1）注释快捷键：

CTRL + K - CTRL + C (注释)

CTRL + K 然后 CTRL + U (取消注释)

shift+“*”---------整段（取消）注释

2）错误 C4996
                 'strcpy': This function or variable may be unsafe.

Consider using strcpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS.

See online help for details.

解决方法： 新加一行#pragma warning(disable:4996)