eclipse : Program "g++" not found in PATH

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Ubuntu

Eclipse

I've already install the gcc, g++ compiler, and jdk, but I just write a simple test, eclipse find problems, but it can run through it detect problems

1

#include <iostream>

using namespace std;

int main() {
    cout << endl;
    cout << endl;
    cout << "kill them all." << endl;

    return 0;
}



in the ecplise problem tab, it says :
Program "g++" not found in PATH
Symbol 'cout' could not be resolved kill.cpp    /an line 12 Semantic
Symbol 'cout' could not be resolved kill.cpp    /an line 14 Semantic
Symbol 'cout' could not be resolved kill.cpp    /an line 13 Semantic



here's my compiler:
root@yuan:/usr/bin# ls -l gcc* g++* cpp*
lrwxrwxrwx 1 root root 7 Oct 28 14:25 cpp -> cpp-4.7
-rwxr-xr-x 1 root root 531692 Sep 22 01:35 cpp-4.7
lrwxrwxrwx 1 root root 7 Oct 29 13:19 g++ -> g++-4.7
-rwxr-xr-x 1 root root 531692 Sep 22 01:37 g++-4.7
lrwxrwxrwx 1 root root 7 Oct 28 14:25 gcc -> gcc-4.7
-rwxr-xr-x 1 root root 527596 Sep 22 01:39 gcc-4.7
-rwxr-xr-x 1 root root 21996 Sep 22 01:39 gcc-ar-4.7
-rwxr-xr-x 1 root root 21996 Sep 22 01:39 gcc-nm-4.7
-rwxr-xr-x 1 root root 21996 Sep 22 01:39 gcc-ranlib-4.7</pre>