I have tried to display cylinder but it does not work. Only the spheres appear but no cylinder. Also how do I combine the spheres together to form a head and a body?

Code cpp:
/*
 * OGL02Animation.cpp: 3D Shapes with animation
 */
#include <windows.h>  // for MS Windows
#include <GL/glut.h>  // GLUT, include glu.h and gl.h
#include<stdlib.h>
 
/* Global variables */
char title[] = "3D Shapes with animation";
//GLfloat anglePyramid = 0.0f;  // Rotational angle for pyramid [NEW]
//GLfloat angleCube = 0.0f;     // Rotational angle for cube [NEW]
GLfloat angleSphere = 0.0f;  // Rotational angle for sphere [NEW]
GLfloat angleCylinder = 0.0f;  // Rotational angle for sphere [NEW]
GLUquadric* qobj;
GLdouble radius = 1.0f;
 
int refreshMills = 15;        // refresh interval in milliseconds [NEW]
 
/* Initialize OpenGL Graphics */
void initGL() {
   glClearColor(0.0f, 0.0f, 0.0f, 1.0f); // Set background color to black and opaque
   glClearDepth(1.0f);                   // Set background depth to farthest
   glEnable(GL_DEPTH_TEST);   // Enable depth testing for z-culling
   glDepthFunc(GL_LEQUAL);    // Set the type of depth-test
   glShadeModel(GL_SMOOTH);   // Enable smooth shading
   glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);  // Nice perspective corrections
}
 
 
/* Handler for window-repaint event. Called back when the window first appears and
   whenever the window needs to be re-painted. */
void display() {
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear color and depth buffers
   glMatrixMode(GL_MODELVIEW);     // To operate on model-view matrix
 
   //Draw head sphere
   glLoadIdentity();                 // Reset the model-view matrix
   glTranslatef(0.0f, 0.0f, -5.0f);  // Move right and into the screen
   glColor3f(0.9,0.3,0.2);
   glRotatef(angleSphere, 1.0f, 1.0f, 1.0f);  // Rotate about (1,1,1)-axis [NEW]
   glScalef(1.0f,1.0f,1.0f);
   glutWireSphere(radius,20,20);
   glFlush();
 
   //Draw body sphere
   glLoadIdentity();                 // Reset the model-view matrix
   glTranslatef(1.4f, 0.0f, -7.0f);  // Move right and into the screen
   glColor3f(0.9,0.3,0.2);
   glRotatef(angleSphere, 1.0f, 1.0f, 1.0f);  // Rotate about (1,1,1)-axis [NEW]
   glScalef(1.0f,1.0f,1.0f);
   glutWireSphere(radius,20,20);
   glFlush();
 
   //Draw cylinder
   glLoadIdentity();                 // Reset the model-view matrix
   qobj = gluNewQuadric();
   gluQuadricNormals(qobj, GLU_SMOOTH);
   glTranslatef(6.0f, 0.0f, -7.0f);  // Move right and into the screen
   glColor3f(0.9,0.3,0.2);
   glRotatef(angleCylinder, 1.0f, 1.0f, 1.0f);
   gluCylinder(qobj,1.0f,1.0f,7.0f,1,16);
   gluDeleteQuadric(qobj);
 
   glutSwapBuffers();  // Swap the front and back frame buffers (double buffering)
 
   // Update the rotational angle after each refresh [NEW]
   //anglePyramid += 0.2f;
   //angleCube -= 0.15f;
   angleSphere+= 0.3f;
   angleCylinder +=0.2f;
}
 
/* Called back when timer expired [NEW] */
void timer(int value) {
   glutPostRedisplay();      // Post re-paint request to activate display()
   glutTimerFunc(refreshMills, timer, 0); // next timer call milliseconds later
}
 
/* Handler for window re-size event. Called back when the window first appears and
   whenever the window is re-sized with its new width and height */
void reshape(GLsizei width, GLsizei height) {  // GLsizei for non-negative integer
   // Compute aspect ratio of the new window
   if (height == 0) height = 1;                // To prevent divide by 0
   GLfloat aspect = (GLfloat)width / (GLfloat)height;
 
   // Set the viewport to cover the new window
   glViewport(0, 0, width, height);
 
   // Set the aspect ratio of the clipping volume to match the viewport
   glMatrixMode(GL_PROJECTION);  // To operate on the Projection matrix
   glLoadIdentity();             // Reset
   // Enable perspective projection with fovy, aspect, zNear and zFar
   gluPerspective(45.0f, aspect, 0.1f, 100.0f);
}
 
/* Main function: GLUT runs as a console application starting at main() */
int main(int argc, char** argv) {
   glutInit(&argc, argv);            // Initialize GLUT
   glutInitDisplayMode(GLUT_DOUBLE); // Enable double buffered mode
   glutInitWindowSize(640, 480);   // Set the window's initial width & height
   glutInitWindowPosition(50, 50); // Position the window's initial top-left corner
   glutCreateWindow(title);          // Create window with the given title
   glutDisplayFunc(display);       // Register callback handler for window re-paint event
   glutReshapeFunc(reshape);       // Register callback handler for window re-size event
   initGL();                       // Our own OpenGL initialization
   glutTimerFunc(0, timer, 0);     // First timer call immediately [NEW]
   glutMainLoop();                 // Enter the infinite event-processing loop
   return 0;
}