当前位置：网站首页>学生成绩管理系统（C语言）
学生成绩管理系统（C语言）
2022-07-30 05:50:00 【m0_67402970】
学生成绩管理系统
思路
学生成绩管理系统，首先要初始化系统，开始一个新的学生成绩系统初始化记录学生姓名，学号，院系，然后输入学生各科成绩，数学，英语，语文成绩。记录完各课成绩以后，可查看学生平均成绩和是否及格，成绩查询其中有学号查询，姓名查询，院系查询，还有全部输出，可以清晰的看到及格人数，按照分数高低排列，最后还可以添加和删除学生成绩，或者更改学生成绩，避免人为录入成绩错误。
基本函数
1.结构体 struct Student
定义一个结构体struct，结构体的关键字，students定义的结构体对象。学号char ID[20];姓名char Name[10]; 各项成绩float Mark，总成绩 float All 平均成绩 float Average;
2.录入（void inputt（））
利用循环将数据从students[0]开始录入各项信息，计数器num+1。
2.删除（void deletee（））
利用循环将数组里面的信息与待删除的信息比对，若相同，将此项删除并将后面的信息向前移动一位，计数器num-1；若无此项，提示重新输入。
3.修改（void modfiy（））
利用循环将数组里面的信息与待修改的信息比对，若相同，对其进行重新复制即修改；若无此项，提示重新输入。
4.插入（void insert（）)
提示输入插入的位置，将该位置后及该位置的信息向后挪一位，将新信息录入该位置。计数器num+1。
5.排序 （void sort（））
走排序的平均分，依次比较两个相邻的成绩，如果他们的顺序如果前小于后就把他们交换过来。走访元素的工作是重复地进行直到没有相邻元素需要交换，也就是说该元素已经排序完成。
6.显示 （void display（））
利用循环将已录入的信息打印出来。
7.查询 （void Student_SearchByIndex（））
提示要查询学生的学号，利用循环比对，若相同，将此项信息打印出来；若无此项，提示重新输入。
8.主函数 main（）
利用无限次循环while和swithch（)实现各函数的调用，系统根据输入的数字来操控相应的函数，同时显示可供选择的选项。
#include<stdio.h>
#include<stdlib.h>
#include<stdlib.h>
#include<string.h>
struct Student{ //每个学生对应一个结构体
char ID[20];//学号
char Name[10];//姓名
float Mark1;//语文成绩
float Mark2;//数学成绩
float Mark3;//英语成绩
float Mark4;//计算机成绩
float All; //总分
float Average;//平均成绩
}students[1000];
int num=0; //计数器
void Copy(struct Student *arr,int i,int j)
{
strcpy(arr[i].ID,arr[j].ID);
strcpy(arr[i].Name,arr[j].Name);
arr[i].Mark1 = arr[j].Mark1;
arr[i].Mark2 = arr[j].Mark2;
arr[i].Mark3 = arr[j].Mark3;
arr[i].Mark4 = arr[j].Mark4;
arr[i].All = arr[j].All;
arr[i].Average = arr[j].Average;
}
int Student_SearchByName(char name[])//通过姓名来检索学生
{
int i;
for (i=0;i<num;i++)
{
if (strcmp(students[i].Name,name)==0) //通过strcmp函数来对比学生姓名，找到返回在数组的位置
{
return i;
}
}
return -1; //未找到返回 -1
}
int Student_SearchByIndex(char id[])//通过学号来检索学生信息
{
int i;
for (i=0;i<num;i++)
{
if (strcmp(students[i].ID,id)==0) //通过strcmp函数来对比学生id，找到返回位置
{
return i;
}
}
return -1; //未找到返回 -1
}
void Student_DisplaySingle(int index)//输出表头
{
printf("%10s%10s%8s%8s%8s%10s
","学号","姓名","语文","数学","英语","计算机","总成绩","平均成绩");
printf("-------------------------------------------------------------
");
printf("%10s%10s%8.2f%8.2f%8.2f%8.2f%10.2f%10.2f
",students[index].ID,students[index].Name,
students[index].Mark1,students[index].Mark2,students[index].Mark3,students[index].Mark4,students[index].All,students[index].Average);
}
void inputt()//利用循环录入学生信息
{
while(1)
{
printf("请输入学号:");
scanf("%s",&students[num].ID);
getchar();
printf("请输入姓名:");
scanf("%s",&students[num].Name);
getchar();
printf("请输入成绩:");
scanf("%f",&students[num].Mark1);
getchar();
printf("请输入成绩:");
scanf("%f",&students[num].Mark2);
getchar();
printf("请输入成绩:");
scanf("%f",&students[num].Mark3);
getchar();
printf("请输入成绩:");
scanf("%f",&students[num].Mark4); //依次输入各项数据
getchar();
students[num].All=students[num].Mark1+students[num].Mark2+students[num].Mark3+students[num].Mark4; //输完数据后自动计算总成绩与平均成绩
students[num].Average=(students[num].Mark1+students[num].Mark2+students[num].Mark3+students[num].Mark4)/4;
if(Student_SearchByIndex(students[num].ID) == -1)
{
num++; //移向下一个位置
}
else
{
printf("学号重复，输入数据无效 !!!
");
}
printf("是否继续?(y/n)");
if (getchar()=='n')
{
break;
}
}
}
void modify()//修改成绩
{
while(1)
{
char id[20];
int index;
printf("请输入要修改的学生的学号:");
scanf("%s",&id);
getchar();
index=Student_SearchByIndex(id); //调用搜查id函数，根据其返回值确定位置
if (index==-1)
{
printf("学生不存在!
");
}
else
{
printf("你要修改的学生信息为:
");
Student_DisplaySingle(index);
printf("-- 请输入新值--
");
printf("请输入学号:");
scanf("%s",&students[index].ID);
getchar();
printf("请输入姓名:");
scanf("%s",&students[index].Name);
getchar();
printf("请输入语文成绩:");
scanf("%f",&students[index].Mark1);
getchar();
printf("请输入数学成绩:");
scanf("%f",&students[index].Mark2);
getchar();
printf("请输入英语成绩:");
scanf("%f",&students[index].Mark3);
getchar();
printf("请输入计算机成绩:");
scanf("%f",&students[index].Mark4); //重新录入一套新的数据替代
getchar();
students[index].All=students[index].Mark1+students[index].Mark2+students[index].Mark3+students[index].Mark4;
students[index].Average=(students[index].Mark1+students[index].Mark2+students[index].Mark3+students[index].Mark4)/4;
}
printf("是否继续?(y/n)");
if (getchar()=='n')
{
break;
}
}
}
void deletee()//删除学生信息
{
int i;
while(1)
{
char id[20];
int index;
printf("请输入要删除的学生的学号:");
scanf("%s",&id);
getchar();
index=Student_SearchByIndex(id); //调用搜查id函数，根据其返回值确定位置
if (index==-1)
{
printf("学生不存在!
");
}
else
{
printf("你要删除的学生信息为:
");
Student_DisplaySingle(index);
printf("是否真的要删除?(y/n)");
if (getchar()=='y')
{
for (i=index;i<num-1;i++)
{
Copy(students,i,i+1);
//students[i]=students[i+1]; //把后边的对象都向前移动
}
num--;
}
getchar();
}
printf("是否继续?(y/n)");
if (getchar()=='n')
{
break;
}
}
}
void display()//打印已录入的学生信息
{
int a;
printf("%10s%10s%8s%8s%8s%8s%10s%10s
","学号","姓名","语文","数学","英语","计算机","总成绩","平均成绩");
printf("-------------------------------------------------------------
");
for (a=0;a<num;a++)
{
printf("%10s%10s%8.2f%8.2f%8.2f%8.2f%10.2f%10.2f
",students[a].ID,students[a].Name,
students[a].Mark1,students[a].Mark2,students[a].Mark3,students[a].Mark4,students[a].All,students[a].Average);
}
}
void insert()//指定位置插入学生信息
{
int a,b,c;
printf("请输入你要插入的位置");
scanf("%d",&a);
if(a>num) {
printf("输入的位置有误，请重新输入,当前共%d条数据
",num);
scanf("%d",&a);}
b=num-1;
for(;b>=a-1;b--)
{
//strcpy(students[b+1].ID,students[b].ID);
//strcpy(students[b+1].Name,students[b].Name);
//students[b+1].Mark1=students[b].Mark1;
//students[b+1].Mark2=students[b].Mark2;
//students[b+1].Mark3=students[b].Mark3;
//students[b+1].Mark4=students[b].Mark4;
//students[b+1].All=students[b].All;
//students[b+1].Average=students[b].Average;
Copy(students,b+1,b); //根据其输入的位置，将其及以后的数据向后移动一个位置
}
num++;
printf("请输入学号:");
scanf("%s",&students[a-1].ID);
getchar();
printf("请输入姓名:");
scanf("%s",&students[a-1].Name);
getchar();
printf("请输入语文成绩:");
scanf("%f",&students[a-1].Mark1);
getchar();
printf("请输入数学成绩:");
scanf("%f",&students[a-1].Mark2);
getchar();
printf("请输入英语成绩:");
scanf("%f",&students[a-1].Mark3);
getchar();
printf("请输入计算机成绩:");
scanf("%f",&students[a-1].Mark4); //输入新数据
getchar();
students[a-1].All=students[a-1].Mark1+students[a-1].Mark2+students[a-1].Mark3+students[a-1].Mark4;
students[a-1].Average=(students[a-1].Mark1+students[a-1].Mark2+students[a-1].Mark3+students[a-1].Mark4)/4;
}
void search()//查询学生信息
{
while(1)
{
char name[20];
int index;
printf("请输入要查询的学生的姓名:");
scanf("%s",&name);
getchar();
index=Student_SearchByName(name); //调用搜查name函数，根据其返回值确定位置
if (index==-1)
{
printf("学生不存在!
");
}
else
{
printf("你要查询的学生信息为:
");
Student_DisplaySingle(index);
}
printf("是否继续?(y/n)");
if (getchar()=='n')
{
break;
}
}
}
void sort()//根据平均分排序
{
int i,j;
//struct students tmp;
for (i=0;i<num;i++)
{
students[i].Average=(students[i].Mark1+students[i].Mark2+students[i].Mark3+students[i].Mark4)/4;
}
for (i=0;i<num;i++)
{
for (j=1;j<num-i;j++)
{
if (students[j-1].Average<students[j].Average)
{
Copy(students,num,j-1);
Copy(students,j-1,j);
Copy(students,j,num);
//tmp=students[j-1];
//students[j-1]=students[j];
//students[j]=tmp; //冒泡排序
}
}
}
int a;
printf("%10s%10s%8s%8s%8s%10s
","学号","姓名","语文","数学","英语","计算机","总成绩","平均成绩");
printf("-------------------------------------------------------------
");
for (a=0;a<num;a++)
{
printf("%10s%10s%8.2f%8.2f%8.2f%8.2f%10.2f%10.2f
",students[a].ID,students[a].Name,
students[a].Mark1,students[a].Mark2,students[a].Mark3,students[a].Mark4,students[a].All,students[a].Average);
}
}
void SearchLow()//搜索不及格的并输出
{
int a;
printf(" 语文不及格的有%10s%10s%8s
","学号","姓名","语文");
for(a=0;a<num;a++)
{
if(students[a].Mark1<60)
printf("%10s%10s%8.2f
",students[a].Name,students[a].ID,students[a].Mark1); //从头搜索到尾，若小于60就输出
}
printf(" 数学不及格的有%10s%10s%8s
","学号","姓名","数学");
for(a=0;a<num;a++)
{
if(students[a].Mark2<60)
printf("%10s%10s%8.2f
",students[a].Name,students[a].ID,students[a].Mark2);
}
printf(" 英语不及格的有%10s%10s%8s
","学号","姓名","英语");
for(a=0;a<num;a++)
{
if(students[a].Mark3<60)
printf("%10s%10s%8.2f
",students[a].Name,students[a].ID,students[a].Mark3);
}
printf(" 计算机不及格的有%10s%10s%8s
","学号","姓名","计算机");
for(a=0;a<num;a++)
{
if(students[a].Mark4<60)
printf("%10s%10s%8.2f
",students[a].Name,students[a].ID,students[a].Mark4);
}
system("pause");
}
void SearchHigh()//搜索成绩最高者输出
{
int a;
int max ;
printf(" 语文最高分为%10s%10s%8s
","学号","姓名","语文");
max=students[0].Mark1;
for(a=1;a<num;a++)
{
if(students[a].Mark1>max)
max=students[a].Mark1;
}
for(a=0;a<num;a++)
{
if(max==students[a].Mark1)
printf("%10s%10s%8.2f
",students[a].Name,students[a].ID,students[a].Mark1);
}
printf(" 数学最高分为%10s%10s%8s
","学号","姓名","数学");
max=students[0].Mark2;
for(a=1;a<num;a++)
{
if(students[a].Mark2>max)
max=students[a].Mark2;
}
for(a=0;a<num;a++)
{
if(max==students[a].Mark2)
printf("%10s%10s%8.2f
",students[a].Name,students[a].ID,students[a].Mark2);
}
printf(" 英语最高分为%10s%10s%8s
","学号","姓名","英语");
max=students[0].Mark3;
for(a=1;a<num;a++)
{
if(students[a].Mark3>max)
max=students[a].Mark3;
}
for(a=0;a<num;a++)
{
if(max==students[a].Mark3)
printf(" %10s%10s%8.2f
",students[a].Name,students[a].ID,students[a].Mark3);
}
printf(" 计算机最高分为%10s%10s%8s
","学号","姓名","计算机");
max=students[0].Mark4;
for(a=1;a<num;a++)
{
if(students[a].Mark4>max)
max=students[a].Mark4;
}
for(a=0;a<num;a++)
{
if(max==students[a].Mark4)
printf(" %10s%10s%8.2f
",students[a].Name,students[a].ID,students[a].Mark4);
}
system("pause");
}
void Save()
{
FILE*fp = fopen("temp.txt","w+");
fprintf(fp,"%d
",num);
for(int i = 0 ; i< num ;i++)
{
fprintf(fp,"%s %s %f %f %f %f %f %f
",students[i].ID,students[i].Name,students[i].Mark1,students[i].Mark2,students[i].Mark3,students[i].Mark4,students[i].All,students[i].Average);
}
fclose(fp);
}
void Load()
{
FILE*fp = fopen("temp.txt","r");
fscanf(fp,"%d",&num);
for(int i = 0 ; i< num ;i++)
{
fscanf(fp,"%s %s %f %f %f %f %f %f
",students[i].ID,students[i].Name,&students[i].Mark1,&students[i].Mark2,&students[i].Mark3,&students[i].Mark4,&students[i].All,&students[i].Average);
}
fclose(fp);
}
/*主程序*/
int main(){
int i;
while(1){
Load();
printf(" -------- 学生成绩管理系统-------
"); //菜单
printf(" 1. 增加学生记录
");
printf(" 2. 修改学生记录
");
printf(" 3. 删除学生记录
");
printf(" 4. 插入学生记录
");
printf(" 5. 显示所有记录
");
printf(" 6. 查询学生记录
");
printf(" 7. 按平均成绩排序
");
printf(" 8. 输出各科目不及格学生
");
printf(" 9. 输出各科目最高分
");
printf(" 0. 退出
");
printf("请选择(0-9):");
scanf("%d",&i);
switch(i){
case 1:inputt();break;
case 2:modify();break;
case 3:deletee();break;
case 4:insert();break;
case 5:display();break;
case 6:search();break;
case 7:sort();break;
case 8:SearchLow();break;
case 9:SearchHigh();break;
case 0:exit(0);
default: ;
}
Save();
}
return 0;
}
代码进行了以下修改
1.关于含有数组成员的结构体拷贝的问题
2.对学号的唯一，进行了限定(inputt函数)
3.增加了从文件读写
现存问题
1.输出格式
2.插入时（insert）没对学号进行唯一性判断
边栏推荐
- Polygon 3D（三维平面多边形）的法向量的计算（MeshLab默认的计算）
- No, the Log4j vulnerability hasn't been fully fixed yet?
- Test Development Engineer Growth Diary 017 - The Life Cycle of a Bug
- 云服务器零基础部署网站(保姆级教程)
- Rodrigues: vector representation of rotation matrices
- Boot process and service control
- 这个终端连接工具，碾压Xshell
- MongoDB - query
- What happens when @Bean and @Component are used on the same class?
- 如何理解普吕克坐标（几何理解）
猜你喜欢
2020 数学建模之旅
Linx common directory & file management commands & VI editor usage introduction
Required request body is missing problem solving
人工肌肉智能材料新突破
Redis下载与安装
Test and Development Engineer Growth Diary 009 - Environment Pai Pai Station: Development Environment, Test Environment, Production Environment, UAT Environment, Simulation Environment
C＃的访问修饰符,声明修饰符,关键字有哪些？扫盲篇
万能js时间日期格式转换
How to understand plucker coordinates (geometric understanding)
Playing script killing with AI: actually more involved than me
随机推荐
Process and Scheduled Task Management
Redis下载与安装
千万级数据量的表，怎样最快速度查询？
Redis 如何实现防止超卖和库存扣减操作？
Table with tens of millions of data, how to query the fastest?
debian 问题
Required request body is missing 问题解决
Test Development Engineer Growth Diary 001 - Some Introduction to Agile Testing, CI/CD/CT, DecOps
PXE高效批量网络装机
Rodrigues：旋转矩阵的向量表达
export , export default, import complete usage
向量的导数运算和向量叉乘以及点乘的导数运算
开发常用工具软件
预测人们对你的第一印象，“AI颜狗”的诞生
Swagger使用方式,告别postman
空间直线到平面上的交点的计算证明及其源码
Electron使用romote报错 : Uncaught TypeError: Cannot read property ‘BrowserWindow‘ of undefined
向量叉乘的几何意义及其模的计算
分布式系统中的开创者—莱斯利·兰伯特
From catching up to surpassing, domestic software shows its talents