Feb 3, 2012

K & R C Programs Exercise 6-1.

K and R C, Solution to Exercise 6-1:
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 write a routine that properly handles underscores, string constants, comments, or preprocessor control lines.Read more about C Programming Language .

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#include<stdio.h>
#include<ctype.h>
//getword: get next word or character from input
int getword(char *word, int lim)
{
 int c, d, comment(void), getch(void);
 void ungetch(int);
 char *w = word;
 while(isspace(c = getch()))
  ;
 if(c !=EOF)
  *w++ = c;
 if(isalpha(c) || c == '-' || c == '#'){
  for(; --lim > 0; w++)
   if(!isalnum(*w = getch()) && *w != '-') {
    ungetch(*w);
    break;
   }
 }
 else if(c == '\'' || c == '\\'){
  for( ; --lim > 0; w++)
   if(((*w = getch()) == '\\')
     *++w = getch();
   else if(*w == c) {
    w++;
    break;
   }else if(*w == EOF)
    break;
 }else if(c == '/')
  if((d = getch()) == '*')
   c = comment();
  else
   ungetch(d);
 *w = '\0';
 return c;
}

//comment: skip over comment and return a character
int comment()
{
 int c;
 while((c = getch()) != EOF)
  if(c == '*')
   if((c = getch()) == '/')
    break;
   else
    ungetch(c);
 return c;
}

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