classaverage.cpp

学校的教学管理系统

#include"head.h"
#include<iostream.h>

extern void SortEachClass(Student* &);

void ClassAverage(Student* &head)
{
	Student *pGuard;
	Student *p;
	double Average[MAX];   //各科目平均成绩
	double TotalAverage;   //总平均成绩
	int ClassNum;          //链表中的班级数
	int EachClassNum;      //每个班级的学生数

	SortEachClass(head);

	for(ClassNum=1,pGuard=head,p=pGuard;pGuard!=NULL;pGuard=pGuard->next)
	{
		if(pGuard->Class!=p->Class)
		{
			ClassNum++;
		}
		p=pGuard;
	}                           //求出班级个数
	
	pGuard=head;

	for(int icount=0;icount<ClassNum;icount++)
	{
		for(int i=0;i<MAX;i++)
		{                     
			Average[i]=0;
		}
		TotalAverage=0; 
		EachClassNum=0;    //以上把所有数据置为0
		
	/*	p=pGuard;
		pGuard=p->next;
		do
		{
			EachClassNum++;          //每个班级的学生数自增
			TotalAverage+=p->Average;
			for(int i=0;i<MAX;i++)
			{
				Average[i]+=p->Score[i];
			}
			
			p=pGuard;
			pGuard=pGuard->next;
		}
		while(pGuard!=NULL&&p->Class==pGuard->Class);*/

		for(p=pGuard,pGuard=pGuard->next;pGuard!=NULL&&p->Class==pGuard->Class;pGuard=pGuard->next)
		{
			EachClassNum++;          //每个班级的学生数自增
			TotalAverage+=p->Average;
			for(int i=0;i<MAX;i++)
			{
				Average[i]+=p->Score[i];
			}
			p=pGuard;
		}
		if(pGuard==NULL)             //当pGuard为NULL时,还需要加上p节点否则结果会出错
		{
			EachClassNum++;          
			TotalAverage+=p->Average;
			for(int i=0;i<MAX;i++)
			{
				Average[i]+=p->Score[i];
			}
		}

		TotalAverage/=EachClassNum;
		for(int count=0;count<MAX;count++)
		{
			Average[count]/=EachClassNum;
		}

		cout<<"		"<<p->Class<<"班各科目的平均成绩如下:"<<endl;
		cout<<"			微积分平均成绩:		"<<Average[0]<<endl;
		
		cout<<"			物理平均成绩:		"<<Average[1]<<endl;

		cout<<"			英语平均成绩:		"<<Average[2]<<endl;

		cout<<"			C语言平均成绩:		"<<Average[3]<<endl;

		cout<<"			体育平均成绩:		"<<Average[4]<<endl;

		cout<<"		所有科目的平均成绩为:		"<<TotalAverage<<endl<<endl<<endl;		

	}
}