xueshengxinxiguanli.txt

学生信息管理系统,包含信息维护,信息查询,成绩统计,排序

#include<iostream.h> 
#include<string.h> 
#include<fstream.h> 
class stu 
{ 
char name[20]; 
double math,chinese,english,average,sum; 
public: 
stu() 
{ 
} 
stu(char n[20],double ma,double chin,double eng) 
{ 
strcpy(name,n); 
math=ma; 
chinese=chin; 
english=eng; 
} 
double getsum() 
{ 
sum=chinese+english+math; 
return sum; 
} 
double getaver() 
{ 
average=getsum()/3; 
return average; 
} 
friend void main(); 
}; 


void main() 
{ 
cout<<"请选择您需要的操作！"<<endl; 
cout<<"操作："<<endl; 
cout<<"(0)数据录入"<<endl; 
cout<<"(1)增加人员"<<endl; 
cout<<"(2)删除人员"<<endl; 
cout<<"(3)修改数据"<<endl; 
cout<<"查询："<<endl; 
cout<<"(4)按总成绩查询"<<endl; 
cout<<"(5)按姓名查询"<<endl; 
cout<<"(6)输出所有学生的数据"<<endl; 
cout<<"成绩名词"<<endl; 
cout<<"(7)按总分查询排名"<<endl; 
cout<<"(8)按语文查询排名"<<endl; 
cout<<"(9)按数学查询排名"<<endl; 
cout<<"(y)按英语查询排名"<<endl; 
cout<<"选择相关操作请输入相对的括号里的阿拉伯数字！"<<endl; 
char p;char w; 
stu *s[50]; 
ofstream *file[50]; 
int i=0; 
int j=0; 
bool flag2=0; 
do 
{ 
cin>>p; 
if((p>='0'&&p<='10')) 
flag2=1; 
else 
cout<<"指令错误！请重新输入："<<endl; 
}while(flag2==0); 
do{ 
switch(p) 
{ 
case '0': 
{ 
char c; 
char name[20];double math,chinese,english; 
do{ 
cout<<"请输入姓名"<<endl; 
cin>>name; 
cout<<"请输入数学成绩："<<endl; 
cin>>math; 
cout<<"请输入语文成绩："<<endl; 
cin>>chinese; 
cout<<"请输入外语成绩："<<endl; 
cin>>english; 
file[j]=new ofstream("d:\\document",ios::ate); 
*file[j]<<"姓名"<<name<<"数学成绩"<<math<<"语文成绩"<<chinese<<"外语成绩"<<english<<endl; 
j++; 
s[i]=new stu(name, math, chinese, english); 
i++; 
cout<<"数据录入成功，想继续录入吗(y/n)"<<endl; 
cin>>c; 
flag2=0; 
do 
{ 
if(c!='y'&&c!='n') 
{ 
cout<<"指令错误！请重新输入！"<<endl; 
cin>>c; 
} 
else 
flag2=1; 
}while(flag2==0); 
}while(c=='y'); 
break; 
} 
case '4': 
{ 
double t;char c; 
do 
{ 
int flag1=0; 
cout<<"请输入你要查询学生的总成绩"<<endl; 
cin>>t; 
for(int q=0;q<i;q++) 
{ 
if(s[q]->getsum()==t) 
{ 
flag1=1; 
cout<<"您要查询的学生是："<<(*s[q]).name<<endl; 
} 
} 
if(flag1==0) 
cout<<"对不起！您要查询的学生不存在！"<<endl; 
cout<<"您想继续查询吗?(y/n)"<<endl; 
cin>>c; 
if(c!='y'&&c!='n') 
{ 
cout<<"指令错误！请重新输入！"<<endl; 
cin>>c; 
} 
} 
while(c=='y'); 
break; 
} 

case '5': 
{ 
char n[20];int j=0;char c; 
do{ 
int flag=0; 
cout<<"请输入你要查询的学生姓名"<<endl; 
cin>>n; 
for(int j=0;j<i;j++) 
{ 
if(strcmp(n,(*s[j]).name)==0) 
{ 
flag=1; 
cout<<"您要查询的学生是："<<(*s[j]).name<<endl; 
cout<<(*s[j]).name<<"的总成绩成绩是"<<(*s[j]).getsum()<<endl<<"平均成绩是："<<(*s[j]).getaver()<<endl; 
} 
} 
if(flag==0) 
cout<<"对不起!您要查询的学生不存在!"<<endl; 
cout<<"您想继续查询吗?(y/n)"<<endl; 
cin>>c; 
if(c!='y'&&c!='n') 
{ 
cout<<"指令错误！请重新输入！"<<endl; 
cin>>c; 
} 
} 
while(c=='y'); 
break; 
} 
case '1': 
{ 
char name[20];double math,chinese,english; 
char c; 
do 
{ 
cout<<"请输入您要增加的学生的姓名："<<endl; 
cin>>name; 
cout<<"请输入数学成绩："<<endl; 
cin>>math; 
cout<<"请输入语文成绩："<<endl; 
cin>>chinese; 
cout<<"请输入外语成绩："<<endl; 
cin>>english; 
file[j]=new ofstream("d:\\document",ios::ate); 
*file[j]<<"姓名"<<name<<"数学成绩"<<math<<"语文成绩"<<chinese<<"外语成绩"<<english<<endl; 
j++; 
s[i]=new stu(name, math, chinese, english); 
i++; 
cout<<"数据录入成功，想继续录入吗(y/n)"<<endl; 
cin>>c; 
if(c!='y'&&c!='n') 
{ 
cout<<"指令错误！请重新输入！"<<endl; 
cin>>c; 
} 
}while(c=='y'); 
break; 
} 
case '2': 
{ 
char name[20];bool flag3=0;char c; 
do{ 
cout<<"请输入您要删除的学生姓名："<<endl; 
cin>>name; 
for(int h=0;h<i;h++) 
{ 
if(strcmp(name,s[h]->name)==0) 
{ 
flag3=1; 
i--; 
do{ 
s[h]=s[h+1]; 
h++; 
}while(h<=i); 
} 
} 
if(flag3==0) 
cout<<"您要求删除的对象本来就不存在！请检查输入的正确性！"; 
cout<<"要继续删除吗？(y/n)"<<endl; 
cin>>c; 
if(c!='y'&&c!='n') 
{ 
cout<<"指令错误！请重新输入！"<<endl; 
cin>>c; 
} 
}while(c=='y'); 
break; 
} 
case '3': 
{ 
char name[20];double mat,chin,eng;flag2=0; 
char c; 
do 
{ 
cout<<"请输入您要修改的学生的姓名："<<endl; 
cin>>name; 
for(int h=0;h<i;h++) 
{ 
if(strcmp(name,s[h]->name)==0) 
{ 
flag2=1; 
cout<<"请输入新的数学成绩："<<endl; 
cin>>mat; 
cout<<"请输入新的语文成绩："<<endl; 
cin>>chin; 
cout<<"请输入新的外语成绩："<<endl; 
cin>>eng; 
s[h]->chinese=chin; 
s[h]->math=mat; 
s[h]->english=eng; 
cout<<"数据修改成功！"; 
} 
} 
if(flag2==0) 
{ 
cout<<"您要修改的学生本来就不存在！请检查重新输入！"<<endl; 
} 
cout<<"想继续修改吗(y/n)"<<endl; 
cin>>c; 
if(c!='y'&&c!='n') 
{ 
cout<<"指令错误！请重新输入！"<<endl; 
cin>>c; 
} 
}while(c=='y'); 
break; 
} 

case '6': 
{ 
cout<<"本系统所有学生数据如下："<<endl; 
if(i==0) 
cout<<"管理系统中没有录入数据或者数据已经被删除！"<<endl; 
for(int k=0;k<i;k++) 
{ 
cout<<k+1<<" "<<"姓名:"<<" "<<s[k]->name<< 
"语文："<<" "<<s[k]->chinese<<"数学："<<" "<<s[k]->math 
<<"外语："<<" "<<s[k]->english<<"总分："<<" "<<(*s[k]).getsum() 
<<"平均分："<<" "<<(*s[k]).getaver()<<endl; 
} 
break; 
} 
case '7': 
{ 
int t;stu b; 

cout<<"本系统所以学生排名如下："<<endl; 
for(int x=0;x<i-1;x++) 
{ 
t=x; 
for(int y=x+1;y<i;y++) 
{ 
if((s[t]->getsum())<(s[y]->getsum())) 
t=y; 
if(t!=x) 
{ 
b=*s[x]; 
*s[x]=*s[t]; 
*s[t]=b; 
} 
} 
} 
if(i==0) 
cout<<"管理系统中没有录入数据或者数据已经被删除！"; 
for(int k=0;k<i;k++) 
{ 
cout<<k+1<<" "<<"姓名:"<<" "<<s[k]->name<< 
"语文："<<" "<<s[k]->chinese<<"数学："<<" "<<s[k]->math 
<<"外语："<<" "<<s[k]->english<<"总分："<<" "<<s[k]->getsum() 
<<"平均分："<<" "<<s[k]->getaver()<<endl; 
} 
break; 
} 
case '8': 
{ 
int t;stu b; 

cout<<"本系统所以学生语文排名如下："<<endl; 
for(int x=0;x<i-1;x++) 
{ 
t=x; 
for(int y=x+1;y<i;y++) 
{ 
if((s[t]->chinese)<(s[y]->chinese)) 
t=y; 
if(t!=x) 
{ 
b=*s[t]; 
*s[t]=*s[x]; 
*s[x]=b; 
} 
} 
} 

if(i==0) 
cout<<"管理系统中没有录入数据或者数据已经被删除！"; 
for(int k=0;k<i;k++) 
{ 
cout<<k+1<<" "<<"姓名:"<<" "<<s[k]->name<< 
"语文："<<" "<<s[k]->chinese<<"数学："<<" "<<s[k]->math 
<<"外语："<<" "<<s[k]->english<<"总分："<<" "<<s[k]->getsum() 
<<"平均分："<<" "<<s[k]->getaver()<<endl; 
} 
break; 
} 
case '9': 
{ 
int t;stu b; 

cout<<"本系统所以学生数学排名如下："<<endl; 
for(int x=0;x<i-1;x++) 
{ 
t=x; 
for(int y=x+1;y<i;y++) 
{ 
if((s[t]->math)<(s[y]->math)) 
t=y; 
if(t!=x) 
{ 
b=*s[t]; 
*s[t]=*s[x]; 
*s[x]=b; 
} 
} 
} 

if(i==0) 
cout<<"管理系统中没有录入数据或者数据已经被删除！"; 
for(int k=0;k<i;k++) 
{ 
cout<<k+1<<" "<<"姓名:"<<" "<<s[k]->name<< 
"语文："<<" "<<s[k]->chinese<<"数学："<<" "<<s[k]->math 
<<"外语："<<" "<<s[k]->english<<"总分："<<" "<<s[k]->getsum() 
<<"平均分："<<" "<<s[k]->getaver()<<endl; 
} 
break; 
} 
case 'y': 
{ 
int t;stu b; 

cout<<"本系统所以学生英语排名如下："<<endl; 
for(int x=0;x<i-1;x++) 
{ 
t=x; 
for(int y=x+1;y<i;y++) 
{ 
if((s[t]->english)<(s[y]->english)) 
t=y; 
if(t!=x) 
{ 
b=*s[t]; 
*s[t]=*s[x]; 
*s[x]=b; 
} 
} 
} 

if(i==0) 
cout<<"管理系统中没有录入数据或者数据已经被删除！"; 
for(int k=0;k<i;k++) 
{ 
cout<<k+1<<" "<<"姓名:"<<" "<<s[k]->name<< 
"语文："<<" "<<s[k]->chinese<<"数学："<<" "<<s[k]->math 
<<"外语："<<" "<<s[k]->english<<"总分："<<" "<<s[k]->getsum() 
<<"平均分："<<" "<<s[k]->getaver()<<endl; 
} 
} 
break; 
} 

cout<<"您想继续进行其他操作吗?(y/n)"<<endl; 
bool flag4=0; 
do 
{ 
cin>>w; 
if(w!='y'&&w!='n') 
cout<<"指令错误！请重新输入！"<<endl; 
else 
flag4=1; 
}while(flag4==0); 
if(w=='y') 
cout<<"请输入操作代码(0 录入/4 按总分查询/5 按姓名查询/1 增加人员/2 删除人员/3 修改数据/6 显示所有成员数据/7 按总分排名/8 按语文排名/9按数学排名/y按英语排名)"<<endl; 
cin>>p; 
}while(w=='y'); 
for(int x=0;x<i;x++) 
{ 
delete s[x]; 
cout<<"delete all members!"<<endl; 
} 

}