線程錯誤 - 線程1：Breakpoint1.1

Question

我附上以下程序代碼以顯示分數的實際值，並且構建成功，但程序崩潰且線程錯誤。你能告訴我，Iam在哪裏犯了一個錯誤。真的很感謝幫助。
感謝
Maverick10

#import<Foundation/Foundation.h> 

@interface Fraction : NSObject 
{ 
    int numerator; 
    int denominator; // variables to be used 
} 
-(void) print; 
-(void) setNumerator:(int) n; 
-(void) setDenominator:(int) d; 
-(int) numerator; 
-(int) denominator; 
-(double) convertToNum; // new method declared 
@end 

@implementation Fraction 
-(void) print 
{ 
NSLog(@"%i/%i",numerator,denominator); 
} 
-(void) setNumerator :(int) n 
{ 
numerator=n; 
} 
-(void) setDenominator :(int)d 
{ 
denominator=d; 
} 
-(int)numerator 
{ 
return numerator; 
} 
-(int) denominator 
{ 
return denominator; 
} 
-(double) convertToNum 
{ 
if(denominator!=0) // checking for denominator to be non zero 
return (double) numerator/denominator; 
else 
return NAN; 
} 
@end 
//Program Section 
int main(int argc, char*argv[]) 
{ 
    NSAutoreleasePool * pool = [[ NSAutoreleasePool alloc] init]; 

    Fraction * aFraction =[[Fraction alloc] init]; 
    Fraction * bFraction =[[Fraction alloc] init]; 

    [aFraction setNumerator:1]; // setting the numerator for the first fraction.Similarly denominator 
    [aFraction setDenominator:4]; 
    [aFraction print]; 
    NSLog(@"= "); 
    NSLog(@"%g",[aFraction convertToNum]); 

    [bFraction print]; 
      NSLog(@"="); 
    NSLog(@"%g",[bFraction convertToNum]); 

    [aFraction release]; 
    [bFraction release]; 

    [pool drain]; 
    return 0; 
} 

Answer 1

你得到線程1：Breakpoint1.1因爲你增加了一個斷點 - （無效）setNumerator。您可能只是不小心點擊了該空間來添加斷點。