定義⼀個分數類（fraction）
例項變數：分子，分母
⽅法：初始化⽅方法（2個引數），便利構造器，約分，列印，加，減，乘，除。
main.m
#import
#import "fraction.h"
int main(int argc, const char * argv)
fraction.h
#import
@inte***ce fraction : nsobject
//自定義初始化方法
- (id)initwithnumerator:(nsinteger)anumerator;
- (id)initwithnumerator:(nsinteger)anumerator denominator:(nsinteger)adenominator;
//便利構造器
+ (fraction *)fractionwithnumerator:(nsinteger)anumerator denominator:(nsinteger)adenominator;
//setter和getter
- (void)setnumerator:(nsinteger)anumerator;
- (nsinteger)numerator;
- (void)setdenominator:(nsinteger)adenominator;
- (nsinteger)denominator;
//最大公約數:輾轉相除法
- (nsinteger)greatestcommondivisorwit
honenumber:(nsinteger)onenumber anothernumber:(nsinteger)anothernumber;
//約分
- (void)reductionoffraction;
//列印
- (void)print;
//加+ (fraction *)addwitfafraction:(fraction *)afraction bfraction:(fraction *)bfraction;
//減+ (fraction *)minuswitfafraction:(fraction *)afraction bfraction:(fraction *)bfraction;
//乘+ (fraction *)timewitfafraction:(fraction *)afraction bfraction:(fraction *)bfraction;
//除+ (fraction *)dividewitfafraction:(fraction *)afraction bfraction:(fraction *)bfraction;
@end
fraction.m
#import "fraction.h"
@implementation fraction
- (id)init
return self;
}- (id)initwithnumerator:(nsinteger)anumerator
- (id)initwithnumerator:(nsinteger)anumerator denominator:(nsinteger)adenominator
+ (fraction *)fractionwithnumerator:(nsinteger)anumerator denominator:(nsinteger)adenominator
- (void)setnumerator:(nsinteger)anumerator
- (nsinteger)numerator
- (void)setdenominator:(nsinteger)adenominator
- (nsinteger)denominator
//最大公約數:輾轉相除法
- (nsinteger)greatestcommondivisorwithonenumber:(nsinteger)onenumber anothernumber:(nsinteger)anothernumber
return onenumber;
}//約分
- (void)reductionoffraction
//列印
- (void)print
//加+ (fraction *)addwitfafraction:(fraction *)afraction bfraction:(fraction *)bfraction
//減+ (fraction *)minuswitfafraction:(fraction *)afraction bfraction:(fraction *)bfraction
//乘+ (fraction *)timewitfafraction:(fraction *)afraction bfraction:(fraction *)bfraction
//除+ (fraction *)dividewitfafraction:(fraction *)afraction bfraction:(fraction *)bfraction
@end
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