C语言大作业 成绩管理系统.docx
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C语言大作业 成绩管理系统.docx
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C语言大作业成绩管理系统
#include
#include
#include
#include
#defineN20
structstudent
{
charname[10];
intnum;
floatc;
floatmath;
floatenglish;
floataver;
floatsum;
}stu;
//菜单
voidmenu()/*便于操作员使用*/
{/*清屏*/
system("cls");
printf("*学生管理*\n");
printf("*=======================*\n");
printf("*1.成绩录入*\n");
printf("*2.查询*\n");
printf("*3.修改*\n");
printf("*4.插入*\n");
printf("*5.显示*\n");
printf("*6.统计*\n");
printf("*7.删除*\n");
printf("*0.退出*\n");
printf("*=======================*\n");
printf("*请选择相应201023701106的功能:
*\n");
}
//成绩录入
voidinput()
{
system("cls");
FILE*fp;
studentxs;/*定义一个结构体变量来装从文件中读出来201023701106的数据*/
if((fp=fopen("student.dat","ab"))==NULL)
{printf("can'topenfile!
\n");exit(0);}
printf("\n成绩录入");
printf("\n****************************************************");
printf("\n当输入姓名为ps结束录入\n");
while
(1)/*中间加油break,可使循环中断*/
{printf("\n请输入您201023701106的姓名:
");
scanf("%s",xs.name);
if(strcmp(xs.name,"ps")==0)break;/*判断姓名是否为ps,用字符串判断*/
printf("\n请输入学号:
");
scanf("%d",&xs.num);
printf("\n请输入c语言201023701106的成绩:
");
scanf("%f",&xs.c);
printf("\n请输入高数201023701106的成绩:
");
scanf("%f",&xs.math);
printf("\n请输入英语201023701106的成绩:
");
scanf("%f",&xs.english);
xs.aver=0;/*给平均分变量赋初值*/
xs.aver=(xs.c+xs.math+xs.english)/3;
xs.sum=0;
xs.sum=xs.c+xs.math+xs.english;
fwrite(&xs,sizeof(stu),1,fp);//将成绩信息写入文件
system("cls");
}
fclose(fp);
}
voidxingming()
{
FILE*fp;
studentxs;
charname[10];
printf("\n输入要查学生201023701106的姓名:
");scanf("%s",name);
if((fp=fopen("student.dat","rb"))==NULL)
{printf("can'topenfile!
\n");exit(0);}
while(!
feof(fp))
{
fread(&xs,sizeof(stu),1,fp);
if(strcmp(xs.name,name)==0)/*按姓名查询时判断输入201023701106的姓名是否存在,会循环从数据中找取*/
{
printf("\n学生201023701106的信息如下:
\n");
printf("\n%10s%6s%6s%6s%6s%6s%6s\n","姓名","学号","C语言","高数","英语","平均成绩","总分");
printf("\n%10%6d%6.2f%6.2f%6.2f%6.2f%6.2f\n",xs.name,xs.num,xs.c,xs.math,xs.english,xs.aver,xs.sum);
break;
}
}
if(feof(fp))
printf("\n查找失败");/*学生不存在*/
fclose(fp);
}
voidxuehao()
{
FILE*fp;
studentxs;
intnum;
printf("\n输入要查学生201023701106的学号:
");scanf("%d",&num);
if((fp=fopen("student.dat","rb"))==NULL)
{printf("can'topenfile!
\n");exit(0);}
while(!
feof(fp))
{
fread(&xs,sizeof(stu),1,fp);
if(xs.num==num)/*按学号查询时判断输入201023701106的学号是否存在,会循环从数据中找取*/
{
printf("\n学生201023701106的信息如下:
\n");
printf("\n%10s%6s%6s%6s%6s%6s%6s\n","姓名","学号","C语言","高数","英语","平均成绩","总分");
printf("\n%10s%6d%6.2f%6.2f%6.2f%6.2f%6.2f\n",xs.name,xs.num,xs.c,xs.math,xs.english,xs.aver,xs.sum);
break;
}
}
if(feof(fp))printf("\n查找失败");
fclose(fp);
}
//查询
voidsearch()
{
charch1;
system("cls");
printf("请输入按何种方式查询:
\n");
printf("\n1-姓名,2-学号:
");
ch1=getchar();/*用字符接收*/
switch(ch1)/*判断*/
{
case'1':
xingming();break;
case'2':
xuehao();break;
}
printf("\n按任意键返回主菜单");
getch();/*让屏幕停留同时按任意键返回*/
}
//修改:
输入学生201023701106的姓名,查找该学生,若找到则修改该生201023701106的成绩信息,并显示修改前后201023701106的结果;
voidmodi()
{
studentxs;
FILE*fp;
charname[10];
system("cls");
printf("\n输入要修改201023701106的学生201023701106的姓名:
");scanf("%s",name);
if((fp=fopen("student.dat","rb+"))==NULL)
{printf("can'topenfile!
\n");exit(0);}
while(!
feof(fp))
{
fread(&xs,sizeof(stu),1,fp);
if(strcmp(xs.name,name)==0)/*判断输入要修改201023701106的姓名是否存在*/
{
printf("修改前学生201023701106的信息如下:
\n");
printf("\n%10s%6s%6s%6s%6s%6s%6s\n","姓名","学号","C语言","高数","英语","平均成绩","总分");
printf("\n%10s%6d%6.2f%6.2f%6.2f%6.2f%6.2f\n",xs.name,xs.num,xs.c,xs.math,xs.english,xs.aver,xs.sum);
printf("\n请输入该生201023701106的C语言成绩:
");scanf("%f",&xs.c);
printf("\n高数成绩:
");scanf("%f",&xs.math);
printf("\n英语成绩:
");scanf("%f",&xs.english);
xs.aver=(xs.c+xs.math+xs.english)/3;
xs.sum=xs.c+xs.math+xs.english;
break;
}
}
if(!
feof(fp))
{
printf("\n修改后201023701106的学生201023701106的信息如下:
\n");
printf("\n%10s%6s%6s%6s%6s%6s%6s\n","姓名","学号","C语言","高数","英语","平均成绩","总分");
printf("\n%10s%6d%6.2f%6.2f%6.2f%6.2f%6.2f\n",xs.name,xs.num,xs.c,xs.math,xs.english,xs.aver,xs.sum);
fseek(fp,sizeof(stu),1);/*负号表示后退,1表示文件当前位置*/
fwrite(&xs,sizeof(stu),1,fp);/*再写入,同时把要修改201023701106的那个覆盖掉*/
}
else
printf("\n学生不存在,修改失败!
!
");
fclose(fp);
printf("\n按任意键返回主菜单");
getch();
}
//插入:
输入学生201023701106的平时201023701106的各项成绩,插入到指定位置;当指定201023701106的位置超出范围时,将其插入到全班201023701106的最后,并显示插入成功后201023701106的结果。
voidinsert()
{
inti=0,j,k,lenth;
FILE*fp;
students,xs[N];
system("cls");
printf("\n请输入插入201023701106的学生201023701106的姓名:
");scanf("%s",&s.name);
printf("\n学生201023701106的学号:
");scanf("%d",&s.num);
printf("\n学生201023701106的C成绩:
");scanf("%f",&s.c);
printf("\n高数成绩:
");scanf("%f",&s.math);
printf("\n英语成绩:
");scanf("%f",&s.english);
s.aver=(s.c+s.math+s.english)/3;
s.sum=s.c+s.math+s.english;
printf("\n插入位置:
");scanf("%d",&k);
//i=0;
if((fp=fopen("student.dat","rb"))==NULL)
{
printf("can'topenfile!
\n");exit(0);
}
while(!
feof(fp))
{
fread(&xs[i],sizeof(stu),1,fp);/*把数据读入到结构体数组中*/
if(feof(fp))break;
i++;
}
fclose(fp);
lenth=i;
if(k
{//插入
for(j=lenth-1;j>=k;j--)
xs[j+1]=xs[j];/*一开始j是最大201023701106的,往后移一个这样移动避免数据被覆盖*/
/*循环是只循环这一句201023701106的*/
xs[k]=s;/*将输入201023701106的学生信息加入这个k位置*/
lenth++;/*长度+1*/
//写回
if((fp=fopen("student.dat","wb"))==NULL)
{
printf("不能建立文件!
!
\n");exit(0);
}
for(i=0;i fwrite(&xs[i],sizeof(stu),1,fp); } else/*不再数组范围之内*/ { if((fp=fopen("student.dat","ab"))==NULL) { printf("不能建立文件! ! \n");exit(0); } fwrite(&s,sizeof(stu),1,fp); } printf("\n按任意键返回主菜单"); fclose(fp); } //显示 voidprint() { FILE*fp; students; system("cls"); if((fp=fopen("student.dat","rb"))==NULL) { printf("can'topenfile! \n");exit(0); } printf("学生成绩表"); printf("\n*****************************************************"); printf("\n%10s%s%6s%6s%6s%6s%6s\n","姓名","学号","C语言","高数","英语","平均成绩","总分"); while(! feof(fp)) { fread(&s,sizeof(stu),1,fp);//从文件中读取成绩信息 if(feof(fp))break;//判断是否文件尾 printf("\n%10s%6d%6.2f%6.2f%6.2f%6.2f%6.2f\n",s.name,s.num,s.c,s.math,s.english,s.aver,s.sum); } fclose(fp); printf("\n按任意键返回主菜单"); getch(); } //统计 voidtongji() { inti=0,j=0,k=0,l=0,m=0,n,p,q,r,t,u; FILE*fp; students[N],*p1[N],*p2[N],*p3[N],*p4[N];/*用指针数组*/ system("cls"); if((fp=fopen("student.dat","rb"))==NULL){printf("cant'topenfile! \n");exit(0);} while(! feof(fp)) { fread(&s[i++],sizeof(stu),1,fp);/*读入数据*/ if(feof(fp))break; } t=i;i=0; for(u=0;u { if(s[i].aver<60){p1[j++]=&s[i++];continue;}/*每个学生信息只能位于一个分数段*/ if(s[i].aver>=60&&s[i].aver<80){p2[k++]=&s[i++];continue;} if(s[i].aver>=80&&s[i].aver<90){p3[l++]=&s[i++];continue;} if(s[i].aver>=90){p4[m++]=&s[i++];continue;} } printf("学生成绩单"); printf("************************************************"); printf("\n不及格201023701106的人有: 姓名学号平均分\n"); for(n=0;n { printf("\n%10s%6d%6.2f\n",p1[n]->name,p1[n]->num,p1[n]->aver); } printf("\n60-79分201023701106的人有: 姓名学号平均分\n"); for(p=0;p { printf("\n%10%6d%6.2f\n",p2[p]->name,p2[p]->num,p2[p]->aver); } printf("\n80-89分201023701106的人有: 姓名学号平均分\n"); for(q=0;q { printf("\n%10s%6d%6.2f\n",p3[q]->name,p3[q]->num,p3[q]->aver); } printf("\n90以上201023701106的人有: 姓名学号平均分\n"); for(r=0;r { printf("\n%10s%6d%6.2f\n",p4[r]->name,p4[r]->num,p4[r]->aver); } fclose(fp); printf("\n按任意键返回主菜单"); getch(); } //删除: 输入学生姓名,若该学生存在,则删除,并显示删除后余下201023701106的学生成绩信息 voiddele() { studentxs[N]; FILE*fp; charname[10]; inti=0,len,k=-1/*k<0是为后面if判断用201023701106的*/; system("cls"); printf("\n输入要删除201023701106的学生姓名: ");scanf("%s",name); if((fp=fopen("student.dat","rb+"))==NULL) {printf("can'topenfile! \n");exit(0);} while(! feof(fp)) { fread(&xs[i],sizeof(stu),1,fp); if(feof(fp))break; if(strcmp(xs[i].name,name)==0)k=i; i++; } fclose(fp); //以下是删除后重新写文件 len=i;/*结构体数组上限*/ if(k>=0)/*k>0说明找到删除学生位置*/ { if((fp=fopen("student.dat","wb+"))==NULL) {printf("can'topenfile! \n");exit(0);} for(i=0;i { if(i==k)continue;/*从这个位置开始写入*/ fwrite(&xs[i],sizeof(stu),1,fp); } fclose(fp); } else{printf("\n删除失败\n");getch();}/*失败后重新返回菜单*/ printf("\n按任意键返回主菜单"); print(); } //菜单选择 voidmain() { charch; while (1) { menu();//显示菜单 ch=getch();//选择菜单 if(ch=='0')break; switch(ch)//判断功能项 { case'1': input();break; case'2': search();break; case'3': modi();break; case'4': insert();break; case'5': print();break; case'6': tongji();break; case'7': dele();break; } } printf("\n谢谢使用\n"); }
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