Why Eclipse Doesn't run this code ?

Question

Why Eclipse Doesn't run this code ?

Every time I try to run any C++ code on Eclipse C/C++ compiler it doesn't recognize these lines:

#include <iostream>
using namespace std;

the #include comes up with "unresolved inclusion"
the second one comes up with "symbol std couldn't be resolved"

Does anyone knows what this is about ?

Answer 1

Go to Project / properties / c/c++ general / preprocessor includes / providers and select "CDT GCC Built -in Compiler Settings".