Resolves an issue where C + + code in eclipse shows the symbol ' STD ' could not being resolved

The first time I wrote C + + code in Eclipse, wrote a simple Hello World program, and did not wait for me to compile, I reported a variety of errors, but so simple code, how can so many errors, so ignore, compile and run, can output normal!!! Hello World!!!, but there are still a lot of red forks in my code, put the mouse on the above display: Symbol ' std ' could not being resolved such information.

So the question came, how to solve it?

Method: After writing the library function immediately save, so that the code after writing will not be an error

For example:--> first write # include <iostream>

-Save

-and then write the following code (as long as it is correct, no error)

Resolves an issue where C + + code in eclipse shows the symbol ' STD ' could not being resolved