf("\t\t\t-----------------------------------\n");

 for(i=1;i<n+1;i++)                /*循環(huán)輸入*/

 {

                    printf("\t\t\t%-16s%-15s%d\n",stud[i-1].num,stud[i-1].name,stud[i-1].score);

                    if(i>1&&i%10==0)               /*每十個(gè)暫停*/

                             {printf("\t\t\t-----------------------------------\n");                  /*格式*/

                              printf("\t\t\t");

                              system("pause");

                              printf("\t\t\t-----------------------------------\n");

                             }

 }

 printf("\t\t\t");

 system("pause");

}

 

void Sort_by_num(Student stud[],int n)            /*按學(xué)號(hào)排序*/

{

                    int i,j,*p,*q,s;

                    char t[10];

                    for(i=0;i<n-1;i++)                  /*冒泡法排序*/

                             for(j=0;j<n-1-i;j++)

                                       if(strcmp(stud[j].num,stud[j+1].num)>0)

                                       {strcpy(t,stud[j+1].num);

                                        strcpy(stud[j+1].num,stud[j].num);

                                        strcpy(stud[j].num,t);

                                        strcpy(t,stud[j+1].name);

                                        strcpy(stud[j+1].name,stud[j].name);

                                        strcpy(stud[j].name,t);

                                        p=&stud[j+1].score;

                                        q=&stud[j].score;

                                        s=*p;

                                        *p=*q;

                                        *q=s;

                                       }

}

 

int Insert_a_record(Student stud[],int n)            /*插入一條記錄*/

{char x[10];          /*清除多余輸入所用*/

                    printf("\t\t\tstudent's num:");                   /*交互式輸入*/

                    scanf("\t\t\t%s",stud[n].num);

                    printf("\t\t\tstudent's name:");

                    scanf("\t\t\t%s",stud[n].name);

                    printf("\t\t\tstudent's score:");

                    scanf("\t\t\t%d",&stud[n].score);

                    gets(x);

                    n++;

                    Sort_by_num(stud,n);           /*調(diào)用排序函數(shù)*/

                    printf("\t\t\tInsert Successed!\n");           /*返回成功信息*/

                    return(n);

}

 

int Delete_a_record(Student stud[],int n)           /*按姓名查找，刪除一條記錄*/

{

                    char s[20];

                    int i=0,j;

                    printf("\t\t\ttell me his(her) name:");                 /*交互式問尋*/

                    scanf("%s",s);

                    while(strcmp(stud[i].name,s)!=0&&i<n) i++;           /*查找判斷*/

                    if(i==n)

                             {

                              printf("\t\t\tnot find!\n");              /*返回失敗信息*/

                              return(n);

                             }

                    for(j=i;j<n-1;j++)                   /*刪除操作*/

                             {

                              strcpy(stud[j].num,stud[j+1].num);

                              strcpy(stud[j].name,stud[j+1].name);

                              stud[j].score=stud[j+1].score;

                             }

                    printf("\t\t\tDelete Successed!\n");          /*返回成功信息*/

                    return(n-1);

}

 

void Query_a_record(Student stud[],int n)                 /*查找并顯示一個(gè)記錄*/

{

                    char s[20];

                    int i=0;

                    printf("\t\t\tinput his(her) name:");                   /*交互式輸入*/

                    scanf("\t\t\t%s",s);

                    while(strcmp(stud[i].name,s)!=0&&i<n) i++;           /*查找判斷*/

                    if(i==n)

                             {