#include <stdio.h>
          void main()
{
 	  int test;
  	  test=1;
                 while(test)
                      {
              test= function1( );
  	   	if(test) test= function2( );
 	   	if(test) test= function3( );
 	  	 if(test) test= function4( );
                       }
  	}