With Dev-C++ I'm assuming you're using Windows. You should know where your executable is because it is where you created your project. First, go to the windows explorer and navigate to the directory where your project is, and look for an exe file. If you don't see it, look in the Debug directory. When you find it, double-click on it. This should show your output and wait for you to hit enter twice before closing. If you cannot find it, look harder, or check Dev-C++ to see if there were any compile errors.