Check out example codes for "c++ hello world program". It will help you in understanding the concepts better.

Code Example 1

#include<iostream>
using namespace std;

int main(){
 
  cout << "Hello World" << endl;
  
  return 0;
}

Code Example 2

#include<iostream>  
  
using namespace std; 
  // @2903
// main function - 
// where the execution of program begins 
int main() 
{ 
    // prints hello world 
    cout<<"Hello World"; 
      
    return 0; 
}

Code Example 3

#include <iostream>


int main(){
 std::cout <<"Hello World" << std::endl;
 return 0;
}

Code Example 4

#include <bits/stdc++.h>

using namespace std;

int main(){
	cout << "hello world! \n"; 
}                                                     //code by goukl aakash

Learn ReactJs, React Native from akashmittal.com