Adding an underscore or not adding an underline in front of a C++ variable will not affect the definition of the variable. It is just a matter of style. I prefer to add an underscore in front of member variables or private member variables. To indicate that the variable is an attribute of a certain class.
such as:
int size;
int getsize()
{
return size;
}
但是大多数人都不喜欢，觉得麻烦，就用了如下风格：
int _size;
int size()
{
return _size;
}
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