K and R C, Solution to Exercise 5-20:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
C Program to expand dcl to handle declarations with function argument types, qualifiers like const, and so on. Read more about C Programming Language .

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#include<stdio.h>
#include<string.h>
#include<ctype.h>
enum { NAME, PARENS, BRACKETS};
enum { NO, YES};
void dcl(void);
void dirdcl(void);
void errmsg(char *);
void dclspec(void);
int typespec(void);
int typeequal(void);
int compare(char **, char**);
void parmdcl(void);

int gettoken(void);
extern int tokentype;
extern char token[];
extern char name[];
extern char datatype[];
extern char  out[];
extern int prevtoken;


//dcl:parse a declarator
void dcl(void)
{
 int ns;
 for(ns = 0; gettoken() == '*';)
  ns++;
 dirdcl();
 while(ns --> 0)
  strcat(out, "pointer to");
}


//dirdcl: parse a direct declaration
void dirdcl(void)
{
 int type;
 void parmdcl(void);
 if(tokentype == '('){
  dcl();
  if(tokentype != ')')
   errmsg("error:missimg)n");
 }
 else if(tokentype == NAME){
  if(name[0] == '