Syntax 
  do instruction while ( condition );

#include <iostream> /* including standard library */
 
using namespace std;
 
int main( void ) {
int i;
 
    do
        cout << "Hello World no " << i << endl;
    while (i++);
 
return 0;
}

  output
  Hello World no 0
  Hello World no 1
  Hello World no 2
  Hello World no 3
  Hello World no 4
  Hello World no ...
  Hello World no 1579
  
  and so on