OC之【typedef的使用】

// #define Integer int
// 给基本数据类型起别名
void
typedef int
     
typedef Integer
     
    typedef  unsigned int UInteger;
     
int a = 10;
     
Integer b = 9;
     
UInteger c = 11;
     
MyInteger d = 89;
}
 
// 给指针类型起别名
void
char *s = "hello";
     
typedef char
     
String s1 = "hello";
}
 
void
     
     
    typedef  struct {
float
float
    } Point;
     
Point p = {10, 10};
}
 
void
    typedef  struct {
float
float
    } Point;
     
typedef Point
     
 //    typedef struct Point {
 //        float x;
 //        float y;
 //    } * PP;
     
Point point = {10.0f, 20.0f};
     
PP
     
printf("x=%f, y=%f\n", pp->x, pp->y);
}
 
void
    typedef  enum {
        spring,
        summer,
        autumn,
        winter
    } Season;
     
Season s = spring;
}
 
int sum(int a, int
int
printf("%d+%d=%d\n", a, b, c);
return
}
 
// 给指向函数的指针定义一个别名SumPoint
void
typedef int (*SumPoint)(int, int);
     
SumPoint p = sum;
     
4, 5);
}
 
void
typedef char
    #define String2 char *
     
String1
 //    String1 s1;
 //    String1 s2;
     
String2
 //    char *s3, s4;
 //    char *s3;
 //    char s4;
}
 
int main(int argc, const char
{
     
int
     
 //    int a;
 //    int b;
     
return 0;
}