main.cpp

#include<iostream>
#include<glad/glad.h>
#include<glfw/glfw3.h>

struct vec3
{
	float x, y, z;
};

int main()
{
	if (!glfwInit())
		return -1;

	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 6);
	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_COMPAT_PROFILE);
	GLFWwindow* m_window = glfwCreateWindow(500, 500, "Hello world!", nullptr, nullptr);
	glfwMakeContextCurrent(m_window);

	if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
		return -1;

	vec3 triverts[4] =
	{
		{0.5f,0.5f,0.0f},
		{0.5f,-0.5f,0.0f},
		{-0.5f,-0.5f,0.0f},
		{-0.5f,0.5f,0.0f}
	};

	unsigned int indices[6] =
	{
		0,1,3,1,2,3
	};

	GLuint m_vao = 0;
	glGenVertexArrays(1, &m_vao);
	glBindVertexArray(m_vao);

	GLuint m_vbo = 0;
	glGenBuffers(1, &m_vbo);
	glBindBuffer(GL_ARRAY_BUFFER, m_vbo);
	glBufferData(GL_ARRAY_BUFFER, 4 * sizeof(vec3), (void*)&triverts[0], GL_STATIC_DRAW);

	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
	glEnableVertexAttribArray(0);

	GLuint m_ebo = 0;
	glGenBuffers(1, &m_ebo);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_ebo);
	glBufferData(GL_ELEMENT_ARRAY_BUFFER, 6 * sizeof(unsigned int), (void*)&indices[0], GL_STATIC_DRAW);

	while (!glfwWindowShouldClose(m_window))
	{
		glfwPollEvents();

		glClearColor(1, 0, 0, 1);
		glClear(GL_COLOR_BUFFER_BIT);

		glBindVertexArray(m_vao);
		glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, nullptr);

		glfwSwapBuffers(m_window);
	}
	return 0;
}

it completely slipped my mind that you could use a struct to organize the array, that is a very nice change that you made, and it makes perfect sense too sense structs are just aligned right next to each other starting at zero