My challenge solution


#1

Just thought I’d share my code with you guys, think it’s a pretty standard solution.

[code]// BNRStockHolding.h

#import <Foundation/Foundation.h>

@interface BNRStockHolding : NSObject
{
float _purchaseSharePrice;
float _currentSharePrice;
int _numberOfShares;
}

// accessor methods

  • (float)purchaseSharePrice;
  • (float)currentSharePrice;
  • (int)numberOfShares;

// setter methods

  • (void)setCostInDollars:(float)c;
  • (void)setValueInDollars:(float)v;
  • (void)setNumberOfShares:(float)s;

// getter methods

  • (float)costInDollars; // purchaseSharePrice * numberOfShares
  • (float)valueInDollars; // currentsharePrice * numberOfShares

// custom description method

  • (void) getDescription:(BNRStockHolding *)s;

@end[/code]

[code]// BNRStockHolding.m

#import “BNRStockHolding.h”

@implementation BNRStockHolding

  • (float)purchaseSharePrice {
    return _purchaseSharePrice;
    }

  • (float)currentSharePrice {
    return _currentSharePrice;
    }

  • (int)numberOfShares {
    return _numberOfShares;
    }

  • (void)setCostInDollars:(float)c {
    _purchaseSharePrice = c;
    }

  • (void)setValueInDollars:(float)v {
    _currentSharePrice = v;
    }

  • (void)setNumberOfShares:(float)s {
    _numberOfShares = s;
    }

  • (float)costInDollars {
    float pSP = [self purchaseSharePrice];
    float nOS = [self numberOfShares];
    return pSP * nOS;
    }

  • (float)valueInDollars {
    float cSP = [self currentSharePrice];
    float nOS = [self numberOfShares];
    return cSP * nOS;
    }

  • (void)getDescription:(BNRStockHolding *)s {
    NSLog(@"\nCost in Dollars: %.2f\nValue in Dollars: %.2f\n", [self costInDollars], [self valueInDollars]);
    }

@end[/code]

[code]// main.m

#import <Foundation/Foundation.h>
#import “BNRStockHolding.h”

int main(int argc, const char * argv[]) {
@autoreleasepool {
// create an array to hold values
NSMutableArray *stockArray = [[NSMutableArray alloc]init];

    // create an instance of BNRStockHolding
    BNRStockHolding *stockOne = [[BNRStockHolding alloc]init];
    // give the ivars values using setter methods
    [stockOne setCostInDollars:2.30];
    [stockOne setValueInDollars:4.50];
    [stockOne setNumberOfShares:40];
    // add 1st object to array
    [stockArray addObject];
    
    BNRStockHolding *stockTwo = [[BNRStockHolding alloc]init];
    [stockTwo setCostInDollars:12.19];
    [stockTwo setValueInDollars:10.56];
    [stockTwo setNumberOfShares:90];
    // add 2nd object
    [stockArray addObject];
    
    BNRStockHolding *stockThree = [[BNRStockHolding alloc]init];
    [stockThree setCostInDollars:45.10];
    [stockThree setValueInDollars:49.51];
    [stockThree setNumberOfShares:210];
    // add 3rd object
    [stockArray addObject:stockThree];
    
    // iterate objects in array
    for (BNRStockHolding *s in stockArray) {
        [s getDescription:s];
    }
}
return 0;

}[/code]

And the output is:

2015-02-09 10:47:38.508 Stocks[1001:367576] Cost in Dollars: 92.00 Value in Dollars: 180.00 2015-02-09 10:47:38.510 Stocks[1001:367576] Cost in Dollars: 1097.10 Value in Dollars: 950.40 2015-02-09 10:47:38.510 Stocks[1001:367576] Cost in Dollars: 9471.00 Value in Dollars: 10397.10 Program ended with exit code: 0

Let me know what you think? :smiley:


#2

Good, but…

[quote][code]

// custom description method

  • (void)getDescription:(BNRStockHolding *)s;

  • (void)getDescription:(BNRStockHolding *)s {
    NSLog(@"\nCost in Dollars: %.2f\nValue in Dollars: %.2f\n", [self costInDollars], [self valueInDollars]);
    }
    [/code][/quote]
    Since the argument is not being used, better to simplify the method as:

...
// custom description method
- (void)printDescription;
...
- (void)printDescription {
    NSLog (@"\nCost in Dollars: %.2f\nValue in Dollars: %.2f\n", [self costInDollars], [self valueInDollars]);
}