OpenGL homework - Hello, triangle

1. use glDrawArrays（） Generate two connected triangles

#include<iostream>
#define GLEW_STATIC
#include <GL/glew.h>
#include<GLFW\glfw3.h>
using namespace std;




float vertices[] = {
	// first triangle
	-0.9f, -0.5f, 0.0f,  // left 
	-0.0f, -0.5f, 0.0f,  // right
	-0.45f, 0.5f, 0.0f,  // top 
	// second triangle
	 0.0f, -0.5f, 0.0f,  // left
	 0.9f, -0.5f, 0.0f,  // right
	 0.45f, 0.5f, 0.0f,   // top 
	 
};





void processInput(GLFWwindow* window) {
	// Check if... Is pressed ESC
	if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS) {
		// close window 
		glfwSetWindowShouldClose(window, true);
	}

}
const char* vertexShaderSource = "#version 330 core\n"
"layout (location = 0) in vec3 aPos;\n"
"void main()\n"
"{\n"
"   gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"
"}\0";

const char* fragmentShaderSource = "#version 330 core\n"
"out vec4 FragColor;\n"
"void main()\n"
"{\n&#