OC -- 练习1

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// 设计一个方法，用来和其他车比较车速，返回车速的差距

#import <Foundation/Foundation.h>

@interface Car : NSObject

@property (nonatomic, assign) int speed;

- (int)compare:(Car *)newCar;

@end

@implementation Car

- (int)compare:(Car *)newCar{

    return self.speed - newCar.speed;

}

@end

int main(int argc, const char * argv[]){

    Car *c1 = [[Car alloc] init];

    Car *c2 = [[Car alloc] init];

    c1.speed = 200;

    c2.speed = 150;

    int res = [c1 compare:c2];

    NSLog(@"res = %d", res);

    return 0;

}

OC -- 练习1

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原文地址：http://www.cnblogs.com/lianfu/p/4666023.html