c++ opengl 4.5 doesn't show the object - c++

Question

I writed code which must to show triangle but it doesn't. I really don't know where is problem. I checked everything and don't find out what is the problem. If you can please help me.
Here is code:
#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <glm.hpp>
int width = 800, height = 600;
int main() {
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 5);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
GLFWwindow* window = glfwCreateWindow(width, height, "engine", NULL, NULL);
glfwMakeContextCurrent(window);
gladLoadGLLoader((GLADloadproc)glfwGetProcAddress);
glViewport(0, 0, width, height);
const char* VertexShaderData = "#version 450 core\n"
"layout(location = 0) in vec2 pos;\n"
"void main(){\n"
"gl_Position = vec4(pos, 0, 1);\n"
"}\0";
GLuint VertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(VertexShader, 1, &VertexShaderData, NULL);
glCompileShader(VertexShader);
const char* FragmentShaderData = "#version 450 core\n"
"out vec4 Color;\n"
"void main(){\n"
"Color = vec4(0.25, 0.8, 0.65, 1);\n"
"}\0";
GLuint FragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(FragmentShader, 1, &FragmentShaderData, NULL);
glCompileShader(FragmentShader);
GLuint ShaderProgram = glCreateProgram();
glAttachShader(ShaderProgram, VertexShader);
glAttachShader(ShaderProgram, FragmentShader);
glLinkProgram(ShaderProgram);
float Points[] = { -1, -1, 0, 1, 1, -1 };
GLuint VAO, VBO;
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &VBO);
glBindVertexArray(VAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 2*sizeof(float), (void*)0);
glBufferData(GL_ARRAY_BUFFER, 6, Points, GL_STATIC_DRAW);
glClearColor(0.3, 0.5, 0.7, 1);
while (!glfwWindowShouldClose(window)) {
glfwSwapBuffers(window);
glClear(GL_COLOR_BUFFER_BIT);
glBindVertexArray(VAO);
glEnableVertexAttribArray(0);
glUseProgram(ShaderProgram);
glDrawArrays(GL_TRIANGLES, 0, 3);
}
}
Before I was believe what problem is in array, but now i don't think so. Problem is must be in something else.

Answer 1

The 2nd argument to glBufferData is the size of the buffer in bytes:
glBufferData(GL_ARRAY_BUFFER, 6, Points, GL_STATIC_DRAW);
glBufferData(GL_ARRAY_BUFFER, 6*sizeof(float), Points, GL_STATIC_DRAW);