ios - Declaring a number (runningScore) that can be subtracted from and new number retained in objective c -

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i looking set calculator of sorts whereby there targetscore , when click on button subtracts given number targetscore , result becomes new targetscore , process continues until targetscore 0.

i have read steven kochans book, , several objective c dummies (quite appropriate me), have looked @ tutorials on lynda.com , read million threads on here have yet find suitable answer (or @ least 1 have recognised suitable). new objective c , more prepared hard yards , research if can point me in right direction.

i not asking write code me point me in right direction, i.e. declare targetscore nsobject/nsnumber/nsdecimalnumber/nsmutablearray etc , how new targetscore retained , replace old targetscore.

i thank in advance proffered,

baby steps. smallest possible data format satisfy needs. in case - you'd short char (for score -128 127) or unsigned short unsigned char (for score 0 255). if not, int or nsinteger cover bases (unless score higher 2^31). it's simple integer , don't need objects (like nsnumber or nsdecimalnumber) simple math going do.


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