学生管理数组文件(C语言).pdf

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1、#include#include/for system(,cls,)#include#include/for getche()andgetch()/*定义学生结构体*/typedef struct/Student(char ID20;char Name20;float Math;float English;float Computer;float Average;float Sum;JStudent;/*声明学生数组及学生数量*/Student students1000;int num=0;/*求平均值*/float Avg(Student stu)return(stu.Math+stu.En

2、glish+stu.Computer)/3;)/*求总成绩*/float Sum(Student stu)(return(stu.Math+stu.English+stu.Computer);/*通过学号返回数组下标*/int Student_SearchBylndex(char id|)(int i;for(i=0;inum;i+)(if(strcmp(studentsi.ID,id)=O)(return i;)return-1;)/*显示单条学生记录*/void Student_DisplaySingle(int index)(printf(H%-8s%-8s%-10s%-10s%-15s

3、%-1 Os%-1 Osn”,“学号”，“姓名%数学成绩“J英语成绩7计算机成绩7平均成绩7总成绩”)；printf(-n)；printf(”8s%8s%10.2f%-10.2f%-15.2f%-10.2f%-10.2fn,studentsindex.ID,studentsindex.Name,studentsindex.Math,studentsindex.English,studentsindex.Computer,studentsindex.Average,studentsindex.Sum);)/*查找学生信息*/void Student_Search()(char id20;int

4、index;printf(请输入要查找的学生的学号scanf(%s,&id);getchar();index=Student_SearchBylndex(id);Student_DisplaySingle(index);)/*插入学生信息*/void Student_A|Dpend()(while(1)(printf(请输入学号:”)；scanf(”s”,&studentsnumD);getchar();printf(”请输入姓名:)；scanf(%sH,&studentsnum.Name);getcharQ;printf(请输入数学成绩:)；scanf(%f,&studentsnum.Mat

5、h);getchar();printf(请输入英语成绩:)；scanf(f,&studentsnum.English);getchar();printfC请输入计算机成绩scanfCf&studentstnuml.Computer);getchar();studentsnum.Average=Avg(studentsnum)；studentsnum.Sum=Sum(studentsnum);num+;printf(是否继续?(y/n)”);if(getchar()=n|getchar()=N,)break;)/*修改学生信息*/void Student_Modify()(float Math,

6、English,Computer;while(1)char id20;int index;printf(“请输入要修改的学生的学号scanf(%s,&id);getchar();index=Student_SearchBylndex(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7n);printf(”请输入学号:“)；scanf(%sn,&studentsindex.ID);getchar();printf(”请输入姓名scanf(

7、”s”,&studentsindex.Name);getchar();printf(”请输入成绩:)；scanfCf&studentsOndexJ.Math);getchar();printf(”请输入成绩:)；scanf(%f,&studentsindex.English);getchar();printf(”请输入成绩:)；scanf(%f,&studentsindex.Computer);getcharQ;studentsindex.Average=Avg(studentsindex);studentsindex.Sum=Sum(studentsindex)；)printf(是否继续?(

8、y/n);if(getchar()=n|getchar()=N,)(break;)/*删除学生信息*/void Student_Delete()(int i;while(1)(char id20;int index;printf(请输入要删除的学生的学号scanf(”s”,&id);getchar();index=Student_SearchBylndex(id);if(index=-1)printf(学生不存在!n。;)elseprintf(“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(getch

9、ar()=y)(for(i=index;inum-1;i+)(studentsi=studentsi+1;)num-;)getchar();)printf(是否继续?(y/n)1);if(getchar()=,n|getchar()=,N,)(break;)/*按总成绩降排序*/void descending_order_by_sum()int ij;Student tmp;for(i=0;inum;i+)(for(j=1;jnum-i;j+)(if(studentsO-1.SumstudentsO.Sum)(tmp=studentsj-1;students0-1=studentsj;stud

10、entsj=tmp;)/*按总成绩升排序*/void ascending_order_by_sum()(int ij;Student tmp;for(i=0;inum;i+)(for(j=1;jnum-i;j+)if(studentsO-1.SumstudentsO.Sum)tmp=studentsj-1;studentsO-1=studentsj;studentsj=tmp;)/*按学号降排序*/void descending_order_by_num()int i,j;Student tmp;for(i=0;inum;i+)(for(j=1;jnum-i;j+)(if(strcmp(stu

11、dentsO-1.ID,studentsO.ID)0)(tmp=studentsj-1;students0-1=studentsj;studentsj=tmp;)/*按学号升排序*/void ascending_order_by_num()(int i,j;Student tmp;for(i=0;inum;i+)for(j=1；jnum-i;j+)if(strcmp(studentsO-1.ID,studentsO.ID)0)(tmp=studentsj-1;studentsO-1=studentsO;studentsO=tmp;)/*显示学生信息*/void Student_List()in

12、t i;printf(H%-8s%-8s%-10s%-10s%-15s%-1 Os%-10sn7学号”，“姓名7 数学成绩“J英语成绩 计 算 机 成 绩 7 平均成绩*”总成绩)printf(-n)；for(i=0;inum;i+)(printf(”8s%8s%10.2f%-10.2f%-15.2f%-10.2f%-10.2fn,studentsi.ID,studentsi.Name,studentsi.Math,studentsi.English,studentsi.Computer,studentsi.Average,studentsi.Sum);)/*将学生信息从文件读出*/void

13、Read_File()(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;inum;i+)(fread(&studentsi,sizeof(Student),1,fp);)fclose(fp);/*将学生信息写入文件*/void Write_File()(FILE*fp;int i;if(fp=fopen(,Database.txt,Hwb)=NULL)printf(不能打开文件!n

14、”)；return;)if(fwrite(&num,sizeof(int),1,fp)!=1)(printf(写入文件错误!n”);)for(i=0;inum;i+)(if(fwrite(&studentsi,sizeof(Student),1,fp)!=1)(printf(“写入文件错误!n”)；)fclose(fp);)初始化void initialize(void)(int i=0;Read_File();for(i=0;i1000;i+)Read_File();strcpy(studentsi.ID,1);strcpy(studentsi.Name,);studentsi.Math=O

15、.O;studentsi.English=O.O;studentsi.Computer=0.0;studentsi.Average=O.O;studentsi.Sum=O.O;)/*主程序*/int main(void)char choice=AO,yes_no=O;initialize();while(1)(system(cls);主菜单*/printf(n Management forStudents scores n);printf(Hn-n)；printf(n|1.Append record|n”)；printf(|2.List recordH);printf(H|3.Delete r

16、ecordW);printfC1|4.Modify recordW);printf(H|5.Search recordW)；printf(n|6.Sort Score in descendingorder by sum|n);printf(|7.Sort Score in ascendingorder by sum|nH);printfC1 I 8.Sort Score in descendingorder by num|n);printf(H|9.Sort Score in ascendingorder by num|nn);printf(|W.Write to a File|n”)；pri

17、ntf(H|R.Read from aFile|n);printf(n|0.Exit|nH);printf(H-n)；printf(Please Input yourchoiceAn);choice=getche();switch(choice)(case T:printf(,nH);Student_Append();break;case 2:printfOn);Student_List();break;case 3:Student_Delete();break;case 4:printf(,nH);Student_Modify();break;case 5:printf(n);Student

18、_Search();break;case 6:printf(”n”)；descending_order_by_sum();Student_List();break;case 7:printf(,nH);ascending_order_by_sum();Student_List();break;case 8:printf(,nH);descending_order_by_num();Student_List();break;case 9:printf(”n”)；ascending_order_by_num();Student_List();break;case W:case W:Write_File();break;case r:case R:Read_File();break;case O:break;default:printf(H%c 为非法项！nH,choice);break;)if(choice=O)break;printf(Hn 要继续选择吗？(Y/N)?n);do(yes_no=getch();while(yes_no!=Y&yes_no!=V&yes_no!=N&yes_no!=h);while(yes_no=Y|yes_no=V);)