typedef define

#define  PI  3.14
const float PI=3.14;

#define M (2+3)
 M*M  --> (2+3)*(2+3)

#define MAX(a,b)   ((a) > (b) ? (a) : (b))

int MAX(int a,int b)
{
 return a > b ? a : b;
}

 

#define INT float
INT i; ---> float i;

typedef int INT;
INT i ---> int i;

typedef struct student
{
 int id;
 char name[NAMESIZE];
 int math;
}STUDENT;

typedef struct student  STUDENT;
STUDENT stu ;   ---> struct student stu;

typedef struct student * STUP;
STUP p; ----> struct student *p;

//-----------------------------------
diff:typedef define

#define INTP int *
typedef int *INTP;

INTP p,q;---> int *p,q;
INTP p,q;---> int *p,*q;

//------------------------------------

typedef int ARR[3];----> int [3] -->ARR
ARR arr;--->  int [3] arr;--->int arr[3];

typedef int FUN(int);  --->int (int)  FUN;
FUN fun1,fun2;---> int fun1(int); int fun2(int);

typedef int (*FUNP)(int);  --->int (*)(int)  FUNP;
FUNP p;--->int (*p)(int);

 

void qsort(void *, size_t , size_t ,
         int(*compar)(const void *, const void *));
---->

typedef int(*compar)(const void *, const void *);
void qsort(void *, size_t,size_t, compar cmp);