这个C ++运算子是什么意思？

Question

I have no idea about C++, and I need to change some code to other programming languages. Can someone tell me what the following line of code means?

double a = v(i) / 2. / sigma0 / sqrt(_R(i) / P(i));

Specifically, . / . / is not clear to me.

Answer 1

It's operator / , . is a part of the previous instruction, that means 2.0 .

Answer 2

Please notice that:

double a = v(i) / 2. / sigma0 / sqrt(_R(i) / P(i));

is different from:

double a = v(i) / 2 / sigma0 / sqrt(_R(i) / P(i));

As answered by other answers， / is clearly the division operator. And 2. means 2.0, adding a '.', as pointed out by comments under the original answer, makes it a floating point literal.

For more on how c++ handles similar situations, you may check these links:

http://www.cplusplus.com/doc/tutorial/operators/

http://www.learncpp.com/cpp-tutorial/44-implicit-type-conversion-coercion/