c 中整数后面的点 (.) 是什么意思? [英] What is the meaning of a dot (.) after an integer in c?

问题描述

我想知道是否有人知道 .在 C 中的整数表示之后.

I would like to know if anybody knew what a . after an integer in C means.

我有一段我想转换的代码，这是我唯一不确定它做什么的.

i have this piece of code i want to convert and that is the only thing i am not sure of what it does.

如果(y>=0.)有什么用.在这儿吗?

if (y>=0.) what does the . here do?

完整代码:

double angleOf(double x, double y) {

  double  dist=sqrt(x*x+y*y) ;

  if (y>=0.) return acos( x/dist);
  else       return acos(-x/dist)+.5*CIRCLE_RADIANS; }

推荐答案

和 0.0 一样，它会把它当作 double 而不是整数，所以你不需要转换它.

It's same as 0.0, it will treat it as double instead of an integer, so you don't need to cast it.

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