第1题:对象的操作、对象作为函数参数
#import <Foundation/Foundation.h>
@interface Person : NSObject
{
@public
int age;//60
double height;//1.9
}
- (void)print;
@end
void test1(int newAge, double newHeight);
void test2(Person *newP);
void test3(Person *newP);
void test4(Person *newP);
int main()
{
Person *p = [Person new];
p->age = 10;
p->height = 1.5f;
test1(p->age, p->height);
[p print];// 10, 1.5
test2(p);
[p print];//20, 1.7
test3(p);
[p print];//20, 1.7
test4(p);
[p print];//60, 1.9
return 0;
}
@implementation Person
- (void)print
{
NSLog(@"年龄=%d,身高=%f", age, height);
}
@end
void test1(int newAge, double newHeight)
{
newAge = 10;
newHeight = 1.6;
}
void test2(Person *newP)// Person *newP = p
{
newP->age = 20;
newP->height = 1.7;
}
void test3(Person *newP)// Person *newP = p
{
Person *p2 = [Person new];
p2->age = 40;
p2->height = 1.8;
newP = p2;
newP->age = 30;
}
void test4(Person *newP)// Person *newP = p
{
Person *p2 = newP;// p2 = newp = p
p2->age = 50;
p2->height = 1.9;
newP->age = 60;
}
第2题:匿名对象
#import <Foundation/Foundation.h>
@interface Person : NSObject
{
@public
int age;
double height;
}
- (void)print;
@end
@implementation Person
- (void)print
{
NSLog(@"年龄=%d,身高=%f", age, height);
}
@end
int main()
{
[Person new]->age = 10;
[Person new]->height = 1.8;
[[Person new] print];
return 0;
}
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