Cause of error
The VS platform considers the scanf function unsafe and requires that it be replaced with the scanf_s function
prescription
Option 1: Replace scanf with scanf_s [not recommended]
Replace scanf with scanf_s
However, the scanf_s function can only be used on vs, and cannot be used on other platforms, so the modified code cannot be ported and is not recommended.
Option 2: #define _CRT_SECURE_NO_WARNINGS
Add preprocessor directive before header file #define _CRT_SECURE_NO_WARNINGS
The following method can be used to have this preprocessor directive added automatically to all subsequent projects:
Look for the newc++ file in the vs installation path and add this preprocessor directive to the first line of the file #define _CRT_SECURE_NO_WARNINGS
Method 3: Setting up the preprocessor
Right click -> Configuration Properties -> Properties -> C/C++ -> Preprocessors -> Preprocessor Definitions -> Enter_CRT_SECURE_NO_WARNINGS
Method 4: Disable security checks
Right click -> Configuration Properties -> Properties -> C/C++ -> Code Generation -> Security Checks -> Disable Security Checks (/GS-)
