C语言版学生成绩管理系统

本文实例为大家分享了C语言版学生成绩管理系统的具体代码，供大家参考，具体内容如下

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#include<stdio.h>

#include<stdlib.h>

#include<time.h>

#include<conio.h>

#include<string.h>

#include<algorithm>

char buf[255];

char c=14;

char path[]="D:\\\\data";

char tmp[]="D:\\\\tmp";

struct Student

{

char Name[20];

char No[20];

char Dept[20];

char ClassNo[20];

double Math,Chinese,English;

double Ave;

bool Pass;

}students[500];

bool cmp1(Student s1,Student s2)

{

return s1.Chinese>s2.Chinese;

}

bool cmp2(Student s1,Student s2)

{

return s1.Math>s2.Math;

}

bool cmp3(Student s1,Student s2)

{

return s1.English>s2.English;

}

bool cmp4(Student s1,Student s2)

{

return s1.Ave>s2.Ave;

}

//---------------------------------------------------------void Sort(int cmd)

/*

1 ChineseSort

2 MathSort

3 EnglishSort

4 AveSort

*/

int Sort(int cmd)

{

Student stu;

FILE *fp=fopen(path,"ab+");

int n,cnt=0;

while((n=fread(&stu,sizeof(stu),1,fp)>0))

{

students[cnt++]=stu;

}

fclose(fp);

switch(cmd)

{

case 1:

std::sort(students,students+cnt,cmp1);

break;

case 2:

std::sort(students,students+cnt,cmp2);

break;

case 3:

std::sort(students,students+cnt,cmp3);

break;

case 4:

std::sort(students,students+cnt,cmp4);

break;

default:

exit(0);

}

return cnt;

}

//---------------------------------------------------------PrintTitle()

void PrintTitle()

{

printf("%-8s%-12s%-12s%-8s%-7s%-7s%-7s%-7s%-s\\n","姓名","班级","学号","系院","语文","数学","英语","平均分","及格");

}

//---------------------------------------------------------Print(Student stu)

void Print(Student stu)

{

printf("%-8s%-12s%-12s%-8s%-7.2lf%-7.2lf%-7.2lf%-7.2lf%-s\\n",stu.Name,stu.ClassNo,stu.No,stu.Dept,stu.Chinese,stu.Math,stu.English,stu.Ave,stu.Pass?"是":"否");

}

//---------------------------------------------------------PrintNo(char No[])

void PrintNo(char No[])

{

Student stu;

int n;

bool find=0;

FILE *fp=fopen(path,"ab+");//以ab+方式打开防止data文件不存在时发生错误

while((n=fread(&stu,sizeof(stu),1,fp))>0)

{

if(!strcmp(stu.No,No))

{

find=1;

break;

}

fclose(fp);

if(find)

{

PrintTitle();

Print(stu);

}

else

puts("未找到！");

}

//---------------------------------------------------------PrintClass(char ClassNo[])

void PrintClass(char ClassNo[])

{

Student stu;

FILE *fp=fopen(path,"ab+");

int n,cnt=0;

while((n=fread(&stu,sizeof(stu),1,fp)>0))

{

if(!strcmp(stu.ClassNo,ClassNo))

{

if(cnt==0)

PrintTitle();

Print(stu);

cnt++;

}

fclose(fp);

if(cnt==0)

puts("无数据");

else

printf("共%d条\\n",cnt);

}

//---------------------------------------------------------PrintDept(char Dept[])

void PrintDept(char Dept[])

{

Student stu;

FILE *fp=fopen(path,"ab+");

int n,cnt=0;

while((n=fread(&stu,sizeof(stu),1,fp)>0))

{

if(!strcmp(stu.Dept,Dept))

{

if(cnt==0)

PrintTitle();

Print(stu);

cnt++;

}

fclose(fp);

if(cnt==0)

puts("无数据");

else

printf("共%d条\\n",cnt);

}

//---------------------------------------------------------PrintAll()

void PrintAll()

{

Student stu;

FILE *fp=fopen(path,"ab+");

int n,cnt=0;

while((n=fread(&stu,sizeof(stu),1,fp)>0))

{

if(cnt==0)

PrintTitle();

Print(stu);

cnt++;

}

fclose(fp);

if(cnt==0)

puts("无数据");

else

printf("共%d条\\n",cnt);

}

//---------------------------------------------------------Input()

Student Input()

{

Student stu;

puts("请输入姓名、班级、学号、系院:");

scanf("%s%s%s%s",&stu.Name,&stu.ClassNo,&stu.No,&stu.Dept);

puts("请输入各科成绩：语文、数学、英语");

scanf("%lf%lf%lf",&stu.Chinese,&stu.Math,&stu.English);

stu.Ave=(stu.Chinese+stu.Math+stu.English)/3;

if(stu.Chinese>=60&&stu.Math>=60&&stu.English>=60)

stu.Pass=1;

else

stu.Pass=0;

return stu;

}

//---------------------------------------------------------Insert()

void Insert()

{

int cmd;

do{

Student stu=Input();

FILE *fp=fopen(path,"ab+");

fwrite(&stu,sizeof(stu),1,fp);

fclose(fp);

puts("录入成功");

puts("继续录入吗？[1]是[0]否");

scanf("%d",&cmd);

}while(cmd==1);

}

//---------------------------------------------------------Del()

void Del()

{

int cmd,cmd2;

char No[20];

do{

puts("请输入要删除的学号：");

scanf("%s",&No);

Student stu;

FILE *fp=fopen(path,"ab+");

FILE *fp2=fopen(tmp,"wb");

int n,find=0;

while((n=fread(&stu,sizeof(stu),1,fp))>0)

{

if(!strcmp(stu.No,No))

{

find=1;

Print(stu);

puts("确定要删除吗？[1]确定[0]取消");

scanf("%d",&cmd2);

if(cmd2==1)

puts("已删除");

else

fwrite(&stu,sizeof(stu),1,fp2);

}

else

fwrite(&stu,sizeof(stu),1,fp2);

}

fclose(fp);

fclose(fp2);

if(find==0)

{

printf("未找到学号%s\\n",No);

remove(tmp);

}

else

{

remove(path);

rename(tmp,path);

}

puts("继续删除吗？[1]是[0]否");

scanf("%d",&cmd);

}while(cmd==1);

}

//---------------------------------------------------------Change()

void Change()

{

int cmd;

char No[20];

do{

puts("请输入要更改的学号：");

scanf("%s",&No);

Student stu;

int find=0;

FILE *fp=fopen(path,"ab+");

FILE *fp2=fopen(tmp,"wb");

int n;

while((n=fread(&stu,sizeof(stu),1,fp))>0)

{

if(!strcmp(stu.No,No))

{

find=1;

stu=Input();

fwrite(&stu,sizeof(stu),1,fp2);

}

else

fwrite(&stu,sizeof(stu),1,fp2);

}

fclose(fp);

fclose(fp2);

if(find)

{

remove(path);

rename(tmp,path);

puts("更改成功！");

}

else

{

printf("未找到学号%s\\n",No);

remove(tmp);

}

puts("继续更改吗？[1]是[0]否");

scanf("%d",&cmd);

}while(cmd==1);

}

//---------------------------------------------------------AboutCourse

void Chinese()

{

double sum=0,ave;

int pass=0,fail=0,better=0;

Student stu;

FILE *fp=fopen(path,"ab+");

int n,cnt=Sort(1);

while((n=fread(&stu,sizeof(stu),1,fp))>0)

{

sum+=stu.Chinese;

if(stu.Chinese>=60)

{

pass++;

if(stu.Chinese>=80)

better++;

}

else

fail++;

}

ave=sum/cnt;

puts("语文成绩分析……");

printf("共有%d学生\\n优秀：%d人\\n及格：%d人\\n不及格：%d人\\n及格率：%.2lf%%\\n",cnt,better,pass,fail,100.0*pass/cnt);

printf("%-8s%-10s%-12s%-s\\n","名次","姓名","学号","语文");

for(int i=0;i<cnt;i++)

{

printf("第%2d名 %-10s%-12s%-8.2lf\\n",i+1,students[i].Name,students[i].No,students[i].Chinese);

}

printf("平均分：%.2lf\\n",ave);

}

void Math()

{

double sum=0,ave;

int pass=0,fail=0,better=0;

Student stu;

FILE *fp=fopen(path,"ab+");

int n,cnt=Sort(2);

while((n=fread(&stu,sizeof(stu),1,fp))>0)

{

sum+=stu.Math;

if(stu.Math>=60)

{

pass++;

if(stu.Math>=80)

better++;

}

else

fail++;

}

ave=sum/cnt;

puts("数学成绩分析……");

printf("共有%d学生\\n优秀：%d人\\n及格：%d人\\n不及格：%d人\\n及格率：%.2lf%%\\n",cnt,better,pass,fail,100.0*pass/cnt);

printf("%-8s%-10s%-12s%-s\\n","名次","姓名","学号","数学");

for(int i=0;i<cnt;i++)

{

printf("第%2d名 %-10s%-12s%-8.2lf\\n",i+1,students[i].Name,students[i].No,students[i].Math);

}

printf("平均分：%.2lf\\n",ave);

}

void English()

{

double sum=0,ave;

int pass=0,fail=0,better=0;

Student stu;

FILE *fp=fopen(path,"ab+");

int n,cnt=Sort(3);

while((n=fread(&stu,sizeof(stu),1,fp))>0)

{

sum+=stu.English;

if(stu.English>=60)

{

pass++;

if(stu.English>=80)

better++;

}

else

fail++;

}

ave=sum/cnt;

puts("英语成绩分析……");

printf("共有%d学生\\n优秀：%d人\\n及格：%d人\\n不及格：%d人\\n及格率：%.2lf%%\\n",cnt,better,pass,fail,100.0*pass/cnt);

printf("%-8s%-10s%-12s%-s\\n","名次","姓名","学号","英语");

for(int i=0;i<cnt;i++)

{

printf("第%2d名 %-10s%-12s%-8.2lf\\n",i+1,students[i].Name,students[i].No,students[i].English);

}

printf("平均分：%.2lf\\n",ave);

}

void Average()

{

Student stu;

int n,cnt=Sort(4);

double sum=0;

FILE *fp=fopen(path,"ab+");

while((n=fread(&stu,sizeof(stu),1,fp))>0)

{

sum+=stu.Chinese;

sum+=stu.Math;

sum+=stu.English;

}

puts("平均成绩分析……");

printf("%-8s%-10s%-12s%-s\\n","名次","姓名","学号","平均成绩");

for(int i=0;i<cnt;i++)

{

printf("第%2d名 %-10s%-12s%-8.2lf\\n",i+1,students[i].Name,students[i].No,students[i].Ave);

}

printf("平均分：%.2lf\\n",sum/cnt/3);

}

//---------------------------------------------------------Search()

void Search()

{

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持快网idc。

C语言版学生成绩管理系统

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