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News: Read this please.The Great Kangaroo Escape Looking for reviews of the 4th ed on Amazon!   Twitter:  @skochan

+ Official Forum for Programming in Objective-C (the iPhone Programming Language) - Stephen Kochan
|-+ Old Stuff
| |-+ Answers to Exercises
| | |-+ Chapter 9
| | | |-+ Exercise 6
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Author Topic: Exercise 6 (Read 1589 times)
Jr. Member
Posts: 89

on: February 18, 2009, 11:59:06 AM

Is this right?

#import "Calculator.h"

int main (int argc, char *argv[])
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
   Calculator *deskCalc;
   deskCalc = [[Calculator alloc] init];
   [deskCalc clear];
   [deskCalc setAccumulator:100.0];
   [deskCalc add: 200];
   @try {
      [deskCalc divide:15.0];
   @catch (NSException *e) {
      NSLog(@"Caught %@", [e name]);
   [deskCalc subtract:10.0];
   [deskCalc multiply:5];
   NSLog (@"The result is %g", [deskCalc accumulator]);
   [deskCalc release];
   [pool drain];
   return 0;

Posts: 8

Reply #1 on: May 04, 2009, 06:38:08 PM

Any idea why the errata says to delete this exercise (from the 1st printing, which I have)?

Hero Member
Posts: 3114

Reply #2 on: May 04, 2009, 06:48:05 PM

Division by zero will abort the program's execution but does not throw an exception.  In order to solve this problem, you need to test for division by zero in the code and then throw an exception yourself.  There's not enough details given in text on exception processing to show how to do that.   (next edition.  Grin )


Steve Kochan
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