Syntax 
  do instruction while ( condition );

#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */
 
 
int main( void ) {
int i;
 
    do
        printf("Hello World no %i\n",i);
    while (i++);
 
return 0;
}

  output
  user@host~:# ./do
  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