Suppose 'corn' needs to be defined Woodruffsdad. Mixed corn, or mixed cereal grains, contains wheat mainly which is low protein slow release carbohydrate best given as a late treat in Winter, when they are not laying so don't need protein so much but need energy during the long cold nights. Maize, or sweetcorn, contains a lot of fat and should be limited, or cut out completely, in Summer as fat birds don't lay. Layers pellets, if they are of good quality, will contain everything they really need, but the addition of fresh veg or fruit gives extra vitamins and acts as a healthy treat. Dinosaw is absolutely correct. They will also dig the corn out and you will waste a lot of feed if put in one feeder -a discovery I made with a bad throw of mixed corn into the run.
Having said that I give a very light ground scattering of mixed corn late on anyway, just to give them a treat. Bit of a softy me, but I like to see them happy. All the cockerels make foody noises and the hens run to them which reinforces their leading role. In Winter it is a heavy scattering.