Open Simple IDE - It is in Simple View

Open Variables and Calculations.c

Save as Variables and Calculations Test.side

Change content and cntrl+s

Close.

Reopen - into last saved file - in this case, Variables and Calculations Test.side

Open Variables and Calculations.c = okay.

Change content then Save Project As - Variables and Calculations Test two.side

It asks Save File? Variables and Calculations.c with options Save and Discard

So I press save.

Close.

Reopen - into last saved file - in this case Variables and Calculations Test2.side

When I open Variables and Calculations.c it = what was written in Variables and Calculations Test2.side.

(Note, when you say discard, it will leave the old *.c file alone and make a new *.c file with whatever project name you make)
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Another thing.  When you run with terminal, it automatically saves it.