Ios development-calculator improvement, ios development Calculator

Ios development-calculator improvement, ios development Calculator

#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 = '\0';        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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