各位前辈JAVA有JRE,这样可以通过不跨平台的JVM来实现JAVA的跨平台,那么为什么C++就不能有个CVM或着CRE什么的,这样C++不是也可以跨平台了吗?既然现在C++不能跨平台,这说明JAVA和C++还是有本质区别的,请问各位前辈是什么原因使C++不能跨平台?

First.Thank you for your answer,but i still feel a little confused..
why does the c++ not to operate the date type like java?
why does the c++ not to also prescribe the primitive type on a fixed byte in the different OS?