No offense, but your friend is a terrible source of information on chickens. Do yourself a favor, the next time they tell you anything about chickens - smile, nod, say 'OK' and ignore anything you just heard.
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Unless your chickens are free ranging in a lush forest/meadow setting with an incredible variety of insects, vegetation and seed, to supplement only cracked corn your birds are STARVING TO DEATH.
First of all, cracked corn - any grain that has had the hull broken loses nutrition rapidly.
Corn can be 2.5%-9% protein. Furthermore the proteins are incomplete and deficient in lysine and tryptophan. Lysine is essential for chickens.
Chickens need at least 15% protein. I feed between 16% and 24% depending on what they are for(meat or eggs) and how fast and big I want them to get.
Corn has virtually no calcium. Layers need MUCH more.
You can mix your own feed which requires a tremendous variety of foodstuffs including something like fishmeal for protein OR use a grower ration for young birds and layer ration for layers.
The suggestion of layer mash in the spring summer and fall isn't too bad unless all your birds aren't layers.
Layer feed is only for layers. The high calcium is bad for younger birds.
To feed only cracked corn to chickens is like you living entirely on ice cream. How long do you think you would live?
I don't want to offend but please educate yourself in poultry nutrition unless you want to see your birds slowly emaciate.
To get you started, here's some reading material for you.
http://www.lionsgrip.com/feedinstruc.html
http://animalscience.ucdavis.edu/avian/feedingchickens.pdf
http://www.lionsgrip.com/protein.html
Friends aren't necessarily the best sources of information, they are only friends.
A friend of mine, who raised chickens a long time, told me this week that she loved brown eggs because the yolks were such a rich orange and white eggs had pale yellow yolks. Not being one to let misinformation fester, I had to let her know dark yolks were from free ranging on pasture, not the color of the shell. Probably the reason she thought that is her experience with factory battery hen white eggs from the grocery store and her free range brown layers.
See how anecdotal evidence can have unintended affects