using the result of a UILabel after a calculation in another calculation in Xcode
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G'day 

I hope what I'm about makes sense.  what I am trying to do is use the result of say a - b = c. 
now "a" and "b" are both UITextfields and "C" is a UILabel.  

I want to be able to use the result of "c" to take "a" place each time the calculation is run. 

example:  100 - 30 = 70,  then the next time I want to add another figure in position "b", "a" is now result of "c". 

now I also want to keep the original result of "a" in the textfield I entered first so I have it as a reference point. but would like to have the "c" result to drop each time I enter a figure into "b". now how do I code this?

the first part I have but not the second part.

I hope this makes sense.

thanks for your time and look forward to reading some responses.

regards 
bandicoot 
