OpenGL 3.3 won't draw my triangle - c

Question

I'm following these tutorials using C instead of C++:
Tutorial 2, short extension to tutorial 2.
The only change I made to port it was changing Vector3f[3] into GLfloat[9]. The version with GLfloat[1] instead of Vector3f[1] works correctly. I think this change might be the reason of glDrawArrays not working but I don't know how to fix it.
#include <stdio.h>
#include <GL/glew.h>
#include <GL/freeglut.h>
GLuint VBO_id;
static void RenderSceneCB()
{
glClear(GL_COLOR_BUFFER_BIT);
glEnableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, VBO_id);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
glDrawArrays(GL_TRIANGLES, 0, 3);
glDisableVertexAttribArray(0);
glutSwapBuffers();
}
static void CreateVertexBuffer()
{
GLfloat Vertices[9] = { -1.0f, -1.0f, 0.0f, 1.0f, -1.0f, 0.0f, 0.0f,
1.0f, 0.0f };
glGenBuffers(1, &VBO_id);
glBindBuffer(GL_ARRAY_BUFFER, VBO_id);
glBufferData(GL_ARRAY_BUFFER, sizeof(Vertices), Vertices,
GL_STATIC_DRAW);
}
int main(int argc, char **argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA);
glutInitWindowSize(600, 600);
glutInitWindowPosition(100, 100);
glutCreateWindow("Tutorial 03");
glutDisplayFunc(RenderSceneCB);
GLenum res = glewInit();
if (res != GLEW_OK) {
fprintf(stderr, "Error: '%s'\n", glewGetErrorString(res));
return 1;
}
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
CreateVertexBuffer();
glutMainLoop();
return 0;
}

Answer 1

From here.
OpenGL 3.0 was the last revision of the specification which fully supported both fixed and programmable functionality. Even so, most hardware since the OpenGL 2.0 generation lacked the actual fixed-function hardware. Instead, fixed-function processes are emulated with shaders built by the system.
In OpenGL 3.2, the Core Profile lacks these fixed-function concepts. The compatibility profile keeps them around. However, most newer features of OpenGL cannot work with fixed function, even when it might seem theoretically possible for them to interact.
Sounds like your version of OpenGL doesn't support the fixed function pipeline. Either use an older version of OpenGL that does or write and load a shader as shown in Tutorial 4.