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类接口文件(MathDiv.h)
#import <Foundation/Foundation.h> //Define the Fraction class @interface Fraction: NSObject { int dividend; int divider; } @property int dividend, divider; -(void) print; -(void) setTo:(int)n over:(int)d; -(double) convertToNum; @end
类实现文件(MathDiv.m)
#import "Fraction.h" @implementation Fraction @synthesize dividend, divider; -(void) print { NSLog (@"%i/%i", dividend, divider); } -(double) convertToNum { if (divider != 0) return (double)dividend/divider; else return 0.0; } -(void) setTo:(int)n over: (int)d { dividend = n; divider = d; } @end
主程序调用
#import "Fraction.h" int main(int argc, const char * argv[]) { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; Fraction *aFraction = [[Fraction alloc] init]; [aFraction setTo: 100 over: 200]; [aFraction print]; [aFraction setTo: 1 over: 3]; [aFraction print]; [aFraction release]; [pool drain]; return 0; }
运行结果: 100/200 1/3
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