Why is getcwd() not ISO C++ compliant?

Question

This MSDN article states that getcwd() has been deprecated and that the ISO C++ compatible _getcwd should be used instead, which raises the question: what makes getcwd() not

Answer 1

Functions not specified in the standard are supposed to be prefixed by an underscore as an indication that they're vendor-specific extensions or adhere to a non-ISO standard. Thus the "compliance" here was for Microsoft to add an underscore to the name of this specific function since it's not part of the ISO standard.