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   }
  24   if (max > 0)
  25     printf("Longest is %d chars:\n%s", max, longest);
  26
  27   printf("\n");
  28   return 0;
  29 }
  30
  31 /* getline: read a line into s, return length */
  32 int getline(char s[], int lim)
  33 {
  34   int c, i, j;
  35
  36   for (i = 0, j = 0;  i<lim-1 && (c = getchar()) != EOF && c!='\n'; ++i)
  37   {
  38     if(i < lim - 1)
  39     {
  40       s[j++] = c;
  41     }
  42   }
  43   if(c == '\n')
  44   {
  45     if(i <- lim - 1)
  46     {
  47       s[j++] = c;
  48     }
  49     ++i;
  50   }
  51   s[j] = '\0';
  52   return i;
  53 }
  54
  55 /* copy: copy 'from' into 'to'; assume to is big enough */
  56 void copy(char to[], char from[])
  57 {
  58   int i;
  59   i = 0;
  60   while ((to[i] = from[i]) != '\0')
  61     ++i;
  62 }
  63