课程首页在：http://blog.csdn.net/sxhelijian/article/details/11890759

【项目2-有序的结构体数组】使用同项目1相同的结构体类型，在main函数中已经对结构体数组进行了初始化，请完成相关函数的定义，实现main函数中要求的功能。

struct Student    //同项目1  
{  
    ……  
};  
void calculate(Student s[],int n);  //计算总分和均分，数据在s数组中，共有n个元素  
void sort1(Student [],int);      //按总分降序排序  
void sort2(Student [],int);      //按学号升序排序  
void output(Student [],int);     //输出成绩单  
void outputExcellent(Student [],int);  //输出优秀者：总分超285，单科不低于90  
int main()  
{  
    Student stu[]= {{"201152501104","Tom",65,69 ,68 },  
        {"201152501114","Jeery",94 ,89 ,63 },  
        {"201152501138","Speike",67 ,62 ,84 },  
        {"201152501204","Tyke",100 ,95 ,91 },  
        {"201152501202","Tuffy",59 ,80 ,55 },  
        {"201152501115","Butch",100 ,99 ,89 },  
        {"201152501201","Lightning",95 ,92 ,99 },  
        {"201152501145","Topsy",88 ,56 ,67 },  
        {"201152501203","Droopy",62 ,62 ,95 },  
        {"201152501140","Drupa",80 ,60 ,86 },  
        {"201152501205","Buzz",73 ,90 ,94}  
    };  
    int stuNum=sizeof(stu)/sizeof(stu[0]);  //用sizeof运算确定数组中元素个数  
    //计算总分和均分后输出  
    calculate(stu,stuNum);  
    cout<<"下面是成绩单:"<<endl;  
    output(stu,stuNum);  
    cout<<"优秀者名单:"<<endl;  
    outputExcellent(stu,stuNum);  
    //按总分降序排序后输出  
    sort1(stu,stuNum);  
    cout<<"按总分降序排序后:"<<endl;  
    output(stu,stuNum);  
    //按学号升序排序后输出  
    sort2(stu,stuNum);  
    cout<<"按学号升序排序后:"<<endl;  
    output(stu,stuNum);  
    return 0;  
}  

提示：(1)排序中涉及对数组元素的交换，数组元素可以作为整体赋值，如定义了Student t，赋值t=stu[i]、stu[j]=stu[i]都是合法的；(2)当涉及到字符数组表示的字符串的操作时，相关的函数需要#include<cstring>。

参考解答：

#include <iostream>
#include <cstring>
using namespace std;
struct Student
{
    char num[13];
    char name[10];
    int cpp;
    int math;
    int english;
    int grade;
    double average;
};
void calculate(Student s[],int n);  //计算总分和均分，数据在s数组中，共有n个元素
void sort1(Student [],int);      //按总分降序排序
void sort2(Student [],int);      //按学号升序排序
void output(Student [],int);     //输出成绩单
void outputExcellent(Student [],int);  //输出优秀者：总分超285，单科不低于90

int main()
{
    Student stu[]= {{"201152501104","Tom",65,69 ,68 },
        {"201152501114","Jeery",94 ,89 ,63 },
        {"201152501138","Speike",67 ,62 ,84 },
        {"201152501204","Tyke",100 ,95 ,91 },
        {"201152501202","Tuffy",59 ,80 ,55 },
        {"201152501115","Butch",100 ,99 ,89 },
        {"201152501201","Lightning",95 ,92 ,99 },
        {"201152501145","Topsy",88 ,56 ,67 },
        {"201152501203","Droopy",62 ,62 ,95 },
        {"201152501140","Drupa",80 ,60 ,86 },
        {"201152501205","Buzz",73 ,90 ,94}
    };
    int stuNum=sizeof(stu)/sizeof(stu[0]); //用sizeof运算确定数组中元素个数
    //计算总分和均分后输出
    calculate(stu,stuNum);
    cout<<"下面是成绩单:"<<endl;
    output(stu,stuNum);
    cout<<"优秀者名单:"<<endl;
    outputExcellent(stu,stuNum);

    //按总分降序排序后输出
    sort1(stu,stuNum);
    cout<<"按总分降序排序后:"<<endl;
    output(stu,stuNum);
    //按学号升序排序后输出
    sort2(stu,stuNum);
    cout<<"按学号升序排序后:"<<endl;
    output(stu,stuNum);
    return 0;
}

void calculate(Student s[],int n)  //计算总分和均分
{
    int i;
    for(i=0; i<n; i++)
    {
        s[i].grade=s[i].cpp+s[i].math+s[i].english;
        s[i].average=s[i].grade/3.0;
    }
    return;
}

void sort1(Student s[],int n)   //按总分降序排序
{
    int i,j;
    Student t;
    for(j=0; j<n-2; j++)
    {
        for(i=0; i<n-j-1; i++)
            if (s[i].grade<s[i+1].grade)
            {
                t=s[i];  //交换结构体
                s[i]=s[i+1];
                s[i+1]=t;
            }
    }
    return;
}
void sort2(Student s[],int n)   //按学号升序排序
{
    int i,j;
    Student t;
    for(j=0; j<n-2; j++)
    {
        for(i=0; i<n-j-1; i++)
            if (strcmp(s[i].num,s[i+1].num)>0)
            {
                t=s[i];
                s[i]=s[i+1];
                s[i+1]=t;
            }
    }
    return;
}

void output(Student s[],int n)  //输出成绩单
{
    int i;
    for(i=0; i<n; i++)
    {
        cout<<s[i].num<<", "<<s[i].name<<", ";
        cout<<s[i].cpp<<", "<<s[i].math<<", "<<s[i].english<<", ";
        cout<<s[i].grade<<", "<<s[i].average<<endl;
    }
    cout<<endl;
    return;
}

void outputExcellent(Student s[],int n)   //输出优秀者
{
    int i;
    for(i=0; i<n; i++)
        if(s[i].grade>=285&&s[i].cpp>=90&&s[i].math>=90&&s[i].english>=90)
        {
            cout<<s[i].num<<", "<<s[i].name<<", ";
            cout<<s[i].cpp<<", "<<s[i].math<<", "<<s[i].english<<", ";
            cout<<s[i].grade<<", "<<s[i].average<<endl;
        }
    cout<<endl;
    return;
}

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