Windows 环境变量 temp和tmp 改变 导致 VC 编译出错：
fatal error C1083: Cannot open compiler intermediate file: 'C:/DOCUME~1/
username/LOCALS~1/Temp/'
Permission denied Error executing cl.exe.解决：偶比较笨把 windows 环境变量temp和tmp
改回了原来值 “
%USERPROFILE%/Local Settings/Temp
”（没有引号）才使VC恢复正常error 02065:'malloc/exit' undeclared identifier
解决：都在stdlib.h中
