函数多参数的几种用法

使用 参数名，例如：'over',这里 'over'可以换成其他的单词。

1.#import <Foundation/Foundation.h>
2.
3.@interface Animal: NSObject
4.
5.@property int Speed, Legs;
6.
7.-(void) display;
8.
9.-(void) set_speed:(int) speed over:(int) legs ;
10.
11.@end
12.
13.@implementation Animal
14.
15.@synthesize Speed,Legs;
16.
17.-(void) display
18.{
19. NSLog(@"run speed %i",Speed);
20.    NSLog(@"I have %i legs",Legs);
21.}
22.
23.-(void) set_speed:(int) speed over: (int) legs
24.{
25.    Speed = speed;
26.    Legs  = legs;
27.}
28.@end
29.
30.
31.int main(int argc, const char * argv[])
32.{
33.
34.    @autoreleasepool {
35.        Animal *dog;
36.       
37.        dog = [Animal alloc];
38.        dog = [dog init];
39.       
40.       
41.        [dog set_speed:30 over: 4];
42.        [dog display];
43.        // insert code here...
44.        NSLog(@"Hello, World!");
45.       
46.    }
47.    return 0;
48.}

不使用 参数名:

1.#import <Foundation/Foundation.h>
2.
3.@interface Animal: NSObject
4.
5.@property int Speed, Legs;
6.
7.-(void) display;
8.
9.-(void) set_speed:(int) speed :(int) legs ;
10.
11.@end
12.
13.@implementation Animal
14.
15.@synthesize Speed,Legs;
16.
17.-(void) display
18.{
19. NSLog(@"run speed %i",Speed);
20.    NSLog(@"I have %i legs",Legs);
21.}
22.
23.-(void) set_speed:(int) speed : (int) legs
24.{
25.    Speed = speed;
26.    Legs  = legs;
27.}
28.@end
29.
30.
31.int main(int argc, const char * argv[])
32.{
33.
34.    @autoreleasepool {
35.        Animal *dog;
36.       
37.        dog = [Animal alloc];
38.        dog = [dog init];
39.       
40.       
41.        [dog set_speed:30 : 4];
42.        [dog display];
43.        // insert code here...
44.        NSLog(@"Hello, World!");
45.       
46.    }
47.    return 0;
48.}