Program received signal: "EXC_BAD_ACCESS"

Initializing it fixed the 0x0 thing, but I still can't solve the main issue when this method is called. The error received is the title of the discussion.

- (IBAction)evaluatePressed

{

[displaysetText:[NSStringstringWithFormat: @"%d", [CalculatorBrainevaluateExpression:[[selfbrain].expressioncopy]

usingVariableValues:[[NSDictionary alloc] initWithObjectsAndKeys:@"x", 2, @"a", 4, @"b", 8, nil]] ]];

}

Any help is appreciated. Thanks in advance.

Much thanks guys for your help 🙂

I'm stuck at another problem though.

NSMutableArray *evaluatingExpression = [anExpression copy];

if ( ! [[evaluatingExpression lastObject] isEqual:@"="] ) {

[evaluatingExpression addObject:@"="];

}

It crashes at [evaluatingExpression addObject:@"="]; saying "Program received signal: SIGART".

If this case is wrong, it crashes at another point.

for (NSString *variableObject in variables) {

if ([variableObject isEqualToString:character]) {

[workerBee setOperand: [[variables objectForKey:variableObject] doubleValue]];

break;

}

}

It crashes at if ([variableObject isEqualToString:character]) saying the same message.

Debug logs statement I noticed:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFNumber isEqualToString:]: unrecognized selector sent to instance 0x540cc00'

How NSDictionary is declared:

- (IBAction)evaluatePressed

{

[displaysetText:[NSStringstringWithFormat: @"%g", [CalculatorBrainevaluateExpression:[[selfbrain].expressioncopy]

usingVariableValues:[[NSDictionary alloc]

initWithObjectsAndKeys:

@"x", [NSNumber numberWithDouble:2],

@"a", [NSNumber numberWithDouble:4],

@"b", [NSNumber numberWithDouble:8], nil]] ]];

}

I'm pulling out my hair because of those errors..

Any help is appreciated, and thanks for those who helped me at the first error again.

But I'm not comparing an NSNumber here. Isn't variable object supposed to be a string? @"x" or @"a" or @"b" ?

character is an NSString by the way.

Yes I know about the id thing, but I still don't know how to enumerate through these objects.

I asked a professional friend who recommended sending all keys to the dictionary and enumerating through them, then sending objectForKey to the dictionary to get the object.

I know that this will mostly work, but why doesn't what I wrote work?

Just noticed that I flipped the order of keys and objects. I flipped them and everything worked fine.

if ( ! [[evaluatingExpression lastObject] isEqual:@"="] ) {

[evaluatingExpression addObject:@"="];

}

doesn't work though 😟

2012-06-24 05:14:57.754 Calculator[1602:207] -[__NSArrayI addObject:]: unrecognized selector sent to instance 0x54017d0

2012-06-24 05:14:57.899 Calculator[1602:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayI addObject:]: unrecognized selector sent to instance 0x54017d0'

evaluatingExpression is a copy of expression sent to the evaluateExpression method as an argument/parameter

Shall I use [NSString stringWithString:@"="] instead?

I can do it in an alter way getting out of adding an object way, but the main goal of solving these stuff is to know how to pass those code errors, so I need to know why it happens so if it happened one day where I must use it, I can solve it :|

Thanks again etresoft for your help 🙂

EDIT: Just tried [evaluatingExpression addObject:[NSString stringWithString:@"="] instead. Didn't work. Still the same error. I knew that there's something wrong with the method itself or evaluatingExpression object, but I just tried...

Message was edited by: TheNavigator - Added the Edit

+ (double)evaluateExpression:(id)anExpression

usingVariableValues:(NSDictionary *)variables

{

NSMutableArray *evaluatingExpression = [anExpression copy];

if ( ! [[evaluatingExpression lastObject] isEqual:@"="] ) {

[evaluatingExpression addObject:[NSString stringWithString:@"="] ];

}

Well, I tried using anExpression directly but I failed. I'll try that mutableCopy thing though.

Thank you very much. This solved it.