c++ - 是否有用于指定 double 的数字后缀？

Question

void Foo(float  a){}  //1
void Foo(double a){}  //2 overloaded


Foo(1.0f);                           //calls function 1
Foo(1.0 /*double numeric suffix?*/); //calls function 2

如果不是，那么强制转换是实现此目的的唯一方法吗？我主要感兴趣在某些操作等过程中确保 double 学:

ulong j;
double v;

j = /*some value*/;
if(j>0UL)
  v = 1.0 / j;  //if 1.0 is set as a float by the compiler then
                //could it be likely we lose some precision here 
                //if a double would allow for more precision?  Is
                //a cast the only means of ensuring double precision?

有关允许编译器在操作期间自动确定类型的其他提示会有所帮助。

Answer 1

C++ 中不需要后缀。默认情况下，任何缺少“f”后缀的浮点值都将被键入编译器类型 double。

引用:http://en.wikipedia.org/wiki/C_0x