ios - Subtracting Currency - NSNumber -


im dealing currency values need subtract each other. read nsnumber dealing currency, unable subtract 2 nsnumbers. there better way dealing currencys or missing small?

 nsnumberformatter *numberformatter = [[nsnumberformatter alloc] init];         [numberformatter setnumberstyle: nsnumberformattercurrencystyle];         nsnumber* number = [numberformatter  numberfromstring:bdict[@"booking_deposit"]];         if (!number) {             [numberformatter setnumberstyle: nsnumberformatterdecimalstyle];             number = [numberformatter  numberfromstring:bdict[@"booking_deposit"]];         }         nsnumber* number2 = [numberformatter  numberfromstring:bdict[@"booking_total"]];         if (!number2) {             [numberformatter setnumberstyle: nsnumberformatterdecimalstyle];             number2 = [numberformatter  numberfromstring:bdict[@"booking_total"]];         }         nslog(@"result %@",number2 - number);//warning here

and heres warning:

arithmetic on pointer interface 'nsnumber', not constant size architecture , platform

you can't subtract objects, that's why error.

you use nsdecimalnumber instead of nsnumber , have api decimalnumberbysubtracting:.

alternatively, use double.

the main point use data type allows level of precision you're interested in, , relates number of , type of calculations you're going make.

nsnumberformatter offer generatesdecimalnumbers (it used have bug, not sure if still does, worth investigation).


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