sscanf for doubles

This is a simple problem, but I can't see it:

  char *s = "f 8.649292" ;
  double d ;
  sscanf( s, "f %f", &d ) ;

  printf( "d is %f\n", d ) ;

Why is d not containing开发者_开发技巧 the double value 8.649292?

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Oh wait, nevermind. d needs to be a float.

And to make it work you could use %lf for a double

  char *s = "f 8.649292 " ;
  double d ;
  sscanf( s, "f %lf", &d ) ;

  printf( "d is %lf\n", d ) ;