Struct结构体定义和NSRange, NSPoint得使用

[b]结构体类型定义：[/b]

struct Date = {
    int year;
    int month;
    int day;
};
struct Date d = {2013,8,17};
d.day = 6;

或者

typedef struct Date = {
    int year;
    int month;
    int day;
} Date;
Date d = {2013, 9, 18};

[b]NSRange得使用[/b]

NSRange range = NSMakeRange(8, 10);
range.location
range.length

//转变成字符串打印出来
NSString *str = NSStringFromRange(8, 11);
NSLog(@"%@", str);

[b]NSPoint得使用[/b]

//x = 10, y = 9
NSPoint p = NSMakePoint(10,9);
NSString *str = NSStringFromPoint(p);
NSLog(@"%@", str);

[b]NSSize得使用[/b]

//NSSize包括width和height
NSSize s = NSMakeSize(100, 50);
NSString *str = NSStringFromSize(s);

[b]NSRect得使用[/b]

//NSRect包括origin和size
NSRect r = NSMakeRect(10,5, 100, 100);
NSString *str = NSStringFromRect(r);