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C语言课程设计之学生成绩简单管理程序 第2页

更新时间:2007-10-22:  来源:毕业论文

Statistic(Student stud[],int n)            /*新增功能,输出统计信息*/

{

                    int i,j=0,k=0,sum=0;

                    float aver;            /*成绩平均值*/

                    for(i=0;i<n;i++)            /*循环输入判断*/

                             {

                              sum+=stud[i].score;

                              if(stud[j].score>stud[i].score) j=i;

                              if(stud[k].score<stud[i].score) k=i;

                             }

                    aver=1.0*sum/n;

                    printf("\t\t\tthere are %d records.\n",n);            /*总共记录数*/

                    printf("\t\t\tthe hignest score:\n");           /*最高分*/

                    printf("\t\t\tnumber:%s   name:%s   score:%d\n",stud[j].num,stud[j].name,stud[j].score);

                    printf("\t\t\tthe lowest score:\n");            /*最低分*/

                    printf("\t\t\tnumber:%s   name:%s   score:%d\n",stud[k].num,stud[k].name,stud[k].score);

                    printf("\t\t\tthe average score is %5.2f\n",aver);                  /*平均分*/

}

 

int AddfromText(Student stud[],int n)               /*从文件中读入数据*/

{

                    int i=0,num;

                    FILE *fp;            /*定义文件指针*/

                    char filename[20];                  /*定义文件名*/

                    printf("\t\t\tInput the filename:");

                    scanf("\t\t\t%s",filename);              /*输入文件名*/

                    if((fp=fopen(filename,"rb"))==NULL)             /*打开文件*/

                             {

                                       printf("\t\t\tcann't open the file\n");                  /*打开失败信息*/

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

                                       system("pause");

                                       return(n);

                             }

                fscanf(fp,"%d",&num);                  /*读入总记录量*/

                    while(i<num)                /*循环读入数据*/

                    {

                             fscanf(fp,"%s%s%d",stud[n+i].num,stud[n+i].name,&stud[n+i].score);

                             i++;

                }

                    n+=num;

                    fclose(fp);           /*关闭文件*/

                    printf("\t\t\tSuccessed!\n");

                    printf("\t\t\t");

                    system("pause");

                    return(n);

}

 

void WritetoText(Student stud[],int n)               /*将所有记录写入文件*/

{

 int i=0;

 FILE *fp;           /*定义文件指针*/

 char filename[20];                 /*定义文件名*/

                    printf("\t\t\tWrite Records to a Text File\n");             /*输入文件名*/

                    printf("\t\t\tInput the filename:");

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

                    if((fp=fopen(filename,"w"))==NULL)             /*打开文件*/

                             {

                                       printf("\t\t\tcann't open the file\n");

                                       system("pause");

                                       return;

                             }

                fprintf(fp,"%d\n",n);             /*循环写入数据*/

                    while(i<n)

                    {

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

                             i++;

                }

                    fclose(fp);           /*关闭文件*/

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

}

 

void main()           /*主函数*/

{

 int n=0;

                    for(;;)

                    {

                             switch(menu_select())           /*选择判断*/

                             {

                             case 1:

                                       printf("\t\t\tInput Records\n");                /*输入若干条记录*/

                                       n=Input(stu,n);

                                       break;

                             case 2:

                                       printf("\t\t\tDisplay All Records\n");                /*显示所有记录*/

                                       Display(stu,n);

                                       break;

                             case 3:

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

                                       Sort_by_num(stu,n);             /*按学号排序*/

                                       printf("\t\t\tSort Suceessed!\n");

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

                                       system("pause");

                                       break;

                             case 4:

                                       printf("\t\t\tInsert a Record\n");

                                       n=Insert_a_record(stu,n);               /*插入一条记录*/

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

                                       system("pause");

                                       break;

                             case 5:

                                       printf("\t\t\tDelete a Record\n");

                                       n=Delete_a_record(stu,n);              /*按姓名查找,删除一条记录*/

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

                                       system("pause");

                                       break;

                             case 6:

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

                                       Query_a_record(stu,n);                  /*查找并显示一个记录*/

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

                                       system("pause");

                                       break;

                             case 7:

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

                                       Statistic(stu,n);             /*新增功能,输出统计信息*/

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

                                       system("pause");

                                       break;

                             case 8:

                                       printf("\t\t\tAdd Records from a Text File\n");

                                       n=AddfromText(stu,n);                  /*新增功能,输出统计信息*/

                                       break;

                             case 9:

                                       printf("\t\t\tWrite to a Text file\n");

                                       WritetoText(stu,n);                /*循环写入数据*/

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

                                       system("pause");

                                       break;

                             case 0:

                                       printf("\t\t\tHave a Good Luck,Bye-bye!\n");           /*结束程序*/

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

                                       system("pause");

                                       exit(0);

                             }

                    }

}

 

4 .函数调用关系图

Reverse(head)函数

按学号排序

5.设计测试流程

 

1、进入界面

  

2、输入选项1,回车;

  按提示输入数据:

 

3、回到主菜单;

  输入选项7,回车;

   输入文件名:data.txt,回车;

   出现成功提示,则读入文件操作成功。

 

   4、回到主菜单,输入2,回车

          10个暂停显示数据

5、回到主菜单,输入3,回车

   出现排序成功信息。

 

6、回到主菜单,输入4,回车

   按提示插入一组数据

 

7、回到主菜单,输入5,回车

   按提示输入姓名,删除数据

   出现删除成功的信息

 

 

8、回到主菜单,输入6,回车

   输入姓名进行查询

 

9、回到主菜单,输入7,回车

   出现统计信息

 

10、回到主菜单

,输入9,回车

输入result.txt,回车

出现成功写入文件的信息

 

11、回到主菜单,输入0,回车退出系统

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