Nov 15, 2011

K&R C Program Exercise 1-16

K and R solutions to Revise the the main routine of the longest-line program so it will correctly print the length of arbitrarily long input lines, and as much as possible of the text. 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 MAXINLINE 1000 /* maximum input line size */

int getline(char line[], int MAXINLINE);
void copy(char to[], char from[]);

/* print longest input line */
int main(void)
{
 int len;               /* current line length */
 int max;               /* maximum length seen so far */
 char line[MAXINLINE];    /* current input line */
 char longest[MAXINLINE]; /* longest line saved here */

 max = 0;

 while((len = getline(line, MAXINLINE)) > 0)
 {
  printf("%d: %s", len, line);

  if(len > max)
  {
   max = len;
   copy(longest, line);
  }
 }
 if(max > 0)
 {
  printf("Longest LINE IN THE PROGRAM is %d characters:\n%s", max, longest);
 }
 printf("\n");
 return 0;
}

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

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

/* copy: copy 'from' into 'to'; assume 'to' is big enough */
void copy(char to[], char from[])
{
 int k;

 k = 0;
 while((to[k] = from[k]) != '\0')
 {
  ++k;
 }
}


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