objective-c - 线程错误 - 线程 1：Breakpoint1.1

Question

我附上了以下程序代码，用于显示分数的实际值，构建成功，但程序因线程错误而崩溃。你能告诉我，我在哪里犯了错误。非常感谢您的帮助。
谢谢
小牛10

#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 Thread1:Breakpoint1.1 因为你在 -(void)setNumerator 添加了一个断点。您可能只是不小心单击了该空间以添加断点。