c++标准库之sort排序

  sort--01：

 1 #include "iostream"
#include "algorithm"
#include "string.h"
using namespace std;

 // student 结构体
struct Student
{
    char name[20];
    int id;
    double Jd;

};

 //按首字母排序

struct studentrule1 
{
    bool operator() (const Student & s1, const Student &s2)
    {
        if(stricmp(s1.name,s2.name)<0)
            return true;
    return false;
    }
};
// 按id 小到大
struct studentrule2
{
    bool operator()(const Student &s1,const Student &s2)
    {
        return s1.id<s2.id;
    }
};

 // 按Jd大到小
struct studentrule3
{
    bool operator()(const Student &s1,const Student &s2)
    {
        return s1.Jd>s2.Jd ;
    }
};
 //输出函数
void Print(Student a[],int size)
{
        cout<<"-------------------
  name  id  Jd 
-------------------


";
for (int i=0;i<size;i++)
{
    cout<<"  "<<a[i].name<<"   "<<a[i].id<<"   "<<a[i].Jd<<"
";
}
}

 // 初始化
Student student[]=
{
    {"Aack",110,3.9},{"Cary",109,3.5},
    {"Bob",108,3.3},{"Zerol",111,3.2},
    {"Jaeger",112,3.0},{"Dick",107,3.8}

};
int main()
{
    
    int n =sizeof(student)/sizeof(Student);
    sort(student,student+n,studentrule1());
    Print(student,n);
    sort(student,student+n,studentrule2());
    Print(student,n);
    sort(student,student+n,studentrule3());
    Print(student,n);
    system("pause");
    return 0;
     
}

运行结果：

  // sort--02： 按个位数排序
 1 #include"iostream"
#include "string.h"
#include "algorithm"
using namespace std;
struct MyStruct
{
    bool operator()(const int &n1,const int &n2)
    {
    return n1%10<n2%10;
    }

};

void Print(int a[],int size)
{
for (int i=0;i<size;i++)
{
    cout<<a[i]<<" ";
}
cout<<"
";
}
int main()
{
    int a[]={20,27,79,62,53,101,288,74,56,95};25     int n =sizeof(a)/sizeof(int);
    sort(a,a+n,MyStruct());
    Print(a,n);
    system("pause");
    return 0;
}

运行结果：