pragma mark 练习2
pragma mark 概念
pragma mark 代码
#import <Foundation/Foundation.h>
#pragma mark 类
#pragma mark main函数
@interface Person : NSObject
{
@public
int age;
double height;
}
- (void)print;
@end
// int newAge = 10 , double newHeight = 1.5f
void test1(int newAge, double newHeight);
void test2(Person *newP);
void test3(Person *newP);
void test4(Person *newP);
int main(int argc, const char * argv[])
{
Person *p = [Person new];
p-> age = 10;
p-> height = 1.5f;
test1(p->age, p->height);
[p print]; // 10.1.5
test2(p); // 指针 地址
[p print]; // 20 1.7
test3(p); // 指针 地址
[p print];
test4(p); // 指针 地址
[p print];
return 0;
}
@implementation Person
-(void)print
{
NSLog(@"年龄=%d,身高=%f",age,height);
}
@end
void test1(int newAge, double newHeight)
{
newAge = 24;
newHeight = 1.72;
}
// person *newP = p;
void test2(Person *newP)
{
newP->age = 20;
newP->height = 1.70;
}
void test3(Person *newP)
{
Person *p2 = [Person new];
p2->age = 40;
p2->height = 1.8;
newP = p2; // 把 p2的地址 赋值给 newP 只是地址改变 相当于改变了指向
newP->age = 22;
}
void test4(Person *newP)
{
Person *p2 = newP;
p2->age = 50;
p2->height = 1.8;
newP->age = 60;
}
//@end
