What are you asking this question? Do you have a sole proprietorship or single member LLC that owns or has an ownership interest in an S-Corp?
Under no circumstances and with no exceptions will an S-Corp ever file a SCH C. The SCH C is for a sole proprietorship or single member LLC, which are considered disregarded entities by the IRS.
A S-Corp is considered to be a non-living, non-breathing separately taxable entity that must file it's own physically separate 1120-S Corporate tax return.
Did you register your business as an S-Corp? (No - you file SCH C. Yes - you file 1120-S)
Did you register your business as an LLC and then file IRS Form 2553 with the IRS so they will treat your LLC "like an S-Corp" for tax purposes only? (No - you file SCH C. Yes - you file 1120-S)
