C语言程序设计学生成绩管理系统

#include "stdioh"

/定义学生结构体/

struct Student

{

char ID[20];

char Name[20];

float Mark1;

float Mark2;

float Mark3;

float Average;

};

/声明学生数组及学生数量/

struct Student students[1000];

int num=0;

/求平均值/

float Avg(struct Student stu)

{

return (stuMark1+stuMark2+stuMark3)/3;

}

/通过学号返回数组下标/

int Student_SearchByIndex(char id[])

{

int i;

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

{

if (strcmp(students[i]ID,id)==0)

{

return i;

}

}

return -1;

}

/通过姓名返回数组下标/

int Student_SearchByName(char name[])

{

int i;

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

{

if (strcmp(students[i]Name,name)==0)

{

return i;

}

}

return -1;

}

/显示单条学生记录/

void Student_DisplaySingle(int index)

{

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

printf("-------------------------------------------------------------\n");

printf("%10s%10s%82f%82f%82f%102f\n",students[index]ID,students[index]Name,

students[index]Mark1,students[index]Mark2,students[index]Mark3,students[index]Average);

}

/插入学生信息/

void Student_Insert()

{

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();

students[num]Average=Avg(students[num]);

num++;

printf("是否继续(y/n)");

if (getchar()=='n')

{

break;

}

}

}

/修改学生信息/

void Student_Modify()

{

float mark1,mark2,mark3;

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);

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--\n");

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("请输入成绩:");

scanf("%f",&students[index]Mark1);

getchar();

printf("请输入成绩:");

scanf("%f",&students[index]Mark2);

getchar();

printf("请输入成绩:");

scanf("%f",&students[index]Mark3);

getchar();

students[index]Average=Avg(students[index]);

}

printf("是否继续(y/n)");

if (getchar()=='n')

{

break;

}

}

}

/删除学生信息/

void Student_Delete()

{

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);

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)");

if (getchar()=='n')

{

break;

}

}

}

/按姓名查询/

void Student_Select()

{

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);

if (index==-1)

{

printf("学生不存在!\n");

}

else

{

printf("你要查询的学生信息为:\n");

Student_DisplaySingle(index);

}

printf("是否继续(y/n)");

if (getchar()=='n')

{

break;

}

}

}

/按平均值排序/

void Student_SortByAverage()

{

int i,j;

struct Student tmp;

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

{

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

{

if (students[j-1]Average<students[j]Average)

{

tmp=students[j-1];

students[j-1]=students[j];

students[j]=tmp;

}

}

}

}

/显示学生信息/

void Student_Display()

{

int i;

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

printf("-------------------------------------------------------------\n");

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

{

printf("%10s%10s%82f%82f%82f%102f\n",students[i]ID,students[i]Name,

students[i]Mark1,students[i]Mark2,students[i]Mark3,students[i]Average);

}

}

/将学生信息从文件读出/

void IO_ReadInfo()

{

FILE fp;

int i;

if ((fp=fopen("Databasetxt","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(struct Student),1,fp);

}

}

fclose(fp);

}

/将学生信息写入文件/

void IO_WriteInfo()

{

FILE fp;

int i;

if ((fp=fopen("Databasetxt","wb"))==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(struct Student),1,fp)!=1)

{

printf("写入文件错误!\n");

}

}

fclose(fp);

}

/主程序/

main()

{

int choice;

IO_ReadInfo();

while(1)

{

/主菜单/

printf("\n------ 学生成绩管理系统------\n");

printf("1 增加学生记录\n");

printf("2 修改学生记录\n");

printf("3 删除学生记录\n");

printf("4 按姓名查询学生记录\n");

printf("5 按平均成绩排序\n");

printf("6 退出\n");

printf("请选择(1-6):");

scanf("%d",&choice);

getchar();

switch(choice)

{

case 1:

Student_Insert();

break;

case 2:

Student_Modify();

break;

case 3:

Student_Delete();

break;

case 4:

Student_Select();

break;

case 5:

Student_SortByAverage();

Student_Display();

break;

case 6:

exit();

break;

}

IO_WriteInfo();

}

}

final String url = "jdbc:oracle:thin:@localhost:1521:ORCL";

final String user = "store";

final String password = "store_password";

ClassforName("oraclejdbcdriverOracleDriver");

Connection con = DriverManagergetConnection(url, user, password);

return con;

}

这是我以前写的库存管理，和你的要求差不多，你看一下吧，希望对你有帮助#include <iostream>

#include <cstring>

using namespace std;struct inv

{

char item[40];

double cost;

double retail;

int on_hand;

int lead_time;

inv next;

};//建立商品信息库

inv creat()

{

inv head, tail, pro;

head = tail = NULL;

cout << "Please initialize first:" << endl;

while (1)

{

pro = new inv;

pro -> next = NULL;

cout << "Item: ";

cin >> pro -> item; //如果输入商品名字为0，结束

if (pro -> item[0] == '0')

{

delete pro;

break;

} cout << "Cost: ";

cin >> pro -> cost;

cout << "Retail: ";

cin >> pro -> retail;

cout << "on_hand: ";

cin >> pro -> on_hand;

cout << "Lead_time: ";

cin >> pro -> lead_time; //如果链表为空，加入第一个结点

if (tail == NULL)

head = tail = pro;

else

{

//如果链表中已经有其他点，将新结点加入链表结尾

tail -> next = pro;

tail = pro;

}

}

cout << endl;

return head;

}//选择菜单

char manu()

{

char str;

do

{

cout << "e: enter new information" << endl;

cout << "d: display all of them" << endl;

cout << "r: delete one of them" << endl;

cout << "u: update one of them" << endl;

cout << "v: view one of them" << endl;

cout << "q: quit" << endl << endl;

cout << "choose one: ";

cin >> str;

}

while (!strchr("edruvq", tolower(str)));

return str;

}//输出所有库存信息

void display(inv pro)

{

//如果链表为空，输出提示语句

if (pro == NULL)

{

cout << "Link is NULL!" << endl << endl;

return;

} inv p;

p = pro; //如果链表不为空，输出库存信息

while (p != NULL)

{

cout << "Items: " << p -> item << endl;

cout << "Cost: " << p -> cost << endl;

cout << "Retail price: " << p -> retail << endl;

cout << "On hand: " << p -> on_hand << endl;

cout << "Lead time to resupply: " << p -> lead_time << endl;

cout << endl;

p = p -> next;

}

}//输入新产品信息

inv enter(inv pro)

{

inv tail, p;

tail = pro; //如果链表不为空，找到链表结尾

if (tail != NULL) //必须加这一步判断，否则链表为空时，输入产品信息会出错

{

while (tail -> next != NULL)

tail = tail -> next;

}

//申请结点，存入新产品信息

p = new inv;

p -> next = NULL;

cout << "Item: ";

cin >> p -> item;

cout << "Cost: ";

cin >> p -> cost;

cout << "Retail: ";

cin >> p -> retail;

cout << "on_hand: ";

cin >> p -> on_hand;

cout << "Lead_time: ";

cin >> p -> lead_time; //如果链表为空，加入第一个结点 必须加这一步，否则链表为空时，输入产品信息会出错

if(tail == NULL)

tail = p;

//如果链表不为空，将新结点加到链表尾部

else

tail -> next = p; cout << endl;

return pro;

}//删除某个产品信息

inv remove(inv pro)

{

//如果链表为空，输出提示信息

if (pro == NULL)

{

cout << "Link is NULL" << endl << endl;

return pro;

} inv p, q;

p = pro;

q = pro -> next;

char name[40];

cout << "Please input the item you want to remove: ";

cin >> name;

cout << endl;

//如果头结点为要删除的点，删除之

if (!strcmp(name, pro -> item))

{

p = pro;

pro = pro -> next;

delete p;

return pro;

}

//找到要删除结点

while (q != NULL)

{

if (strcmp(name, q -> item))

{

p = q;

q = q -> next;

}

} if (q != NULL)

{

p -> next = q -> next;

delete q;

}

//如果未找到要删除的产品，输出提示信息

else

cout << "Item is not found!" << endl; cout << endl;

return pro;

}//更新某个产品信息

inv update(inv pro)

{

//如果链表为空，输出提示信息

if (pro == NULL)

{

cout << "Link is NLL!" << endl << endl;

return pro;

} inv p;

p = pro;

char name[40];

cout << "Please input the item you want to update: ";

cin >> name;

cout << endl; //找到要更新的产品

while (p != NULL)

p = p -> next; //如果未找到该产品，输出提示信息

if (p == NULL)

{

cout << "Item is not found!" << endl << endl;

return pro;

}

//更新产品信息

cout << "Cost: ";

cin >> p -> cost;

cout << "Retail: ";

cin >> p -> retail;

cout << "on_hand: ";

cin >> p -> on_hand;

cout << "Lead_time: ";

cin >> p -> lead_time; cout << endl;

return pro;

}//查看某种产品信息

void view(inv pro)

{

//如果链表为空，输出提示信息

if (pro == NULL)

{

cout << "Link is NULL!" << endl << endl;

return;

}

char name[40];

cout << "Please input the item you want to view: ";

cin >> name;

cout << endl; inv p;

p = pro; //找到要查看的产品

while (p != NULL)

p = p -> next; //如果未找到该产品，输出提示信息

if (p == NULL)

{

cout << "Item is not found!" << endl << endl;

return;

}

//输出该产品信息

cout << "Items: " << p -> item << endl;

cout << "Cost: " << p -> cost << endl;

cout << "Retail price: " << p -> retail << endl;

cout << "On hand: " << p -> on_hand << endl;

cout << "Lead time to resupply: " << p -> lead_time << endl;

cout << endl;

}int main()

{

inv product;

product = new inv;

product = NULL; //链表初始化

product = creat();

char choice;

while (1)

{

//读入要进行的 *** 作

choice = manu();

switch (choice)

{

case 'e':

product = enter(product);

break;

case 'd':

display(product);

break;

case 'r':

product = remove(product);

break;

case 'u':

product = update(product);

break;

case 'v':

view(product);

break;

case 'q':

return 0;

}

}

return 0;

}

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