android - Operation of Subtraction and write the result in the shared preferences -

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I have priority with the value of 20 in string (A), I have to subtract the value of an int (b) 0 From 20, I tried to do this 

  string A = prefs .getString (A, "20"); Int B = intent.getIntExtra (trn + ".INB", 0); TextView TVRest = (TextView) Find ViewById (R.id.txtrest); TvRest.setText (A - (B));

I need to display AB results in TextView txtrest , as I have done.

After you get results, instead of the initial value of C, you can write C in the preferences in C.

Do something like below, 

  int A = integer Parasont (prefs.getString (A, "20")); Int B = intent.getIntExtra (trn + ".INB", 0); Int C = A-B; TextView TVRest = (TextView) Find ViewById (R.id.txtrest); TvRest.setText (String.valueOf (C));

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