OpenGl Vertex Array, how to use Vertex Array to draw a triangle
0. Create vertex array: vertices, normals and colors. 1. Enable vertex array. 2. Draw vertex array. 3. Disable vertex array. 
        glEnableClientState(GL_NORMAL_ARRAY);
        glEnableClientState(GL_COLOR_ARRAY);
        glEnableClientState(GL_VERTEX_ARRAY);

        glNormalPointer(GL_FLOAT, 0, normals1);
        glColorPointer(3, GL_FLOAT, 0, colors1);
        glVertexPointer(3, GL_FLOAT, 0, vertices1);

        // compute number of vertices 
        glDrawArrays(GL_TRIANGLES, 0, (sizeof(vertices1)/3)/sizeof(GLfloat));

        glDisableClientState(GL_VERTEX_ARRAY);  // disable vertex arrays
        glDisableClientState(GL_COLOR_ARRAY);
        glDisableClientState(GL_NORMAL_ARRAY);

Source Code