C Programming : Tricks of Typedefs and Macros

 (1)typedef has a strict type checking whereas macros are just copy-paste.


 typedef  int *  int_ptr;
          OR
 #define int_ptr  int *


 int a=0,b=0;

 int_ptr k1,k2;
 // In case of #define int * k1,k2; where k1 is a pointer to integer, k2 is integer.
 // In case of typedef both are  pointer to integer.
 k1 = &a; k2=&b;


(2) typedef cannot be applied with other types whereas macros can as they are blind copy-paste

typedef int integer;
     OR
#define integer int

unsigned integer k = 0;
//works fine for macros but illegal in C when typedef is used for integer.