学生管理数组文件(C语言)

#include<stdio.h>

#include<stdlib.h>//forsystem(,,cls,')

#include<string.h>

#include<conio.h>//forgetche()and

getch()

/*定义学生结构体*/

typedefstruct//Student

(

charID[20];

charName[20];

floatMath;

floatEnglish;

floatComputer;

floatAverage;

floatSum;

JStudent;

/*声明学生数组及学生数量*/

Studentstudents[1000];

intnum=0;

/*求平均值*/

floatAvg(Studentstu)

return

(stu.Math+stu.English+stu.Computer)/3;

)

/*求总成绩*/

floatSum(Studentstu)

(

return

(stu.Math+stu.English+stu.Computer);

/*通过学号返回数组下标*/

intStudent_SearchBylndex(charid[|)

(

inti;

for(i=0;i<num;i++)

(

if(strcmp(students[i].ID,id)==O)

(

returni;

)

)

return-1;

)

/*显示单条学生记录*/

voidStudent_DisplaySingle(intindex)

(

printf(H%-8s%-8s%-10s%-10s%-15s%-1Os

%-1Os\n”,“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%-10.2f\n',,students[index].ID,studen

ts[index].Name,

students[index].Math,students[index].Engli

sh,students[index].Computer,students[ind

ex].Average,students[index].Sum);

)

/*查找学生信息*/

voidStudent_Search()

(

charid[20];

intindex;

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*/

voidStudent_A|Dpend()

(

while(1)

(

printf("请输入学号:”)；

scanf(”％s”,&students[num]」D);

getchar();

printf(”请输入姓名:")；

scanf("%sH,&students[num].Name);

getcharQ;

printf("请输入数学成绩:")；

scanf("%f,,&students[num].Math);

getchar();

printf("请输入英语成绩:")；

scanf("％f',&students[num].English);

getchar();

printfC请输入计算机成绩

scanfC^f\&studentstnuml.Computer);

getchar();

students[num].Average=Avg(students[nu

m])；

students[num].Sum=Sum(students[num]);

num++;

printf("是否继续?(y/n)”);

if(getchar()=='n'||getchar()=='N,)

break;

)

)

)

/*修改学生信息*/

voidStudent_Modify()

(

floatMath,English,Computer;

while(1)

charid[20];

intindex;

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,&students[index].ID);

getchar();

printf(”请输入姓名

scanf(”％s”,&students[index].Name);

getchar();

printf(”请输入成绩:")；

scanfC^f\&studentsOndexJ.Math);

getchar();

printf(”请输入成绩:")；

scanf("%f,,&students[index].English);

getchar();

printf(”请输入成绩:")；

scanf("%f',&students[index].Computer);

getcharQ;

students[index].Average=Avg(students[ind

ex]);

students[index].Sum=Sum(students[index]

)；

)

printf("是否继续?(y/n)");

if(getchar()=='n'||getchar()=='N,)

(

break;

)

)

)

/*删除学生信息*/

voidStudent_Delete()

(

inti;

while(1)

(

charid[20];

intindex;

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。;

)

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)1');

if(getchar()==,n'||getchar()==,N,)

(

break;

)

)

)

/*按总成绩降排序*/

voiddescending_order_by_sum()

intij;

Studenttmp;

for(i=0;i<num;i++)

(

for(j=1;j<num-i;j++)

(

if(studentsO-1].Sum<studentsO].Sum)

(

tmp=students[j-1];

students0-1]=students[j];

students[j]=tmp;

)

)

}

)

/*按总成绩升排序*/

voidascending_order_by_sum()

(

intij;

Studenttmp;

for(i=0;i<num;i++)

(

for(j=1;j<num-i;j++)

if(studentsO-1].Sum<studentsO].Sum)

tmp=students[j-1];

studentsO-1]=students[j];

students[j]=tmp;

)

)

)

)

/*按学号降排序*/

voiddescending_order_by_num()

inti,j;

Studenttmp;

for(i=0;i<num;i++)

(

for(j=1;j<num-i;j++)

(

if

(strcmp(studentsO-1].ID,studentsO].ID)<0)

(

tmp=students[j-1];

students0-1]=students[j];

students[j]=tmp;

)

)

}

)

/*按学号升排序*/

voidascending_order_by_num()

(

inti,j;

Studenttmp;

for(i=0;i<num;i++)

for(j=1；j<num-i;j++)

if

(strcmp(studentsO-1].ID,studentsO].ID)<0)

(

tmp=students[j-1];

studentsO-1]=studentsO];

studentsO]=tmp;

)

)

)

/*显示学生信息*/

voidStudent_List()

inti;

printf(H%-8s%-8s%-10s%-10s%-15s%-1Os

%-10s\n7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;i<num;i++)

(

printf(”％・8s%・8s%・10.2f%-10.2f%-15.2f%

-10.2f%-10.2f\n",students[i].ID,students[i].

Name,

students[i].Math,students[i].English,studen

ts[i].Computer,students[i].Average,student

s[i].Sum);

)

)

/*将学生信息从文件读出*/

voidRead_File()

(

FILE*fp;

inti;

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(Student),1,fp);

)

)

fclose(fp);

/*将学生信息写入文件*/

voidWrite_File()

(

FILE*fp;

inti;

if

((fp=fopen(',Database.txt",Hwb"))==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(Student),1,fp)!=

1)

(

printf(“写入文件错误!\n”)；

}

)

fclose(fp);

)

〃初始化

voidinitialize(void)

(

inti=0;

Read_File();

for(i=0;i<1000;i++)

Read_File();

strcpy(students[i].ID,'1");

strcpy(students[i].Name,"");

students[i].Math=O.O;

students[i].English=O.O;

students[i].Computer=0.0;

students[i].Average=O.O;

students[i].Sum=O.O;

)

)

/*主程序*/

intmain(void)

charchoice=AO',yes_no='\O';

initialize();

while(1)

(

system("cls");

〃主菜单*/

printf("\nManagementfor

Students'scores\n");

printf(H\n

-----------------------------------------------\n»)；

printf(n|1.Appendrecord

|\n”)；

printf("|2.Listrecord

H);

printf(H|3.Deleterecord

W);

printfC1|4.Modifyrecord

W);

printf(H|5.Searchrecord

W)；

printf(n|6.SortScoreindescending

orderbysum|\n");

printf("|7.SortScoreinascending

orderbysum|\nH);

printfC1I8.SortScoreindescending

orderbynum|\n");

printf(H|9.SortScoreinascending

orderbynum|\nn);

printf("|W.WritetoaFile

|\n”)；

printf(H|R.Readfroma

File|\n");

printf(n|0.Exit

|\nH);

printf(H

-----------------------------------------------\n")；

printf("PleaseInputyour

choiceAn");

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;

case5:

printf("\n");

Student_Search();

break;

ca