XCode 下的开发 类的方法扩展 读书日志记录1.
@interface Fraction : NSObject {
int numerator;
int denominator;
}
-(Fraction*) initWithNumerator:(int)n denominator:(int)d;
-(int) numerator;
-(int) denominator;
-(void) print;
-(void) setNumerator:(int)n;
-(void) setDenominator:(int)n;
-(void) setNumeratorAndDenominator:(int) num
andDeno:(int) den;
@end
--------------------
@implementation Fraction
-(int) numerator{
return numerator;
}
-(int) denominator
{
return denominator;
}
-(void) print
{
printf("%i--%i/r", numerator, denominator);
}
-(void) setNumerator:(int)n
{
numerator=n;
}
-(void) setDenominator:(int)n
{
denominator=n;
}
-(void) setNumeratorAndDenominator:(int) num
andDeno:(int) den
{
numerator=num;
denominator=den;
}
-(Fraction*) initWithNumerator:(int)n denominator:(int)d
{
self=[super init];
if(self)
{
[self setNumeratorAndDenominator:n andDeno:d ];
}
return self ;
}
@end
---------------------静态扩展方法--------------
@interface Fraction (Math)
-(Fraction*) add: (Fraction*) f;
-(Fraction*) mul: (Fraction*) f;
-(Fraction*) div: (Fraction*) f;
-(Fraction*) sub: (Fraction*) f;
@end
#import "FractionMath.h"
@implementation Fraction (Math)
-(Fraction*) add: (Fraction*) f {
int num= numerator + [f numerator] ;
int deo= denominator + [ f denominator];
return [[Fraction alloc] initWithNumerator: num denominator: deo];
}
-(Fraction*) sub: (Fraction*) f {
return [[Fraction alloc] initWithNumerator: numerator - [f numerator]
denominator: denominator - [f denominator]];
}
-(Fraction*) mul: (Fraction*) f {
return [[Fraction alloc] initWithNumerator: numerator * [f numerator]
denominator: denominator * [f denominator]];
}
-(Fraction*) div: (Fraction*) f {
return [[Fraction alloc] initWithNumerator: numerator % [f numerator]
denominator: denominator % [f denominator]];
}
@end
--------------------有点类似于C# 里的
pubic static void ExecCmd(this Sqlconnection cnn ,string cmdText)
{
/////////////
}
