五：排序
对vector整形进行排序
#include "stdlib.h"
#include <vector>
#include <algorithm>
using namespace std;
//升序比较函数
int compare1(const int &a, const int &b)
{
return a < b;
}
//降序比较函数
int compare2(const int &a, const int &b)
{
return a > b;
}
int main()
{
vector<int> v;
for (int i=0; i<10; i++)
{
v.push_back(rand() % 10);
}
//遍历输出
printf("排序前数据：");
for (vector<int>::iterator it = v.begin(); it != v.end(); it++)
{
printf("%d ", *it);
}
//升序排序
sort(v.begin(), v.end(), compare1);
//遍历输出
printf("n升序后数据：");
for (vector<int>::iterator it = v.begin(); it != v.end(); it++)
{
printf("%d ", *it);
}
//降序排序
sort(v.begin(), v.end(), greater<int>());
//遍历输出
printf("n降序后数据：");
for (vector<int>::iterator it = v.begin(); it != v.end(); it++)
{
printf("%d ", *it);
}
getchar();
return 1;
}
对存放类成员变量排序
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
class Student {
public:
Student(string n, int c) :name(n), core(c) {}
string name;
int core;
};
//升序比较函数
bool compare1(const Student& s1, const Student& s2)
{
return s1.core < s2.core;
}
//降序比较函数
bool compare2(const Student& s1, const Student& s2)
{
return s1.core > s2.core;
}
int main()
{
vector<Student> v;
Student s1("aaaa", 97);
Student s2("bbbb", 99);
Student s3("cccc", 95);
v.push_back(s1);
v.push_back(s2);
v.push_back(s3);
printf("排序前数据：n");
for (vector<Student>::iterator it = v.begin(); it != v.end(); it++)
{
printf("%s; %dn", ((*it).name).c_str(), (*it).core);
}
//升序排序
sort(v.begin(), v.end(), compare1);
printf("n升序后的数据：n");
for (vector<Student>::iterator it = v.begin(); it != v.end(); it++)
{
printf("%s; %dn", ((*it).name).c_str(), (*it).core);
}
//降序排序
sort(v.begin(), v.end(), compare2);
printf("n降序后的数据：n");
for (vector<Student>::iterator it = v.begin(); it != v.end(); it++)
{
printf("%s; %dn", ((*it).name).c_str(), (*it).core);
}
getchar();
return 1;
}
