C++ OpenGL Shaders not working -

i've started learning c++ , i'm trying make program shaders draws triangle colors.

this vertex shader:

const glchar* vertexsource = "#version 150 core\n" "in vec4 position;" "in vec4 color;" "out vec4 color;" "out vec4 gl_position;" "void main(){" "   gl_position = position;" "   color = color;" "}"; 

and fragment shader:

const glchar* fragmentsource = "#version 150 core\n" "in vec4 color;" "out vec4 gl_fragcolor" "void main(){" "    gl_fragcolor = color;" "}"; 

i have list of values co-ords , colors respectively:

float vertices[]{     -1.0f, -1.0f, 0.0f,1.0f,   1.0f,0.0f,0.0f,1.0f,     1.0f, -1.0f, 0.0f,1.0f,    0.0f,1.0f,0.0f,1.0f,     0.0f,  1.0f, 0.0f,1.0f,    0.0f,0.0f,1.0f,1.0f, }; 

i initialise 'vertex buffer object' , 'vertex array object'

gluint vao; //initialise vertex array object glgenvertexarrays(1, &vao); glbindvertexarray(vao);  gluint vbo; //initialise vertex buffer object glgenbuffers(1,&vbo); glbindbuffer(gl_array_buffer,vbo); glbufferdata(gl_array_buffer,sizeof(vertices),vertices,gl_static_draw); 

i compile shader program:

gluint vertexshader = glcreateshader(gl_vertex_shader); glshadersource(vertexshader, 1, &vertexsource, null); glcompileshader(vertexshader);  gluint fragmentshader = glcreateshader(gl_fragment_shader); glshadersource(fragmentshader, 1, &fragmentsource, null); glcompileshader(fragmentshader);  gluint shaderprogram = glcreateprogram(); glattachshader(shaderprogram, vertexshader); glattachshader(shaderprogram, fragmentshader); gllinkprogram(shaderprogram);  gluseprogram(shaderprogram); 

i define attributes shaders:

glbindattriblocation(shaderprogram, 0, "position"); glvertexattribpointer(0, 4, gl_float, gl_false, 8 * sizeof(float), 0); glenablevertexattribarray(0);  glbindattriblocation(shaderprogram, 1 ,"color"); glvertexattribpointer(1, 4, gl_float, gl_false, 8 * sizeof(float), (void*)(4 * sizeof(float))); glenablevertexattribarray(1); 

and draw triangle in 'do, while' loop

gldrawarrays(gl_triangles, 0, 3); 

however, doesn't print triangles, instead shows black screen.

i got of code tutorials online, , i'm trying rewrite out understand how works.

could see went wrong? advice appreciated :)

edit:

i've added code check errors:

if (status == gl_false) {     glint infologlength;     glgetshaderiv(shaderprogram, gl_info_log_length, &infologlength);      glchar* strinfolog = new glchar[infologlength + 1];     glgetprograminfolog(shaderprogram, infologlength, null, strinfolog);      std::cout << strinfolog;     delete[] strinfolog; } 

...but nothing prints

gl_position pre defined built in variable , glsl compiler surely complaining trying redefining , errors out. gl_fragcolor in reserved namespace.

of course code lacks queries of shader info log, don't see compiler output; addendum queries program linker log.

the solution easy omitting out vec4 gl_position , out vec4 gl_fragcolor shader sources.