Amazon.com Widgets Chapter 7 exercise 2
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+ Official Forum for Programming in Objective-C (the iPhone Programming Language) - Stephen Kochan
|-+ Programming in Objective-C, 4th edition
| |-+ Exercises
| | |-+ Chapter 7
| | | |-+ Chapter 7 exercise 2
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Author Topic: Chapter 7 exercise 2 (Read 664 times)
elkie13
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Posts: 17






on: February 22, 2012, 04:29:26 PM

Here's what I think you were after in Ex 2.  You wanted us to be able to tell the print method if the number needed reducing?  So I added the BOOL argument to the print method.  Then I removed the reduce line from the add method.  In the main I added the two fractions and called print method first with requesting reduction then without to prove I did not permanently change the result.
------------in fraction.m---------------------
-(void) print:(BOOL)r;
{
    Fraction *display = [[Fraction alloc]init];
    [display setTo:numerator over:denominator];
    if (r)
        [display reduce];
   
    NSLog(@"%i/%i",display.numerator,display.denominator);
}
-(Fraction *) add:(Fraction *)f
{
    Fraction *result = [[Fraction alloc]init];
   
    result.numerator = numerator * f.denominator + denominator * f.numerator;
    result.denominator = denominator * f.denominator;
   
    return result;
}
--------------------in main.m
int main (int argc, const char * argv[])
{

    @autoreleasepool {
        Fraction *aFraction =[[Fraction alloc]init];
        Fraction *bFraction =[[Fraction alloc]init];   
        Fraction *resultFraction;
     
       
        [aFraction setTo:1 over:2];
        [bFraction setTo:1 over:4];
               
        resultFraction = [aFraction add:bFraction];
     
       
        [resultFraction print:YES];
     
        [resultFraction print:NO];
       
   
       
    }
    return 0;
}
---------------------------output---------------
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