Differentiate between macro and typedef?

Differences are:

1. • Typedef defines a new data type.
   • Macros can be of any type. Macros can even be any code block containing statements, loops, function calls etc.
2. • Syntax/Example of typedef:

     typedef unsigned short WORD;
     
     #define WORD unsigned short
     

   • Macros are expanded by the preprocessor before compilation takes place. Compiler will refer error messages in expanded macro to the line where the macro has been called.

     Code:
     
     Line:1:#define set_userid(x)\
     Line:2:current_user = x \
     Line:3:next_user = x + 1; 
     Line:4:int main (int argc, char *argv[])
     Line:5:{
     Line:6:  int user = 10;
     Line:7:  set_userid(user);
     Line:7:}
      
     main.c(7):error C2146: syntax error : missing ';' 
               before identifier 'next_user'
     
     Line 2 has the original compilation error
     

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