Question

用C语言设计一个“学生成绩的管理系统”

求编写一个通用的管理系统。现在有很多管理系统，如“图书管理系统”、“医疗管理系统”、“学生成绩管理系统”等。这些管理系统其基本功能大多相同，包含“添加”、“删除”、“修改”、“排序”等操作。针对这一现状，要求通过配置文件来指定特定的管理系统，从而实现一个通用的管理系统，在不改变程序代码的前提下，实现一个配置文件所指定的管理系统功能。

Answer 1

#include"stdio.h"/*定义学生结构体*/struct Student{char()ID[20];char()Name[20];float Mark1;float Mark2;float Mark3;float Average;};/*声明学生数组及学生数量*/struct Student students[1000];int num=0;/*求平均值*/float Avg(struct Student stu){return(stu.Mark1+stu.Mark2+stu.Mark3)/3;}/*通过学号返回数组下标*/int Student_SearchByIndex(char()id[]){int i;for(i=0;i<num;i++){if(strcmp(students[i].ID,id)==0){return i;}}return-1;}/*通过姓名返回数组下标*/int Student_SearchByName(char name[]){int i;for(i=0;i<num;i++){if(strcmp(students[i].Name,name)==0){return i;}}return-1;}/*显示单条学生记录*/void Student_DisplaySingle(int index){printf("%10s%10s%8s%8s%8s%10s\n","学号","姓名","成绩","成绩","成绩","平均成绩");printf("-------------------------------------------------------------\n");printf("%10s%10s%8.2f%8.2f%8.2f%10.2f\n",students[index].ID,students[index].Name,students[index].Mark1,students[index].Mark2,students[index].Mark3,students[index].Average);}/*插入学生信息*/void Student_Insert(){while(1){printf("请输入学号:");scanf("%s",&students[num].ID);getchar()();printf("请输入姓名:");scanf("%s",&students[num].Name);getchar()();printf("请输入成绩:");scanf("%f",&students[num].Mark1);getchar()();printf("请输入成绩:");scanf("%f",&students[num].Mark2);getchar();printf("请输入成绩:");scanf("%f",&students[num].Mark3);getchar();students[num].Average=Avg(students[num]);num++;printf("是否继续?(y/n)");if(getchar()=='n'){break;}}}/*修改学生信息*/void Student_Modify(){float mark1,mark2,mark3;while(1){char id[20];int index;printf("请输入要修改的学生的学号:");scanf("%s",&id);getchar();index=Student_SearchByIndex(id);if(index==-1){printf("学生不存在!\n");}else{printf("你要修改的学生信息为:\n");Student_DisplaySingle(index);printf("--请输入新值--\n");printf("请输入学号:");scanf("%s",&students[index].ID);getchar();printf("请输入姓名:");scanf("%s",&students[index].Name);getchar();printf("请输入成绩:");scanf("%f",&students[index].Mark1);getchar();printf("请输入成绩:");scanf("%f",&students[index].Mark2);getchar();printf("请输入成绩:");scanf("%f",&students[index].Mark3);getchar();students[index].Average=Avg(students[index]);}printf("是否继续?(y/n)");if(getchar()=='n'){break;}}}/*删除学生信息*/void Student_Delete(){int i;while(1){char id[20];int index;printf("请输入要删除的学生的学号:");scanf("%s",&id);getchar();index=Student_SearchByIndex(id);if(index==-1){printf("学生不存在!\n");}else{printf("你要删除的学生信息为:\n");Student_DisplaySingle(index);printf("是否真的要删除?(y/n)");if(getchar()=='y'){for(i=index;i<num-1;i++){students[i]=students[i+1];}num--;}getchar();}printf("是否继续?(y/n)");if(getchar()=='n'){break;}}}/*按姓名查询*/void Student_Select(){while(1){char name[20];int index;printf("请输入要查询的学生的姓名:");scanf("%s",&name);getchar();index=Student_SearchByName(name);if(index==-1){printf("学生不存在!\n");}else{printf("你要查询的学生信息为:\n");Student_DisplaySingle(index);}printf("是否继续?(y/n)");if(getchar()=='n'){break;}}}/*按平均值排序*/void Student_SortByAverage(){int i,j;struct Student tmp;for(i=0;i<num;i++){for(j=1;j<num-i;j++){if(students[j-1].Average<students[j].Average){tmp=students[j-1];students[j-1]=students[j];students[j]=tmp;}}}}/*显示学生信息*/void Student_Display(){int i;printf("%10s%10s%8s%8s%8s%10s\n","学号","姓名","成绩","成绩","成绩","平均成绩");printf("-------------------------------------------------------------\n");for(i=0;i<num;i++){printf("%10s%10s%8.2f%8.2f%8.2f%10.2f\n",students[i].ID,students[i].Name,students[i].Mark1,students[i].Mark2,students[i].Mark3,students[i].Average);}}/*将学生信息从文件读出*/void IO_ReadInfo(){FILE*fp;int i;if((fp=fopen("Database.txt","rb"))==NULL){printf("不能打开文件!\n");return;}if(fread(&num,sizeof(int),1,fp)!=1){num=-1;}else{for(i=0;i<num;i++){fread(&students[i],sizeof(struct Student),1,fp);}}fclose(fp);}/*将学生信息写入文件*/void IO_WriteInfo(){FILE*fp;int i;if((fp=fopen("Database.txt","wb"))==NULL){printf("不能打开文件!\n");return;}if(fwrite(&num,sizeof(int),1,fp)!=1){printf("写入文件错误!\n");}for(i=0;i<num;i++){if(fwrite(&students[i],sizeof(struct Student),1,fp)!=1){printf("写入文件错误!\n");}}fclose(fp);}/*主程序*/main(){int choice;IO_ReadInfo();while(1){/*主菜单*/printf("\n------学生成绩管理系统------\n");printf("1.增加学生记录\n");printf("2.修改学生记录\n");printf("3.删除学生记录\n");printf("4.按姓名查询学生记录\n");printf("5.按平均成绩排序\n");printf("6.退出\n");printf("请选择(1-6):");scanf("%d",&choice);getchar();switch(choice){case 1:Student_Insert();break;case 2:Student_Modify();break;case 3:Student_Delete();break;case 4:Student_Select();break;case 5:Student_SortByAverage();Student_Display();break;case 6:exit();break;}IO_WriteInfo();}}

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能不能格式弄好，看不懂