用C语言做 学生成绩管理系统
用C语言做 学生成绩管理系统用不同的文件分别保存学生信息、课程信息和学生选课成绩信息，任何一门课的成绩由平时成绩（x%）、期中成绩（y%）和期末成绩（z%）的比例关系计算成总成绩(x+y+z=100)，均以100分制计算。程序要做到能对课程信息、学生信息和选课成绩信息进行增、删、改和查的功能，并能按总分进行升序或降序排列。系统以菜单方式工作。
新手求助哇！
一定要用TC运行过的。 急 急或者改如下程序也行
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<string.h>
#define N 100
int num=0,pl=1;
struct students
{
char name[20];
char sex[7];
long int ID;
float score[3];
float total;
}students[N],stu;
void save()
{
FILE *fp;
int i;
if((fp=fopen("E:\\students","wb"))==NULL)
{
printf("can not open the file:\n");
exit(0);
}
fputc(num,fp);
for(i=0;i<num;i++)
if(fwrite(&students[i],sizeof(struct
students),1,fp)!=1)
{
printf("flie can not be saved:\n");
exit(0);
}
fclose(fp);
}
void load()
{
FILE *fp;
int i;
if((fp=fopen("E:\\students","rb"))==NULL)
{
printf("can not open the file:\n");
exit(0);
}
num=fgetc(fp);
for(i=0;i<num;i++)
if(fread(&students[i],sizeof(struct
students),1,fp)!=1)
{
printf("can not read the file:\n");
exit(0);
}
fclose(fp);
}
void add()
{
FILE *fp;
if((fp=fopen("E:\\students","ab"))==NULL)
{
printf("can not open the file:\n");
exit(0);
}
if(fwrite(&students[pl],sizeof(struct
students),1,fp)!=1)
{
printf("can not read the file:\n");
exit(0);
}
fclose(fp);
}
void login()
{
system("cls");
int t,i,j,m;
long int k;
printf("\t\tPlease input to input information of the
number of students
:");
scanf("%d",&t);
srand((long)time(NULL));
for(i=0;i<t;i++)
{
num++;
printf("\t\tplease input the %d student's
message:\n",i+1);
printf("\t\tname:");
scanf("%s",students[i].name);
printf("\n\t\tsex:");
scanf("%s",students[i].sex);
printf("\n\t\tID:");
while(1)
{
m=0;
k=rand()%1000+2011000;
for(j=0;j<i;j++)
if(students[j].ID==k)
{
m=1;
break;
}
if(m==0)
break;
}
students[i].ID=k;
printf("%ld",students[i].ID);
printf("\n\t\tplease input the students
score:\n");
printf("\t\tEnglish\t\tMath\t\tComputer\n\t
\t");
students[i].total=0;
for(j=0;j<3;j++)
{
scanf("%f",&students[i].score[j]);
students[i].total+=students
[i].score[j];
}
}
printf("Press any key to return......");
save();
system("pause>null");
}
void scan()
{
load();
system("cls");
int i,j;
printf
("==========================================================
====================\n");
printf("Name gender student id English and math
computer
Total score
\n");
printf
("==========================================================
====================\n");
for(i=0;i<num;i++)
{
printf("%-12s%-8s%-5ld",students
[i].name,students[i].sex,students[i].ID);
for(j=0;j<3;j++)
printf(" %-5.2f",students
[i].score[j]);
printf("%10.2f",students[i].total);
printf("\n");
}
printf
("==========================================================
====================\n");
printf("Press any key to return........");
system("pause>null");
}
void find()
{
load();
system("cls");
int i,j,button,ID,m=0;
char name[20];
printf("\t\tPlease select a inquires the way: 1.
According to the student id inquires the \ t2. According to
name query
:\n");
printf("\t\t");
scanf("%d",&button);
switch(button)
{
case 1:
{
printf("\t\tplease input the student
ID:\n");
printf("\t\t");
scanf("%d",&ID);
for(i=0;i<num;i++)
if(ID==students[i].ID)
{
m=1;
printf("\t\tname:%s
\n\t\tsex:%s\n\t\tID:%d\n",students[i].name,students
[i].sex,students[i].ID);
printf("\n\t
\tEnglish score\t\tMath score\t\tComputer score\n");
for(j=0;j<3;j++)
printf("\t
\t%.2f\t",students[i].score[j]);
printf("\n");
}
if(m==0)
printf("\t\tsorry, no you
need to find the students' information!
");
}
break;
case 2:
{
printf("\t\tplease input the student
name:\n");
printf("\t\t");
scanf("%s",name);
for(i=0;i<num;i++)
if((strcmp(name,students
[i].name))==0)
{
m=1;
printf("\t\tname:%s
\n\t\tsex:%s\n\t\tID:%d\n",students[i].name,students
[i].sex,students[i].ID);
printf("\n\t
\tEnglish score\t\tMath score\t\tComputer score\n");
for(j=0;j<3;j++)
printf("\t
\t%.2f\t",students[i].score[j]);
printf("\n");
}
if(m==0)
printf("\t\tsorry,
no you need to find the students' information! ");
}
break;
}
printf("Press any key to return ......");
system("pause>null");
}
void sort()
{
load();
system("cls");
int i,j;
for(i=0;i<num-1;i++)
for(j=0;j<num-i-1;j++)
if(students[j].total<students[j
+1].total)
{
stu=students[j];
students[j]=students[j+1];
students[j+1]=stu;
}
printf
("==========================================================
==\n");
printf("Name gender student id
English and math score of computer
\n");
for(i=0;i<num;i++)
{
printf("%-8s%-6s%-5ld ",students
[i].name,students[i].sex,students[i].ID);
for(j=0;j<3;j++)
printf("%5.2f ",students
[i].score[j]);
printf(" %.2f",students[i].total);
printf("\n");
}
printf
("==========================================================
==\n");
printf("Press any key to return.........");
save();
system("pause>null");
}
void statistics()
{
load();
system("cls");
int i,key;
float sum,average,rate,min,max;
for(;;)
{
sum=0;
float a[5]={0};
while(1)
{
printf("\tPlease chioce(1-4):1.
Statistical English grade 2. Statistical mathematics result
3. Series
Computer program grades 4. Exit
\n");
printf("\t\t");
scanf("%d",&key);
if(1<=key&&key<=4)
{
key--;
break;
}
else
printf("\t\tIllegale
operation,plaese chioce(1-4)!");
}
if(key==3)
break;
for(i=0;i<num;i++)
{
if(90<=students[i].score[key])
a[0]++;
else if(80<=students[i].score[key])
a[1]++;
else if(70<=students[i].score[key])
a[2]++;
else if(60<=students[i].score[key])
a[3]++;
else
a[4]++;
sum+=students[i].score[key];
max=min=students[0].score[key];
if(max<students[i].score[key])
max=students[i].score[key];
if(min>students[i].score[key])
min=students[i].score[key];
}
average=sum/num;
a[0]=a[0]/num*100;
a[1]=a[1]/num*100;
a[2]=a[2]/num*100;
a[3]=a[3]/num*100;
a[4]=a[4]/num*100;
rate=a[0]+a[1]+a[2]+a[3];
printf("\t\taverage %.2f:\n",average);
printf("\t\tpass rate %.2f:\n",rate);
printf("\t\tmax score %.2f:\n",max);
printf("\t\tmin score %.2f:\n",min);
printf("\t\texcellent rate %.2f:\n",a[0]);
printf("\t\twell done rate %.2f:\n",a[1]);
printf("\t\tvery good rate %.2f:\n",a[2]);
printf("\t\tgood rate %.2f:\n",a[3]);
printf("\t\tpoor rate %.2f:\n",a[4]);
}
printf("Press any key to return......");
save();
system("pause>null");
}
void increase()
{
add();
system("cls");
int j,x,k;
srand((long)time(NULL));
printf("\t\tplease input the student message:\n");
printf("\t\tname:");
scanf("%s",students[num].name);
printf("\t\tsex:");
scanf("%s",students[num].sex);
printf("\t\tId:");
while(1)
{
x=0;
k=rand()%1000+2011000;
for(j=0;j<num;j++)
if(k==students[j].ID)
{
x=1;
break;
}
if(x==0)
break;
}
students[num].ID=k;
printf("%ld\n",students[num].ID);
printf("\n\t\tEnglish score\t\tMath score\t
\tComputer score\n");
students[num].total=0;
for(j=0;j<3;j++)
{
printf("\t\t");
scanf("%f",&students[num].score[j]);
students[num].total+=students
[num].score[j];
}
num++;
save();
printf("Add finished
，Press any key to return.......");
system("pause>null");
}
void amend()
{
load();
system("cls");
int i,j,key,x=1;
char name[20];
printf("\t\tplease input the student name:\n");
printf("\t\t");
scanf("%s",name);
for(i=0;i<num;i++)
if((strcmp(name,students[i].name))==0)
{
x=0;
break;
}
if(x==0)
{
printf("\t\tname:%s",students[i].name);
printf("\n\t\tsex:%s",students[i].sex);
printf("\n\t\tID:%ld",students[i].ID);
printf("\n\t\tEnglish \tMath \tcomputer
\n");
for(j=0;j<3;j++)
printf("\t\t%.2f",students[i].score
[j]);
printf("\n");
while(1)
{
printf("\t\tPlease choose you to
change the options: 1. The name 2. Gender 3. Student id 4.
Scores
5.out");
printf("\t\t");
scanf("%d",&key);
if(key==1)
{
printf("\t\tplaese input the
new name:\n");
printf("\t\t");
scanf("%s",students
[i].name);
}
else if(key==2)
{
printf("\t\tplease input the
new sex:\n");
printf("\t\t");
scanf("%s",students[i].sex);
}
else if(key==3)
{
printf("\t\tplease input the
new ID:\n");
printf("\t\t");
scanf("%ld",students[i].ID);
}
else if(key==4)
{
printf("\t\tplease input the
new score:\n");
printf("\t\tEnglish score\t
\tMath score\t\tComputer score\n");
for(j=0;j<3;j++)
scanf
("%.2f",students[i].score[j]);
}
else
break;
printf("The students' information
modify success!
\n");
save();
}
}
else
printf("\t\tNot find the student's
information
:\n");
printf("Press any key to return.....");
system("pause>null");
}
void deal()
{
load();
system("cls");
int i,j,x=1;
char name[20],ch;
printf("\t\tplease input the student name:\n");
printf("\t\t");
scanf("%s",name);
for(i=0;i<num;i++)
if(strcmp(name,students[i].name)==0)
{
x=0;
break;
}
if(x==0)
{
printf("%8s%8s%6s%9s%9s%12s%9s","1. The name
", "2. Student id", "3. Gender," "4. The English
Language ", "5. Mathematics," "6. Computer", "7. Total score
);
printf("\n");
printf("%8s%8ld%5s",students
[i].name,students[i].ID,students[i].sex);
for(j=0;j<3;j++)
printf(" %5.2f",students
[i].score[j]);
printf("%9.2f",students[i].total);
printf("\n");
printf("are you sure delete the student's
message:if you sure,press 'Y'or'y',or press 'N' or 'n'\n");
getchar();
ch=getchar();
if(ch=='Y'||ch=='y')
{
for(j=i;j<num;j++)
students[j]=students[j+1];
printf("The students' information
have been deleted!\n");
num--;
save();
}
}
else
printf("Not find the student's
information!");
printf("\n");
printf("Press any key to return.....");
system("pause>null");
}
void mnue()
{
system("cls");
printf
("**********************************************************
**************\n\n");
printf("-------------------------------Students'
information management system
-------------------------\n");
Printf (" \ t \ t1. Entry information \ t \ students
t \ t2. Browse information \ t \ students t \ n ");
Printf (" \ t \ t3. Search for students' information \ t \ t
\ t4. To the student information sort \ t \ t \ n ");
Printf (" \ t \ t5. Statistical information \ t \ students t
\ t6. Add student information \ t \ t \ n ");
Printf (" \ t \ t7. Modify the students information \ t \ t
\ t8. Delete student information \ t \ t \ n ");
Printf (" \ t \ t9. Quit: \ n ")
;
printf
("----------------------------------------------------------
----------------\n\n");
printf
("**********************************************************
****************\n");
}
void main()
{
int number,count=0;
while(1)
{
mnue();
printf("\t\tPlease input choose type
1--8:");
scanf("%d",&number);
switch(number)
{
case 1:login();break;
case 2:scan();break;
case 3:find();break;
case 4:sort();break;
case 5:statistics();break;
case 6:increase();break;
case 7:amend();break;
case 8:deal();break;
case 9:exit(0);
default :printf("\nThe
illegal operation:
\n");break;
}
}
}
