如何使float表现为double？

Question

Is there some compiler flag in gcc to consider floats as doubles ? I tried

#define float double

but it creates havoc in many headers and compilation fails stating

ublic/sdk/inc/crt/float.h:5:40: fatal error: ../include/double.h: No such file or directory
At that line it was including float

I then tried doing

  typedef float double;

but it fails saying

 error: multiple types in one declaration

I am looking at some compiler flag which can do this for me.

Answer 1

There is no such thing. That's why you use different types. What you could do is replace " float " by " double " in your source code.