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POObjective-C: Receive "EXC_BAD_ACCESS" signal
 

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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/7710903/exc-bad-access-when-trying-to-get-iphone-screen-dimensions">EXC_BAD_ACCESS when trying to get iPhone screen dimensions</a> </p> </blockquote> <p>I have the following code snippet in objective-c that automatically sets some variables to a number of presets. However, on the marked line I get a "Program received signal: EXC_BAD_ACCESS" exception.</p> <p>What confuses me is that the line above is identical, just with a different value. If line 1 does not throw an exception, why should line 2? What can I do about this?</p> <p>Thanks in advance!</p> <p>Sterren</p> <pre><code>- (IBAction)presetPressed:(id)sender { if(self.userEnteringNumber) [self enterPressed]; double xVal; double aVal; double bVal; NSString *preset = [sender currentTitle]; if ([preset isEqualToString:@"1"]) { xVal = 1; aVal = 2; bVal = 3; } else if ([preset isEqualToString:@"2"]) { xVal = 1.5; aVal = 2.9; bVal = 3.0; } else if ([preset isEqualToString:@"3"]) { xVal = -1; aVal = -2; bVal = -3; } [self.variables setValue:[NSNumber numberWithDouble:xVal] forKey:@"x"]; [self.variables setValue:[NSNumber numberWithDouble:aVal] forKey:@"a"]; [self.variables setValue:[NSNumber numberWithDouble:bVal] forKey:@"b"]; self.xVar.text = [NSString stringWithFormat:@"= %@", xVal]; self.aVar.text = [NSString stringWithFormat:@"= %@", aVal]; //EXC_BAD_ACCESS here self.bVar.text = [NSString stringWithFormat:@"= %@", bVal]; [self calculateResult]; } </code></pre>
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    1. COThank you, this solves my problem. Part of the question is related to why this works for the first statement but not the second. Also, all 3 statements happen to work when preset == "1". If %@ is only supposed to work for objects and not primitives, why does it sometimes work and sometimes not?
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    2. COThank you respondents! Your help is greatly appreciated. Both your solutions, T Reddy and Till, are excellent. However, armed with the information that %@ is for objects, I decided for the following solution; self.xVar.text = [NSString stringWithFormat:@"= %@", [NSNumber numberWithDouble:xVal]]; This ensures that the text in xVar is formatted nicely without unnecessary trailing zeros.
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