1 //XYPoint类print方法 2  3  4 - (void) print 5 { 6     NSLog(@" (%g , %g) ", x, y); 7 } 8  9 10 //main函数部分11 12         id dataValue;13         14         XYPoint *x1 = [[XYPoint alloc] init];15         16         [x1 setX:12.01 andY:13];17         dataValue =http://www.mamicode.com/ x1;18         [dataValue print];

  1 #import <Foundation/Foundation.h>  2   3 @interface Fraction : NSObject  4 @property int numerator, denominator;  5   6 - (void) print;  7 //- (void) print: (BOOL) isReduce;  8 - (void) setTo: (int) n  over: (int) d;  9 //- (Fraction *) add: (Fraction *) f; 10 - (id) addFrac: (id) f; 11 //- (Fraction *) subtract: (Fraction *) f; 12 //- (Fraction *) multiply: (Fraction *) f; 13 //- (Fraction *) divide: (Fraction *) f; 14 - (void) reduce;                  //约简 15 - ( double) convertToNum;  //转换为双精度值 16  17 @end 18  19  20 #import "Fraction.h" 21  22 @implementation Fraction 23 @synthesize numerator, denominator; 24  25 //@synthesize numerator,denominator; 26  27 - (void) print 28 { 29     NSLog(@"%d / %d", numerator, denominator); 30 } 31  32 //- (void) print: (BOOL) isReduce  //BOOL参数 是否约简 33 //{ 34 //    if (numerator % denominator == 0) { 35 //        NSLog(@"%d",numerator/denominator); 36 //    }else if (numerator > denominator){ 37 //        [self reduce]; 38 //        NSLog(@"%d %d/%d",numerator/denominator,numerator % denominator,denominator); 39 //    }else if (isReduce) { 40 //        [self reduce]; 41 //        NSLog(@"%d/%d",numerator,denominator); 42 //    }else 43 //        NSLog(@"%d/%d",numerator,denominator); 44 // 45 //} 46  47 - (void) setTo: (int) n  over: (int) d 48 { 49     numerator = n; 50     denominator = d; 51 } 52  53 - (id) addFrac: (id) f 54 { 55     Fraction *result = [[Fraction alloc] init]; 56      57     result.numerator = numerator * [f denominator] + denominator * [f numerator]; 58     result.denominator = denominator * [f denominator]; 59      60     return result; 61 } 62  63 //- (Fraction *) add: (Fraction *) f 64 //{ 65 //    Fraction *result = [[Fraction alloc] init]; 66 //     67 //   result.numerator = numerator * f.denominator + denominator * f.numerator; 68 //   result.denominator = denominator * f.denominator; 69 //     70 //    [result reduce]; 71 //    return result; 72 //} 73 // 74 //- (Fraction *) subtract: (Fraction *) f 75 //{ 76 //    Fraction *result = [[Fraction alloc] init]; 77 //     78 //    result.numerator = numerator *f.denominator - denominator *f.numerator; 79 //    result.denominator = denominator *f.denominator; 80 //     81 //    [result reduce]; 82 //    return  result; 83 //} 84 // 85 //- (Fraction *) multiply: (Fraction *) f 86 //{ 87 //    Fraction *result = [[Fraction alloc] init]; 88 //     89 //    result.numerator = numerator *f.numerator; 90 //    result.denominator = denominator *f.denominator; 91 //     92 //    [result reduce]; 93 //    return result; 94 //} 95 // 96 //- (Fraction *) divide: (Fraction *) f 97 //{ 98 //    Fraction *result = [[Fraction alloc] init]; 99 //    100 //    result.numerator = numerator *f.denominator;101 //    result.denominator = denominator *f.numerator;102 //    103 //    [result reduce];104 //    return result;105 //}106 107 - (void) reduce108 {109     int u = numerator;110     int v = denominator;111     int temp;112 113     while (v != 0) {114         temp = u % v;115         u = v;116         v = temp;117     }118     119     numerator /= u;120     denominator /= u;121 }122 123 - ( double) convertToNum124 {125     if (denominator != 0) {126         return (double) numerator / denominator;127     }else128         return NAN;129         130 }131 132 @end

 1 #import <Foundation/Foundation.h> 2  3 @interface Complex : NSObject 4  5 @property double real, imaginary; 6  7 - (void) print; 8  9 - (void) setReal: (double) a andImaginary: (double) b;10 11 //- (Complex *) add: (Complex *) f;12 - (id) addComp: (id) c;13 14 @end15 16 17 #import "Complex.h"18 19 @implementation Complex20 21 @synthesize real, imaginary;22 23 - (void) print24 {25     NSLog(@"%.1f + %.1fi", real, imaginary);26 }27 28 - (void) setReal: (double) a andImaginary: (double) b29 {30     real = a;31     imaginary = b;32 }33 34 //- (Complex *) add: (Complex *) f35 //{36 //    Complex *result = [[Complex alloc] init];37 //    38 //    result.real = real + f.real;39 //    result.imaginary = imaginary + f.imaginary;40 //    41 //    return result;42 //}43 44 - (id) addComp: (id) c45 {46     Complex *result = [[Complex alloc] init];47     48     result.real = real + [c real];49     result.imaginary = imaginary + [c imaginary];50     51     return result;52 }53 54 @end

 1 #import <Foundation/Foundation.h> 2 #import "Fraction.h" 3 #import "Complex.h" 4  5 int main(int argc, const char * argv[]) { 6     @autoreleasepool { 7  8         id dataValue1, dataValue2, result; 9         10         Fraction *f1 = [[Fraction alloc] init];11         Fraction *f2 = [[Fraction alloc] init];12         13         [f1 setTo: 1 over: 2];14         [f2 setTo: 1 over: 3];15         16         dataValue1 = f1;17         dataValue2 = f2;18         result = [dataValue1 addFrac:dataValue2];19         [result print];20         21 //------------------------------------------------------22         Complex *c1 = [[Complex alloc] init];23         Complex *c2 = [[Complex alloc] init];24         25         [c1 setReal:12 andImaginary: 3];26         [c2 setReal: 4 andImaginary: 5];27         28         dataValue1 = c1;29         dataValue2 = c2;30         result = [dataValue1 addComp:dataValue2];31         [result print];32 33         }34     return 0;35 }

 1         Fraction *fraction = [[Fraction alloc] init]; 2         Complex *complex = [[Complex alloc] init]; 3         id number = [[Complex alloc] init]; 4          5         if ( [fraction isMemberOfClass:[Complex class]] == YES ) { 6             NSLog(@"1"); 7         } 8         if ( [complex isMemberOfClass:[NSObject class]] == YES) { 9             NSLog(@"2");10         }11         if ( [complex isKindOfClass:[NSObject class]] == YES ) {12             NSLog(@"3");13         }14         if ( [fraction isKindOfClass:[fraction class]] == YES ) {15             NSLog(@"4");16         }17         if ([fraction respondsToSelector:@selector(print)] == YES ) {18             NSLog(@"5");19         }20         if ( [complex respondsToSelector:@selector(print)] == YES ) {21             NSLog(@"6");22         }23         if ( [Fraction instancesRespondToSelector:@selector(print)] == YES ) {24             NSLog(@"7");25         }26         if ( [number respondsToSelector:@selector(print)] == YES ) {27             NSLog(@"8");28         }29         if ( [number isKindOfClass:[Complex class]] == YES ) {30             NSLog(@"9");31         }32         if ( [[number class] respondsToSelector:@selector(alloc)]  == YES ) {33             NSLog(@"10");34         }35