马碧沛.cpp

vc学生成绩管理系统

#include<iostream.h>
#include<string.h>
#include<fstream.h>
class stu
{
	char name[20];
	double math,VC,english,average,sum;
public:
	stu(){}
	stu(char n[20],double V,double eng)
	{
		strcpy(name,n);
		math=ma;
		VC=V;
		english=eng;
	}
	double getsum()
	{
		sum=VC+english+math;
		return sum;
	}
	double getaver()
	{
		average=getsum()/3;
		return average;
	}
	friend void main();
}
void main()
{
	cout<<"学生成绩管理系统."<<endl;
	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)输出所有学生数据"<<endl;
	cout<<"成绩名词"<<endl;
	cout<<"(7)按总分查询排名"<<endl;
	cout<<"(8)按VC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<<"选择相操作请输入相对的括号里的数字!"<<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>='o'&&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 name[20];
				double math,VC,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VC成绩:"<<endl;
					cin>>VC;
					cout<<"请输入英语成绩:"<<endl;
					cin>>english;
					file[j]=new ofstream("f1",ios::ate);
					*file[j]<<"姓名"<<name<<"数学成绩"<<math<<"VC成绩"<<VC<<"英语成绩"<<english<<endl;
					j++;
					s[i]=new stu(name,mtah,VC,english);
					i++;
					cout<<"数据录入成功,想继续录入吗?(y/n)"<<endl;
					cin>>c;
					flag2=0;
					do
					{
						int flag=0;
						cout<<"请输入你要查询的学生的姓名"<<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<<"的总成绩是"<<(*s[j]).getsum()<<endl<<"平均成绩是:"
									<<(*s[j].getaver()<<endl;
							}
						}
						if(flag=0)
							cout<<"对不起,没有您要查询的学生!"<<endl;
						cout<<"您想继续查询吗?(y/n)"<<endl;
						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,VC,english;
					char c;
					do
					{
						cout<<"请输入您要增加的学生的名字:"<<endl;
						cin>>name;
						cout<<"请输入数学成绩:"<<endl;
						cin>>math;
						cout<<"请输入VC成绩:"<<endl;
						cin>>VC;
						cout<<"请输入英语成绩:"<<endl;
						cin>>english;
						file[j]=new ofstream("d:\\document",ios::ate);
						*file[j]<<"姓名"<<name<<"数学成绩"<<math<<"VC成绩"<<VC<<"英语成绩"
	<<english<<endl;
						s[i]=new stu(name,math,VC,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的名字:"<<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<<"您要删除的对象不存在!请检查输入的正确性!";
					cout<<"要继续吗?(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':
			{
				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 flag=0;
						cout<<"请输入你要查询的学生的成绩"<<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(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'5':
				{
					char n[20];int j=0;char c;
					char name[20];double mat,chin,eng;flag2=0;
					char c;
					do
					{
						cout<<"请输入您要修改的学生的名字:"<<endl;
						cin<<name;
						for(int h=0;h,i;h++)
						{
							if(strcmp(name,s[h]->name==0)
							{
								flag2=1;
								cout<<"请输入新学生的数学成绩:"<<endl;
								cin>>mat;
								cout<<"请输入新学生的VC成绩:"<<endl;
								cin>>chin;
								cout<<"请输入新学生的英语成绩:"<<endl;
								cin>>eng;
								s[h]->eng;
								s[h]->VC=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;
					for(int k=0;k<i;k++)
					{
						cout<<k+1<<" "<<"姓名:"<<" "<<s[k]->name<<
							"VC:"<<" "<<s[k]->VC<<"数学:"<<" "<<s[k]->math<<"英语:"
							<<" "<<s[k]->english<<"总分:"<<" "<<(*s[k]).getsum()
							<<"平均分:"<<" "<<(*s[k]).getaver()<<endl;
					}
					break;
				}
			case'7':
				{
					int t;stu b;
					cout<<"本系统所有学生排名如下:"<<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<<"VC:"
							<<" "<<s[k]->VC<<"数学:"<<" "<<s[k]->math
							<<"英语:"<<" "<<s[k]->english<<"总分:"<<" "
							<<s[k]->getsum()<<"平均分:"<<" "<<s[k]->getaver()<<endl;
					}
					break;
				}
			case'8':
				{
					int t;stu b;
					cout<<"本系统所有学生语文排名如下:"<<endl;
					for(int x=0;x<i-1;x++)
					{
						t=x;
						for(int y=x+1;y<i;y++)
						{
							if((s[t]->VC)<(s[y]->VC))
								t=y;
							if(t!=x)
							{
								b=*s[t];
								*s[t]=*s[x];
								*s[x]=b;
							}
						}
					}
					if(i=o)
						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<<"VC:"
							<<" "<<s[k]->VC<<"数学:"<<" "<<s[k]->math
							<<"英语:"<<" "<<s[k]->english<<"总分:"<<
							" "<<s[k]->getsum<<"平均分:"<<" "<<s[k]->getaver
							<<endl;
					}
					break;
				}
			case'9':
				{
					int t;stu b;
					cout<<"本系统所有学生数学排名如下:"<<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;k<i;k++)
				{
                   cout<<k+1<<" "<<"姓名:"<<" "<<s[k]->name<<"VC:"
			       <<" "<<s[k]->VC<<"数学:"<<" "<<s[k]->math
				   <<"英语:"<<" "<<s[k]->english<<"总分:"<<" "
				   <<s[k]->getsum()<<"平均分:"<<" "<<s[k]->getaver()<<endl;
				}
				break;
		}
		case
	}
}