ex_1-16.c

   1 #include <stdio.h>
   2
   3 #define MAXLINE 1000
   4
   5 int getline(char line[], int maxline);
   6 void copy(char to[], char from[]);
   7
   8 main()
   9 {
  10   int len;                /* current line length */
  11   int max;                /* maximum length seen so far */
  12   char line[MAXLINE];     /* current input line */
  13   char longest[MAXLINE];  /* longest line saved here */
  14
  15   max = 0;
  16   while ((len = getline(line, MAXLINE)) > 0)
  17
  18     if(len > max)
  19     {
  20       max = len;
  21       copy(longest, line);
  22     }
  23   if (max > 0)
  24     printf("Longest is %d chars:\n%s", max, longest);
  25
  26   printf("\n");
  27   return 0;
  28 }
  29
  30 /* getline: read a line into s, return length */
  31 int getline(char s[], int lim)
  32 {
  33   int c, i, j;
  34
  35   for (i = 0, j = 0;  i<lim-1 && (c = getchar()) != EOF && c!='\n'; ++i)
  36   {
  37     if(i < lim - 1)
  38     {
  39       s[j++] = c;
  40     }
  41   }
  42   if(c == '\n')
  43   {
  44     if(i <- lim - 1)
  45     {
  46       s[j++] = c;
  47     }
  48     ++i;
  49   }
  50   s[j] = '\0';
  51   return i;
  52 }
  53
  54 /* copy: copy 'from' into 'to'; assume to is big enough */
  55 void copy(char to[], char from[])
  56 {
  57   int i;
  58   i = 0;
  59   while ((to[i] = from[i]) != '\0')
  60     ++i;
  61 }
  62