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)