C4996 ‘fopen’: This function or variable may be unsafe. Consider using fopen_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details. fileDemo.c d:\vs2015workspace\filedemo.c\filedemo.c\main.c 14
解决办法：：
项目–>项目属性–>c/c++ –>预处理器定义
添加：_CRT_SECURE_NO_WARNINGS
确定