C++数组,sort

cmake_minimum_required(VERSION 3.5)
project(Test)

add_executable( te test.cpp )

test.cpp

#include <stdlib.h>
#include <iostream>
#include <stdio.h>
#include <fstream>
using namespace std;
int main()
{
    int test[10] = {0};  // 全都赋值为0
    for(int i = 0; i < 10; i++)
    {
        cout << test[i] << endl;        
        test[i]++;

    } 
        std::cout << "=======================" << std::endl;
        for (int j = 0; j < 10; j++)
        {
            std::cout << test[j] << std::endl;
        }
        return 0;
} 

执行结果：

0
0
0
0
0
0
0
0
0
0
=======================
1
1
1
1
1
1
1
1
1
1

sort

sort.cpp

#include <iostream>
#include <array>
#include <algorithm>
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"

using namespace std;

struct Line{    // 大写
    cv::Point2i p1, p2;
};

bool compare(int a, int b)
{
    return a < b;
}

bool cpr(Line l1, Line l2){
    return l1.p2.y > l2.p2.y;
}


int main() {
    std::array<int, 10> s = { 5, 7, 4, 2, 8, 6, 1, 9, 0, 3 };

    sort(s.begin(), s.end(), compare);
    for (auto a : s) {
        std::cout << a << " ";
    }
    std::cout << '
' << '
';

    vector<Line> lines;
    Line l1, l2;
    l1.p1 = cv::Point2i(1, 2);
    l1.p2 = cv::Point2i(7, 3);

    lines.push_back(l1);

    l2.p1 = cv::Point2i(3, 10);
    l2.p2 = cv::Point2i(8, 9);
    lines.push_back(l2);
    cout << "排序前：" << endl;
    for (auto & l : lines){
        cout << l.p1.x << " " << l.p1.y << " " << l.p2.x << " " << l.p2.y << endl;
    }

    sort(lines.begin(), lines.end(), cpr);
    cout << "排序后：" << endl;
    for (auto & l : lines){
        cout << l.p1.x << " " << l.p1.y << " " << l.p2.x << " " << l.p2.y << endl;
    }

    return 0;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.9)
project(sort)

set(CMAKE_CXX_STANDARD 11)
FIND_PACKAGE(OpenCV REQUIRED)

add_executable(sort main.cpp)
TARGET_LINK_LIBRARIES(sort ${OpenCV_LIBS})

执行结果：

0 1 2 3 4 5 6 7 8 9 

排序前：
1 2 7 3
3 10 8 9
排序后：
3 10 8 9
1 2 7 3

Process finished with exit code 0