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POCompilation Errors in running objective c code in ubuntu 12.10
 

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  1. POCompilation Errors in running objective c code in ubuntu 12.10
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    <p>I'm trying to run the following code: </p> <pre><code>#import &lt;stdio.h&gt; #import &lt;Foundation/NSObject.h&gt; //--------@interface section-------- @interface Fraction: NSObject { int numerator; int denominator; } -(void) setNumerator: (int) n; -(void) setDenominator: (int) d; -(void) print; @end //-------@implementation section------- @implementation Fraction; //getters -(int) numerator { return numerator; } -(int) denominator { return denominator; } //setters -(void) setNumerator: (int) num { numerator = num; } -(void) setDenominator: (int) denom { denominator = denom; } //other -(void) print { printf("The value of the fraction is %i/%i\n", numerator, denominator); } @end //---------program section--------- int main(void) { Fraction *myFract; myFract = [Fraction new]; [myFract setNumerator: 1]; [myFract setDenominator: 3]; printf("The numerator is %i, and the denominator is %i\n", [myFract numerator], [myFract denominator]); [myFract print]; [myFract free]; return 0; } </code></pre> <p>when I compile it</p> <pre><code>$gcc -framework Foundation p10.m </code></pre> <p>I got ff. errors:</p> <pre><code>Program19_2.m: In function ‘main’: Program19_2.m:55:2: warning: ‘Fraction’ may not respond to ‘+new’ [enabled by default] Program19_2.m:55:2: warning: (Messages without a matching method signature [enabled by default] Program19_2.m:55:2: warning: will be assumed to return ‘id’ and accept [enabled by default] Program19_2.m:55:2: warning: ‘...’ as arguments.) [enabled by default] Program19_2.m:64:2: warning: ‘Fraction’ may not respond to ‘-free’ [enabled by default] /tmp/ccVRbEBu.o: In function `main': Program19_2.m:(.text+0x6d): undefined reference to `objc_get_class' Program19_2.m:(.text+0x7f): undefined reference to `objc_msg_lookup' Program19_2.m:(.text+0xa4): undefined reference to `objc_msg_lookup' Program19_2.m:(.text+0xcd): undefined reference to `objc_msg_lookup' Program19_2.m:(.text+0xf6): undefined reference to `objc_msg_lookup' Program19_2.m:(.text+0x119): undefined reference to `objc_msg_lookup' /tmp/ccVRbEBu.o:Program19_2.m:(.text+0x14e): more undefined references to `objc_msg_lookup' follow /tmp/ccVRbEBu.o: In function `__objc_gnu_init': Program19_2.m:(.text+0x19a): undefined reference to `__objc_exec_class' /tmp/ccVRbEBu.o:(.data+0x148): undefined reference to `__objc_class_name_Object' collect2: error: ld returned 1 exit status </code></pre> <p>I just copied the code from a textbook. Change the libraries I import because they are (Object.h) now deprecated. I wonder why it doesn't run. Is there something wrong with the way I compile the program?</p>
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    1. USRalf Rafael Frix
    1. USRalf Rafael Frix
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    1. COYou mean *Compilation Error* right? Your title suggests the language is broken, when the error is, in fact, wholly yours.
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      1. UStrojanfoe
    2. COwhat is the `Object` exactly where you inherited your class from? is it an kind of `NSObject`? the `NSObject` _has_ the `+new` method, but we don't know anything about the `Object`, I think.
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      1. USholex
    3. COso how do I compile this thing? is gcc p10.m enough? My first assumption is that the book might just a topographical error.
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      1. USRalf Rafael Frix
 

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