'scanf': This function or variable may be unsafe

'scanf': This function or variable may be unsafe. Consider using scanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

VS认为 scanf(); 不安全。

解决方法1：

scanf_s();	//用scanf_s();替换

解决方法2：添加预编译

#define _CRT_SECURE_NO_WARNINGS

解决方法3：

#param warning(disable:4996)