C++ – Eclipse CDT : running C++ program not showing anything in the console! Why

//have you put endl at the end of your output?

int main()
{
    cout << "!!!Hello World!!!"; // prints nothing to console ; no endl
    cout << "!!!Hello World!!!" << endl; // prints !!!Hello World!!! twice
    return 0;
}

This worked for me on 64-bit install of Eclipse on Windows 7 using MinGW:

Right-click on your project. Select "Properties".

Select the "Run/Debug Settings" Property on the left of the new window.

In the right window, click on your executable to highlight (ie - Test.exe) and click "Edit".

In the Environment tab, hit "New"

Name: PATH
Value: Path to your MinGW bin directory. (For me this was: C:\devcore\MinGW\bin)

Click "OK" on all windows to close down.

Try running again, it should print output to the screen.