while loop not updating global variable in cpp

edit

hello everyone,

so i came across while loop not updating global variable in cpp

 #include "ros/ros.h"
 #include "std_msgs/Int32.h"
#include <fstream>
 #include <iostream>
int op1;
int start= 0;
int right;
 void rightCB(const std_msgs::Int32::ConstPtr& msg)
    {     
      right=msg->data;
        ROS_INFO("position of wheel1:[%d]",right);
    }

    int main(int argc, char **argv)
    {
        ros::init(argc, argv, "encoder");
        ros::NodeHandle n;

        ros::Subscriber enc = n.subscribe<std_msgs::Int32>("/right", 1000,&rightCB);

        while (ros::ok())
        {
            if(start == 0)
            {

                    int distx = op1 + 100;
                    ROS_INFO("Distance range:[%d]",distx);


                while(ros::ok())
                {

                    ROS_INFO("position of wheel1:[%d]",right);

                }
            }
            ros::spinOnce();
        }
        ros::spin();   
        return 0;
    }