Puzzle E3

What is written by the following?

#include <stdio.h>
#include <stdlib.h>

/* Puzzle E03 -- match */
int main()
{
  printf("Expression evaluates to: %f\n", 45.0 );
  return 0;
}

The data type of an explicit floating point value like 45.0 is double. This is because most floating point calculation should be done at least at the level of double precision.