Nov 15, 2011

K & R C Exercise 1-18

K and R C, Solution to Exercise 1-18:
Remove trailing blanks and tabs from each line of input, and to delete entirely blank lines. K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language, second addition, by Brian W.Keringhan and Dennis M.Ritchie(Prentice Hall,1988). You can learn and solve K&R C Programs Exercise. Read more about C Programming Language .



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#include "stdio.h"

#define MAXLINE 1000

int get_lines(char line[], int maxline);
int char remove(char str[]);

main()
{

 char line[MAXINLINE];/* current input line */

 while((get_lines(line,MAXINLINE))>0)
  if(remove(line)> 0)
   printf("%s", line);
 return 0;

}
/*
 remove trailing blanks and tabs from character string str
 */
int remove(char str[])
{
 int i=0;
 while(str[i] !='\n')
  ++i;

 --i;

 while(i>=0 && (str[i]==' ' || str[i]=='\t'))
  --i;
 if(i>=0)
 {
  ++i;
  s[i]='\n';
  ++i;
  s[i]='\0';

 }
 return i;
}
/* getline: read a line into str, return length */
int get_lines(char str[], int line)
{
 int c, i, j;

 for(i = 0, j = 0; (c = getchar())!=EOF && c != '\n'; ++i)
 {
  if(i < line - 1)
  {
   str[j++] = c;
  }
 }
 if(c == '\n')
 {
  if(i <= line - 1)
  {
   str[j++] = c;
  }
  ++i;
 }
 str[j] = '\0';
 return i;
}

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