iOS Development-Calculator improvements

#import <foundation/foundation.h>extern double Add (double x,double y), extern double subtract (double x,double y); extern double multiply (double x,double y), extern double divide (double x,double y);

#import <Foundation/Foundation.h> #import "MathOperation.h" BOOL isanoperator (const char value) {return (value = = '+')|| (Value = = '-') | | (Value = = ' * ') | | (Value = = '/'));}    int main (int argc,const char * argv[]) {double result = 0;        Char operator = ' + ';        NSString * equation = [NSString stringwithutf8string:argv[0]];        Nsarray *eqparts = [equation Componentsseparatedbycharactersinset:[nscharacterset whitespaceCharacterSet];        for (int n = 0; n < [eqparts count]; n++) {NSString * argstring = [Eqparts objectatindex:n];                char firstchar = [argstring characteratindex:0];            if (Isanoperator (Firstchar)) {operator = Firstchar;        Continue                } Double newvalue = [argstring doublevalue];                Switch (operator) {case ' + ': result = Add (result, newvalue);            Break        Case '-': result = Subtract (result,newvalue);        Break                Case ' * ': result = multiply (result,newvalue);            Break            Case '/': result = divide (result,newvalue);        Default:break;    }} NSLog (@ "%.3f", result); }//@implementation calculator////@end

#include "MathOperation.h" double Add (double x,double y) {    return x + y;} Double subtract (double x,double y) {    return x-y;} Double multiply (double x,double y) {    return  x * y;} Double divide (double x,double y) {    return x/y;}

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iOS Development-Calculator improvements