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[] = {};  // 全都赋值为0
     for(int i = ; i < ; i++)
     {
         cout << test[i] << endl;
         test[i]++;
 
     }
         std::cout << "=======================" << std::endl;
         for (int j = ; j < ; j++)
         {
             std::cout << test[j] << std::endl;
         }
         return ;
 } 

执行结果：

 
=======================

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, > s = { , , , , , , , , ,  };
 
     sort(s.begin(), s.end(), compare);
     for (auto a : s) {
         std::cout << a << " ";
     }
     std::cout << '\n' << '\n';
 
     vector<Line> lines;
     Line l1, l2;
     l1.p1 = cv::Point2i(, );
     l1.p2 = cv::Point2i(, );
 
     lines.push_back(l1);
 
     l2.p1 = cv::Point2i(, );
     l2.p2 = cv::Point2i(, );
     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 ;
 }

CMakeLists.txt

cmake_minimum_required(VERSION 3.9)
project(sort)
 
set(CMAKE_CXX_STANDARD )
FIND_PACKAGE(OpenCV REQUIRED)
 
add_executable(sort main.cpp)
TARGET_LINK_LIBRARIES(sort ${OpenCV_LIBS})

执行结果：

 
排序前：
 
排序后：
 
Process finished with exit code