"Please be sure to set the executable bit." should be more like "Please be sure to set the executable bit. In terminal, make sure you're in the directory that contains main and enter: chmod +x main "
This is important because most people with little experience working in terminal will create the file called main using the file browser and a application of some sort (i.e., open text edit and save as "main"). Especially since your only instructions for creating the main file are, "Now, create a file called main.".
"Please be sure to set the executable bit." should be more like "Please be sure to set the executable bit. In terminal, make sure you're in the directory that contains main and enter: chmod +x main "
This is important because most people with little experience working in terminal will create the file called main using the file browser and a application of some sort (i.e., open text edit and save as "main"). Especially since your only instructions for creating the main file are, "Now, create a file called main.".