Segmentation Fault (Core Dumped) [closed]

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Hi all,

I am a new ROS user. I was going through the Publisher and Subscriber tutorials and I attempted to try out the same with an Integer data type. So I made two nodes.

My publisher node :

#include "ros/ros.h"
#include <std_msgs/Int16.h>
int main(int argc, char **argv)
{
 //Initialization
 ros::init(argc, argv, "pub_node");
 ros::NodeHandle p;
 ros::Publisher my_var = p.advertise<std_msgs::Int16>("my_topic", 1000);
 ros::Rate loop_rate(1);
 int count = 0;

 //loop
 while (ros::ok())
 {
 std_msgs::Int16 dog;
 dog.data = count;
 my_var.publish(dog);
 ros::spinOnce();
 loop_rate.sleep();
 ++count;
 }
return 0;
}

My subscriber node :

#include "ros/ros.h"
#include "std_msgs/Int16.h"

void sub_call(const std_msgs::Int16::ConstPtr& msg)
{
  ROS_INFO("I heard: [%s]", msg->data);
}

int main(int argc, char **argv)
{
ros::init(argc, argv, "my_sub");
ros::NodeHandle n;
ros::Subscriber sub = n.subscribe("my_topic", 1000, sub_call);
ros::spin();
return 0;
}

I am able to build these both. I can run the publisher node and I can see the data being published through

$ rostopic echo /my_topic

The problem is that as soon as I run the subscriber node, it shows

Segmentation fault (core dumped)

and the subscriber node is stopped.

What does this mean?