OC--小练习

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// 给Car类设计一个方法，用来和其它车比较车速，如果本车>其它车，返回1，如果本车<其它车，返回-1，相等返回0

// 设计另外一个方法，返回两个车速之差

#import <Foundation/Foundation.h>

@interface Car : NSObject
{
    @public
    float _speed;
}

- (int)compare:(Car *)newCar;
- (float)compare2:(float)speed;

@end

@implementation Car

- (int)compare:(Car *)newCar{
    if(self->_speed > newCar->_speed){
        return 1;
    }else if(self->_speed < newCar->_speed){
        return -1;
    }else{
        return 0;
    }
}
- (float)compare2:(float)speed{
    return self->_speed - speed;
}

@end

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        
        Car *car1 = [Car new];
        Car *car2 = [Car new];
        car1->_speed = 120;
        car2->_speed = 160;
        int x = [car1 compare:car2];
        NSLog(@"\n%d", x);
        
        float y = [car1 compare2:160];
        NSLog(@"\n%.3f", y);
        
    }
    return 0;
}

OC--小练习

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原文地址：http://www.cnblogs.com/lianfu/p/5149979.html