Why does Visual Studio 2013 error on C4996?

Question

In previous versions of Visual Studio using functions like _sleep or strncpy just outputs a warning. In the latest version, it\'s suddenly an error:

Answer 1

Compiling all sources I have referred:

Remove secure warnings (_CRT_SECURE_NO_WARNINGS) from projects by default in Visual Studio

kmcnamee's answer on How to use use _CRT_SECURE_NO_WARNINGS

Video that solved my problem. https://www.youtube.com/watch?v=qWxGZLjwKL0

Apparently, Security Development Lifecycle (SDL) recommended checks which include enabling additional secure code generation features and extra security-relevant warnings as errors.

The steps to solve this issue are:

1. Go to Project-> "your project name" Properties
2. Under Configuration Properties, go to C/C++
3. Under C/C++, go to Preprocessor 
4. Select Preprocessor Definitions and click on Edit from the dropdown menu
5. In the blank space fill out _CRT_SECURE_NO_WARNINGS