This is my vertex shader:

static const GLchar * vertex_shader_source[] =
    {
        "#version 430 core                                  \n"
        "layout (location = 0) in vec4 offset;              \n"
        "void main(void)                                    \n"
        "{                                                  \n"
        "   const vec4 vertices[3] = vec4[3](vec4( 0.25, -0.25, 0.5, 1.0),\n"
        "   vec4(-0.25, -0.25, 0.5, 1.0),                   \n"
        "   vec4( 0.25,  0.25, 0.5, 1.0));                  \n"
        "   gl_Position = vertices[gl_VertexID] + offset;   \n"
        "}                                                  \n"
    };

and this is what im trying to do:

glUseProgram(rendering_program);
        GLfloat attrib[] = { (float)sin(currentTime) * 0.5f,
            (float)cos(currentTime) * 0.6f,
            0.0f, 0.0f };

        glVertexAttrib4fv(0, attrib);
        glDrawArrays(GL_TRIANGLES, 0, 3);

currentTime - The number in seconds since the program has started.

Expected result - Triangle moving around the window.

Its from the SuperBible book (sixth edition), this is the full code:http://pastebin.com/xA3eCKz1

The triangle should move across the screen but it doesn't.