#include <vector>
#include <ctime>
#include <iostream>
#include <fstream>
using namespace std;
 
 
void main(){
	ofstream flux("haaaaaaa.txt");
	double start, finish, duration;
	int N;
	int n;
	N=5000000;
	n=2;
 
 
	start   =   clock();
	double *temp= new double[N];
	for(int i=0;i<N;i++){
		temp[i]=99;
	}
	finish   =   clock();  
	duration   =   (double)(finish   -   start); 
	flux<<"预留空间+刷新整个动态数组需要"<<duration<<"毫秒..."<<endl<<endl<<endl<<endl;
 
	start   =   clock();
	double **temp1= new double *[n];
	for(int i=0;i<n;i++){
		temp1[i] = new double [N];
	}
	for(int i=0;i<n;i++){
		for(int j=0;j<N;j++){
			temp1[i][j]=1;
		}
	}
	finish   =   clock();  
	duration   =   (double)(finish   -   start); 
	flux<<"预留空间+刷新二维动态数组需要"<<duration<<"毫秒..."<<endl<<endl<<endl<<endl;
	flux<<temp1[1][100]<<endl;
 
	start   =   clock();
	double **temp2=new double *[n];
	temp2[0]= new double [N*n];
	for(int i=1;i<n;i++){
		temp2[i]=temp2[i-1]+N;
	}
	for(int i=0;i<n;i++){
		for(int j=0;j<N;j++){
			temp2[i][j]=11;
		}
	}
	finish   =   clock();  
	duration   =   (double)(finish   -   start); 
	flux<<"构造改进版连续存储二维动态数组需要"<<duration<<"毫秒..."<<endl<<endl<<endl<<endl;
	flux<<temp2[1][100]<<endl;
 
 
	start	=clock();
	vector<double> test;
	vector<pair<double,double>> test2;
	vector<vector<double>> test3;
	finish =clock();
	duration   =   (double)(finish   -   start); 
	flux<<"vector初始化用掉"<<duration<<"毫秒..."<<endl<<endl<<endl<<endl;
 
	start   =   clock();
	test.resize(N,1);
	finish   =   clock();  
	duration   =   (double)(finish   -   start); 
	flux<<"vector用resize来预留空间需要"<<duration<<"毫秒..."<<endl<<endl<<endl<<endl;
	flux<<test.size()<<endl;
	test.clear();
 
	start   =   clock();
	for(int i=0;i<N;i++){
		test.push_back(1);
	}
	finish   =   clock();  
	duration   =   (double)(finish   -   start); 
	flux<<"vector如果用pushback需要"<<duration<<"毫秒..."<<endl<<endl<<endl<<endl;
	flux<<test.size()<<endl;
	//test.clear();
 
	start   =   clock();
	for(int i=0;i<N;i++){
		test[i]=99;
	}
	finish   =   clock();  
	duration   =   (double)(finish   -   start); 
	flux<<"刷新这个vector里面的所有值需要"<<duration<<"毫秒..."<<endl<<endl<<endl<<endl;
	test.clear();
 
	start   =   clock();
	for(int i=0;i<n;i++){
		for(int j=0;j<N;j++){
			test.push_back(99);
		}
		test3.push_back(test);
		test.clear();
	}
	finish   =   clock();  
	duration   =   (double)(finish   -   start); 
	flux<<"使用vector的vector来pushback构造多维数组需要"<<duration<<"毫秒..."<<endl<<endl<<endl<<endl;
	test.clear();
 
 
 
	start   =   clock();
	for(int i=0;i<N;i++){
		test2.push_back(make_pair(1,1));
	}
	finish   =   clock();  
	duration   =   (double)(finish   -   start); 
	flux<<"一个使用pair类型的vector来pushback需要"<<duration<<"毫秒..."<<endl<<endl<<endl<<endl;
 
 
 
	delete [] temp;
	for(int i=0;i<n;i++){
		delete [] temp1[i];
	}
	delete [] temp1;
	delete [] temp2[0];
	delete [] temp2;
	flux.close();
 
 
	char wengding;
	cin>>wengding;
 
};

#include <stdio.h>
#include <windows.h>
#include <gl/glut.h>
 
int main(int argc, char** argv)
{
glutInit(&argc,argv);
//显示模式初始化
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB|GLUT_DEPTH);
//定义窗口大小
glutInitWindowSize(300,300);
//定义窗口位置
glutInitWindowPosition(100,100);
//创建窗口
glutCreateWindow("testgl");
const char* version = (const char*)glGetString(GL_VERSION);
printf("OpenGL 版本：%s\n", version);
glutMainLoop();
return 0;
}

// Draw the "dot plots" of a function
//P52 in <Computer Graphics Using OpenGL(Second Edition)>
 
#include<math.h>
#include<GL/glut.h>
 
const int screenWidth = 640;   // width of screen window in pixels
const int screenHeight = 480;  // height of screen window in pixels
GLdouble A,B,C,D; // values used for scaling and shifting
 
//----------Initialization--------------
void init(void)
{
    glClearColor(1.0,1.0,1.0,0.0); // Set white background color
    glColor3f(0.0f,0.0f,0.0f);    // Drawing color is black
    glPointSize(2.0);             // a 'dot' is 2 by 2 pixels
    glMatrixMode(GL_PROJECTION);  // Set "camera shape"
    glLoadIdentity();
    gluOrtho2D(0.0,(GLdouble)screenWidth,0.0,(GLdouble)screenHeight);
    // Set values used for scaling and shifting
    A = screenWidth/4.0;
    B = 0.0;
    C = D = screenHeight/2.0;
 
}
 
// --------Draw the "dot plots" of a function------
void dotPlots(void)
{
    glClear(GL_COLOR_BUFFER_BIT);       //clear the screen
    glBegin(GL_POINTS);
        for(GLdouble x = 0;x<4.0;x += 0.005)
        {
            GLdouble func = exp(-x) * cos(2*3.14159265*x);
            glVertex2d(A*x+B,C*func+D);
        }
    glEnd();
    // Draw a horizontal line
    glBegin(GL_LINES);
        glVertex2i(0,screenHeight/2);
        glVertex2i(screenWidth,screenHeight/2);
    glEnd();
    glFlush(); //send all output to display
}
 
//--------main-----------
void main(int argc,char** argv)
{
    glutInit(&argc, argv);  // Initialize the toolkit
    glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);  // Set display mode
    glutInitWindowPosition(100, 150);  // Set window pozition on screen
    glutInitWindowSize(screenWidth, screenHeight);      // Set window size
    glutCreateWindow("Dot plot of a Function"); // Open the screen window
    glutDisplayFunc(dotPlots); // Register redraw function 
    init();
    glutMainLoop();  // Go into a perpetual loop
//在上面的 dotPlot（）中的for循环里做一些更改就可以画另一个函数图了
}